KR102553567B1 - Indoor maps using floor plans based on actual measurements and methods for creating them - Google Patents

Abstract

Provided is a method for creating an indoor map of any one floor of a building using a GPS receiver and CAD software. The method comprises the steps of: preparing a CAD drawing including a plan view of any one floor of a building in a local coordinate system having a unit of distance; setting a reference point and a reference line which are relatively fixed to the building; determining a coordinate of the reference point and a direction of the reference line in a planar rectangular coordinate system by using a GPS receiver; converting the local coordinate system of the CAD drawing into the planar rectangular coordinate system by using the determined coordinate of the reference point and the determined direction of the reference line; and converting the coordinates on the plan view from the coordinate of the planar rectangular coordinate system into a coordinate of a geographic coordinate system.

Description

Indoor map using floor plan based on actual measurements and its creation method

The present invention provides an indoor map using a floor plan based on actual measurements and a method for creating the same.

In the past, maps printed as a single sheet on a large sheet of paper or divided into regions and printed as a book were essential for travel. But now, as computers and smartphones have become popular, digital maps have taken their place. The biggest advantage of a digital map is that it can move the center of the screen to the place we are interested in (translate, move), enlarge it to the required magnification (zoom-in/zoom-out), and compare it with the actual landscape seen in front of us. To do this, you can change the direction of the map (rotate) will be the point. The basic concept for implementing convenient functions that were not available in paper maps like this is a view.

If a complete map of Korea or a world map is the entire map, a part of the map displayed on the screen of a computer or smartphone, or the map You can think of an object that is visible as a view. OpenLayers, a representative client-side open source software related to maps, defines a view as follows (source: https://openlayers.org/en/latest/ apidoc/module-ol_View-View.html).

A view object represents a simple two-dimensional view of a map. You can apply map center, resolution, and rotation operations to this object. A view has a projection method. This projection determines the center of coordinates, and the units of this view determine the units of resolution. The default projection is spherical Mercator (EPSG:3857). (A View object represents a simple 2D view of the map. This is the object to act upon to change the center, resolution, and rotation of the map. A View has a The projection determines the coordinate system of the center, and its units determine the units of the resolution (projection units per pixel).The default projection is Spherical Mercator (EPSG:3857).)

Other maps such as Google map, BingMap, OpenStreetMap, Naver Map, and Kakao Map all use the same concept. Thus, you can think of a view as an unofficial but common concept used by virtually all digital maps.

Digital maps accessed through the Internet differ in what is displayed on the view depending on the zoom level of the map. The zoom level of a typical map can vary from 0 to 24 degrees. At zoom level 0, the entire world is visible. Figure 1 shows a map tile along with an outdoor map around Korea in OpenLayers, and the source of the map data is OpenStreetMap (https://www.openstreetmap.org) . A single map tile is generally created as a PNG (Portable Network Graphics) file with both width and height of 256 pixels.

Looking at Figure 1, it can be seen that all of South Korea is included in one map tile (z:5, x:27, y:12) at zoom level 5. In this tile, you can see the boundaries of each province, and you can see that large cities such as Seoul, Gwangju, and Busan are marked. On the other hand, Fig. 2 is a view of the same area at zoom level 6. The area shown in one tile is divided into a total of 4 tiles, 2 each horizontally and vertically, and since the total area is increased, small cities and highways are additionally displayed. In this way, when the zoom level increases by 1, the area shown on one tile is reduced to 1/4, and the map is shown enlarged by 4 times.

When you start a digital map, tiles matching your geographic location and zoom level are fetched from the map server and displayed in the view. Therefore, for example, the same tiles are shown until the zoom level starts from 5.0 to 6.0, and only the tiles are enlarged or reduced according to the zoom level of the digital map. On the other hand, when the zoom level exceeds 6.0, a different tile set is used, so in principle, a different image can be displayed.

To create a tile used in a digital map, first define all the features to be included in the map, such as roads, buildings, and railroads, as layers, and then determine the order in which each layer is overlapped. define. 3 is a conceptual diagram illustrating a process of dividing the real world into layers in map production (source: https://saylordotorg.github.io/text_essentials-of-geographic-information-systems/s11-02-multiple- layer-analysis.html). In describing the real world as a map, you can see that land usage status, elevation, parcels, and streets are built into separate layers.

Software such as AutoCAD, Photoshop, and Adobe Illustrator, which are widely known to people, all use layers to create or modify drawings, photos, and illustrations. Even earlier, the concept of layers was used to create cel animations.

Cell animation is a production technique that creates a cartoon movie. It is a technology in which the background and characters are drawn on a separate transparent film called celluloid, and then the films are overlapped and filmed with a camera to complete frame by frame. Using this technique, layers that do not change from frame to frame can be repeatedly used, saving time and effort.

Assume that each layer in FIG. 3 is made of a transparent film and then overlapped in order to take a picture. If you poke small holes in all layers by poking the overlapping layers from above with an awl, the holes in all layers will have the same geographical location in the real world, for example, the same latitude and longitude. will be.

As an actual example, the 2020 version of Baro e Map (map.ngii.go.kr), the official national map produced by the National Geographic Information Institute (https://www.ngii.go.kr), has a total of 193 layers. Consists of. Using software such as QGIS, an open source software for map production, each layer can be modified separately and then all layers can be merged and output as a single map.

This single map can be created as a picture file with an extension such as jpeg, png, or tiff, that is, a raster map, or a vector map such as a floor plan of a building created with AutoCAD. . 193 layers were used in the production process of the Baro e-map, but the completed raster map becomes a single layer.

Using software such as QGIS, OpenLayers or Leaflet, each person can create maps specific to their needs. In this case, more than one layer can be used again. For example, after loading a satellite image, faintly visible roads in the satellite image can be drawn as a vector layer, and these two layers can be overlapped. In this case, it could be used to plan a hike by emphasizing the road in a real landscape as seen from the sky.

A zoom level shown on the digital map may be defined for each layer as shown in FIG. 3 . For example, highways are defined to be visible at any zoom level from 6 to 24, and local roads are defined to be visible only when the zoom level is 7 or higher. After defining the zoom level for each layer in this way, tiles to be used in the digital map are created from these layers as if creating a cell animation. Therefore, different information can be shown when swapping to different tile sets depending on the zoom level.

Figure 4 shows the neighborhood of Daejeon Jungang-ro Intersection in Baro e Map. When the zoom of the map is small, only the central car center is shown to the northeast of Jungangno Station. However, as the zoom of the map increases in FIG. 5, outlines of a number of buildings including Hansol Pharmacy are shown.

As in FIG. 4, when the zoom level is small, virtually nothing can be recognized if all such information is displayed. Therefore, as the zoom of the map increases, a method for displaying more and more detailed information is indispensable.

On the other hand, due to rapid urbanization, most of the world's population lives in cities, and many buildings are multi-story buildings with two or more floors. Therefore, if you want to display complete information of a particular building on an online map, an indoor map that shows the structure and information of a particular floor when the user selects it is essential. An indoor map is basically an optional display of additional information on a floor plan of a building.

Google started providing digital map services running on the web in February 2005, and indoor map services in March 2011, and now many companies are providing various types of indoor map services ^. If you search for 'Google Indoor Maps' in Google Chrome, you can find a page introducing Google's indoor map service (https://www.google.com/intl/en/maps/about/partners/indoormaps). , shows Madison Square Garden in New York, USA as an example of an indoor map. If you click the link marked 'View on Google Maps' here, the screen shown in Figure 6 is displayed (Source: https://www.google.com/maps/place/%EB%A7%A4%EB%94%94 %EC%8A%A8+%EC%8A%A4%ED%80%98%EC%96%B4+%EA%B0%80%EB%93%A0/@40.7505029,-73.9936424,19z/data=!3m1! 5s0x89c259ae1546fb27:0x93ba42deb43c8368!4m12!1m6!3m5!1s0x89c25a21fb011c85:0x33df10e49762f8e4!2z66ek65SU7IqoIOyKpO2AmOyWtCDqsIDrk6A !8m2!3d40.7505045!4d-73.9934387!3m4!1s0x89c25a21fb011c85:0x33df10e49762f8e4!8m2!3d40.7505045!4d-73.9934387).

As shown in FIG. 6, an indoor map is overlapped and displayed at the correct position on the outdoor map, and a 6K floor is shown on the introduction screen. In addition, the mini home page of Madison Square Garden is shown on the left side of the screen, and there is a menu to select other floors on the right side.

In FIG. 7, the map screen is enlarged to show the east side of Madison Square Garden, and in FIG. 8, the floor is changed to the second basement floor (-2). If you select a different floor like this, the plan view of that floor is replaced and displayed.

For outdoor maps, tiles to be displayed on the map are automatically determined when the geographic location and zoom level to be displayed on the view are determined. As described above, in most cases, square raster files produced in the form of png files are used for tiles, but these days, map service providers using vector tiles are also increasing. However, the indoor map must be overlapped on the outdoor map, and when the user selects another floor, another indoor map, that is, a floor plan of another floor, must be displayed, so it is difficult to provide a service in the same tiled manner as the outdoor map. Therefore, the indoor map should be managed as separate data from the outdoor map, stored in a data store, and then retrieved when necessary and displayed superimposed on the outdoor map.

In this way, in order to be stored in a data storage and provided to a web server, it is desirable to create an indoor map as a text-based vector file, and the most suitable file format for this is GeoJSON. According to the official website (https://geojson.org), GeoJSON is a format for encoding a variety of geographic data structures.

According to the Korean Wikipedia site, "GeoJSON is an open and open standard format designed to systematically represent terrain based on points with location information. This is a file format that uses JSON, JavaScript Object Notation. ." It is explained as ^{non-special 2} .

Since GeoJason is a JavaScript object, understanding of JavaScript objects should precede understanding of GeoJason. MDN Web Docs describes JavaScript objects as follows (source: https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Object).

An object class represents one of JavaScript's data types. It is used to store collections of values with various keys and more complex entities. Objects can be created using the Object() constructor or object initializer / literal syntax. Object() constructor or the object initializer / literal syntax.)

To create a JavaScript object, put a property consisting of a pair of 'key: value' inside curly braces ({}), and a string type is allowed for the key, and all data types are allowed for the value. For example, a user-defined object called coordinate can be defined as:

var coordinate = { lat: 36.0, lon: 127.0 };

Here, lat and lon are keys, and 36.0 and 127.0 are values. For example, the value of lat can be obtained as coordinate.lat.

The latest official document on GeoJSON is "RFC (Request for Comments) 7946 - The GeoJSON Format" published in 2016 by ^the International Internet Engineering Task Force Working Group. According to this, the types of objects that GeoJason allows are Geometry, Property Objects, and Property Group Objects.

GeoJason supports the following types of geometric objects: Point, line segment, line string, polygon, multi point, multi line segment, multi line string, multi polygon多角形, MultiPolygon), and GeometryCollection. A feature object is an object that has additional properties added to a geometric object. And a property group object (FeatureCollection) is an object that has multiple property objects. (GeoJSON supports the following geometry types: Point, LineString, Polygon, MultiPoint, MultiLineString, MultiPolygon, and GeometryCollection. Features in GeoJSON contain a Geometry object and additional properties, and a FeatureCollection contains a list of Features.)

A GeoJSON object is one of JSON (JavaScript Object Notation) objects, and has a type item (member), and the value of the item must be one of the nine items listed above. In other words, the GeoJSON object is obtained by adding a property object and a property group object to the geometry object. Also, it can have foreign members.

3. GeoJason object

GeoJason objects refer to geometry objects, property objects, and property group objects.

o A geoJason object is a JASON object.

o A GeoJason object has an item named type. The value of that item must be one of the types of GeoJason objects.

o A GeoJason object can have a "bbox" item, and the value of that item must be a minimum bounding box array.

o GeoJason objects can have other items.

(3. GeoJSON Object

A GeoJSON object represents a Geometry, Feature, or collection of Features.

o A GeoJSON object is a JSON object.

o A GeoJSON object has a member with the name "type". The value of the member MUST be one of the GeoJSON types.

o A GeoJSON object MAY have a "bbox" member, the value of which MUST be a bounding box array.

o A GeoJSON object MAY have other members.)

A Geometry object represents points, curves, and surfaces in coordinate space. The value of a Geometry object's "type" member MUST be one of the seven geometry types. That is, the type of geometry object must have one of "Point", "LineString", "Polygon", "MultiPoint", "MultiLineString", "MultiPolygon", and "GeometryCollection" as a value.

A GeoJSON Geometry object of any type other than "GeometryCollection" has a member with the name "coordinates". The value of the "coordinates" member is an array.

Position is a fundamental geometric component of a geometric object. A point object consists of only one position, and a connecting line segment object is given as an array of positions.

3.1.1. location

Position is a fundamental geometric component. The coordinate properties of a geometry object consist of:

o For a point object, one position,

o an array of positions in the case of a connecting line segment object or multipoint object;

o In the case of multi-connected line segment objects or polygonal objects, arrangement of connected line segment objects or annular arrangement of coordinates,

or

o In the case of a multi-polygon object, an array of polygon object coordinates.

(3.1.1. Position

A position is the fundamental geometry construct. The "coordinates" member of a Geometry object is composed of either:

o one position in the case of a Point geometry;

o an array of positions in the case of a LineString or MultiPoint geometry.

o an array of LineString or linear ring coordinates in the case of a Polygon or MultiLineString geometry,

or

o an array of Polygon coordinates in the case of a MultiPolygon geometry.)

A location is an array of longitude and geodetic latitude, or easting and northing distances, with an optional third element, altitude (elevation). .

position is an array of numbers. There must be two or more elements. The first two elements must be longitude and latitude, or distance east and north, in that exact order, and numbers given in decimal notation. A position is an array of numbers. There MUST be two or more elements. The first two elements are longitude and latitude, or easting and northing , precisely in that order and using decimal numbers. Altitude or elevation MAY be included as an optional third element).

As you can see from the above, the simplest GeoJason object is a point object. If the value of longitude is lon and the value of latitude is lat, the point object is given as follows.

{"type": "Point", "coordinates": [lon, lat]}

Here, we can see that the location is given as an array [lon, lat] of longitude lon and latitude lat. Arrays in JavaScript are denoted by square brackets ([]). Also, if the altitude is alt, the point object including the altitude is given as follows.

{"type": "Point", "coordinates": [lon, lat, alt]}

A connecting segment object requires at least two locations. The connecting line segment object connecting the position of (100.0°, 0.0°) to (101.0°, 1.0°) of longitude and latitude is given as follows.

{"type": "LineString", "coordinates": [[100.0, 0.0], [101.0,1.0]]}

If you change the type here to MultiPoint, it becomes two points instead of a connecting line.

Also, three points are needed to mathematically define a triangle. The difference between expressing a triangle as a connecting line segment object and a polygon object is whether the inside and outside of the triangle can be distinguished. Even if the triangle looks the same, in the case of a connecting line segment object, it is only three line segments, and it is impossible to color the triangle because the inside and outside cannot be distinguished. On the other hand, since polygon objects can distinguish between inside and outside, triangles can be colored, and whether the mouse cursor is inside or outside the triangle can also be determined.

Both the connecting line segment object and the polygon object are given as an array of positions. However, GeoJason requires two essential conditions to define a polygon object. First, the first position and the last position in the position array given as the value of the coordinate item must be the same. Second, the order of positions must be given in a counterclockwise direction when viewed in coordinate space.

3.1.6. polygon object

To understand constraints that apply only to polygonal objects, it is useful to introduce the concept of a linear ring:

o A linear ring is a closed connecting line segment object with 4 or more positions.

o The first and last positions must be the same, and both the value and format must be the same.

o A linear ring represents the boundary of the surface or the boundary of a hole drilled in the surface.

o The linear ring must follow the right-hand rule with respect to the boundaries of the area represented by the linear ring. That is, the outer linear ring is counterclockwise, and the hole is clockwise.

(3.1.6. Polygon

To specify a constraint specific to Polygons, it is useful to introduce the concept of a linear ring:

o A linear ring is a closed LineString with four or more positions.

o The first and last positions are equivalent, and they MUST contain identical values; their representation SHOULD also be identical.

o A linear ring is the boundary of a surface or the boundary of a hole in a surface.

o A linear ring MUST follow the right-hand rule with respect to the area it bounds, i.e., exterior rings are counterclockwise, and holes are clockwise.)

If a polygon object has more than one linear ring, the first linear ring should represent the outermost boundary and the others represent the inner holes.

o Coordinates of a polygon object must be given as an array of coordinates of a linear ring.

o For a polygon object with more than one linear ring, the first linear ring must be the outermost linear ring, and the rest are inner linear rings. The outermost linear rings represent the boundary of the surface, and the inner linear rings, if present, represent the boundaries of the hole.

(o For type "Polygon", the "coordinates" member MUST be an array of linear ring coordinate arrays.

o For Polygons with more than one of these rings, the first MUST be the exterior ring, and any others MUST be interior rings. The exterior ring bounds the surface, and the interior rings (if present) bound holes within the surface.)

A GeometryCollection is a GeoJason object that has a geometry object as the value of an item named "geometries".

3.1.8. geometry group object

A GeoJason object with a type of "GeogroupObject" is a Geometry object. The GeoGroup object has an item named "geoms". The value of "geoms" is an array. Each element of this array is a GeoJason geometry object. An empty array with no values is allowed.

(3.1.8. GeometryCollection

A GeoJSON object with type "GeometryCollection" is a Geometry object. A GeometryCollection has a member with the name "geometries". The value of "geometries" is an array. Each element of this array is a GeoJSON Geometry object. It is possible for this array to be empty.)

Meanwhile, as described above, the property object is an object having a property member in addition to the geometry object. The property object can have an id item and an external item defined by the user. An example of a property object is as follows.

{

"type": "Feature",

"id": "f1",

"geometry": {...},

"properties": {...},

"title": "Example Feature"

}

Here, an item whose key is "title" and whose value is "Example Feature" is an external item. However, the information contained in this external item can be moved to the properties member as follows.

{

"type": "Feature",

"id": "f1",

"geometry": {...},

"properties": {

"title": "Example Feature",

...

}

}

Although not defined in the official documentation, a property object derived from a point object could be called a point feature object, and other geometric objects could be called the corresponding property objects as well. . On the other hand, the property group object is a GeoJason object that has a number of property objects (Features) as in the following example.

{

"type": "FeatureCollection",

"features": [{

"type": "Feature",

"geometry": {

"type": "Point",

"coordinates": [102.0, 0.5]

},

"properties": {

"prop0": "value0"

}

},

{

"type": "Feature",

"geometry": {

"type": "LineString",

"coordinates": [

[102.0, 0.0],

[103.0, 1.0],

[104.0, 0.0],

[105.0, 1.0]

]

},

"properties": {

"prop0": "value0",

"prop1": 0.0

}

},

{

"type": "Feature",

"geometry": {

"type": "Polygon",

"coordinates": [

[

[100.0, 0.0],

[101.0, 0.0],

[101.0, 1.0],

[100.0, 1.0],

[100.0, 0.0]

]

]

},

"properties": {

"prop0": "value0",

"prop1": {

"this": "that"

}

}

}]

}

In this example, the attribute group object is an object that has one point attribute object, one connection line segment attribute object, and one polygon attribute object.

9 is a slightly modified example of OpenLayers (source: https://openlayers.org/en/latest/examples/geojson.html) in which polygons, points, and line segments are created with GeoJSON and superimposed on an outdoor map. The source code is as follows.

<!doctype html>

<html>

<head>

<meta charset="utf-8">

<link rel="stylesheet" href="ol.css">

<style>

.map {

position: absolute;

top: 0;

bottom: 0;

left: 0;

right: 0;

font-family: Arial, sans-serif;

}

</style>

</head>

<body>

<div id="map" class="map"></div>

<script src="ol.js"></script>

<script>

const styles = {

'Point': new ol.style.Style({

image: new ol.style.Circle({

radius: 5,

fill: null,

stroke: new ol.style.Stroke({color: 'red', width: 1}),

})

}),

'LineString': new ol.style.Style({

stroke: new ol.style.Stroke({

color: 'green',

width: 1;

}),

}),

'Polygon': new ol.style.Style({

stroke: new ol.style.Stroke({

color: 'blue',

lineDash: [4],

width: 3;

}),

fill: new ol.style.Fill({

color: 'rgba(0, 0, 255, 0.1)',

}),

}),

};

const styleFunction = function (feature) {

return styles[feature.getGeometry().getType()];

};

const geojsonObject = {

'type': 'FeatureCollection',

'crs': {

'type': 'name',

'properties': {

'name': 'EPSG:3857',

},

},

'features': [

{

'type': 'Feature',

'geometry': {

'type': 'Point',

'coordinates': [0, 0],

},

},

{

'type': 'Feature',

'geometry': {

'type': 'LineString',

'coordinates': [

[4e6, -2e6],

[8e6, 2e6],

],

},

},

{

'type': 'Feature',

'geometry': {

'type': 'LineString',

'coordinates': [

[4e6, 2e6],

[8e6, -2e6],

],

},

},

{

'type': 'Feature',

'geometry': {

'type': 'Polygon',

'coordinates': [

[

[-5e6, -1e6],

[-3e6, -1e6],

[-4e6, 1e6],

[-5e6, -1e6],

],

],

},

},

],

};

const vectorSource = new ol.source.Vector({

features: new ol.format.GeoJSON().readFeatures(geojsonObject),

});

var map = new ol. Map({

view: new ol. View({

center: [0, 0],

Zoom: 2

}),

layers: [

new ol. layer. Tile({

source: new ol.source.OSM()

}),

new ol. layer. Vector({

source: vectorSource,

style: styleFunction

})

],

target: 'map'

});

</script>

</body>

</html>

Create a document like this in notepad, save it as index.html, and save the ol.css and ol.js files included in the OpenLayers library in the same folder as the index file (index.html) ( folder) and open the index file with Chrome or Edge browser, you can see the map screen as shown in FIG. 9.

As can be seen here, in FIG. 9, an attribute group object having one point attribute object, two connection line segment attribute objects, and one polygon attribute object is superimposed on the world map, and the position of each point and the nodal point of the connecting line segment are superimposed on the world map. The positions of the polygons and the vertices of the polygons were expressed as eastward and northward distances in the Web Mercator projection method (EPSG: 3857), which is the same as the projection method of the digital map. Eastward and northward distances in the Web Mercator projection method can be converted to and from longitude and geodetic latitude, respectively.

In addition, there is a constant called styles, which predefines how to render a Point object, a LineString object, and a Polygon object on a map. For example, the polygon object element of the style constant is defined as follows.

'Polygon': new ol.style.Style({

stroke: new ol.style.Stroke({

color: 'blue',

lineDash: [4],

width: 3;

}),

fill: new ol.style.Fill({

color: 'rgba(0, 0, 255, 0.1)',

}),

})

This draws the polygon's line with a thickness of 3 points (width: 3), blue (color: 'blue') dashed line (lineDash: [4]), and the surface is blue (fill: new ol.style. It means to fill with Fill({color: 'rgba(0, 0, 255, 0.1)'})).

In addition, the following style function (styleFunction) is defined.

const styleFunction = function (feature) {

return styles[feature.getGeometry().getType()];

};

This function first obtains a geometry object for a given feature object (getGeometry()), obtains the type of the geometry object from it (getType()), and returns a style corresponding to that type (return styles[] ) means

Point objects, connecting line segment objects, and polygon objects were expressed in a predetermined style using such a function. Without this function, these shapes would simply be drawn as solid black and white lines.

Using this method, an indoor map can be created in GeoJSON format and displayed overlaid on an outdoor map. When the outdoor map is moved or enlarged/reduced/rotated, the indoor map is also enlarged/reduced/rotated. In addition, it is also possible to dynamically remove a floor plan in GeoJSON format and replace it with another floor plan.

[Special 1] to [Special 2] disclose a new coordinate system developed for use in digital maps. This coordinate system replaces geodetic latitude and longitude, which are used to specify a geographic location, with a unit of distance called northing. and easting distance (東向距離, easting) are used.

The latitude used in a smartphone or car navigation system is different from the latitude learned in elementary school. Since the latitude taught in textbooks explains latitude and longitude assuming that the shape of the earth is a perfect sphere, the latitude that exists in our common sense is actually geocentric latitude. However, the latitude used in maps and GPS systems is called geodetic latitude.

Geodetic latitude is the rotation of the Earth due to the rotation of the Earth on its axis. ), which reflects the fact that This Earth ellipsoid is used as a reference ellipsoid when making maps. 10 is a ^conceptual diagram for understanding the difference between geodetic latitude φ and geocentric latitude ψ.

In order to model the earth, not only the shape of the spheroid but also the location and direction of the origin of the spheroid with respect to the actual earth must be determined. The center C of the earth ellipsoid 1001 is located at the center of mass of the earth, and the error is said to be within 2 cm. The Earth's rotation axis 1002 passes through the Earth's center of mass. Also, two points where the earth's axis of rotation 1002 meets the earth's ellipsoid 1001 are the North Pole (NP) and the South Pole (SP). Since the Earth's ellipsoid is oblate, the semi-minor axis of this spheroid coincides with the Earth's axis of rotation.

The coordinates of a point P on the Earth can be expressed as (X, Y, Z) in a three-dimensional Cartesian coordinate (three-dimensional rectangular coordinate). The 3D Cartesian coordinate system is set in the ECEF (Earth-Centered, Earth-Fixed) method. The origin of the three-dimensional rectangular coordinate system is located at the center (C) of the Earth's ellipsoid, and the Z-axis coincides with the minor axis of the spheroid. The direction from the South Pole to the North Pole is the positive (+) direction of the Z-axis, and the X-axis and Y-axis are included in the Equatorial plane. In fact, the two points where the earth's axis of rotation intersects with the earth's surface are the north and south poles. These north and south poles do not exactly coincide with the magnetic northern pole (north magnetic pole) or magnetic southern pole pointed to by the compass. That is, the Z-axis is the Earth's axis of rotation, and the X-Y plane is the equatorial plane. Earth-Fixed means that this coordinate system rotates as the Earth rotates.

The application of the optimal spherical coordinate system to this earth ellipsoid is called a geodetic datum. The geographic coordinate system or World Geodetic System (WGS) is a standard for cartography, geodesy and satellite-based navigation. The most recent WGS is a system called WGS 84, WGS 1984 or EPSG:4326, and GPS uses this system.

The plane containing the north and south poles also includes the center (C) of the Earth's ellipsoid, and the line of intersection between this plane and the Earth's ellipsoid is given as an ellipse. However, since the center of the ellipse coincides with the center of the Earth's ellipsoid, it is called a great circle for convenience. The line of intersection from the North Pole to the South Pole, or half of the great circle, is called the meridian or lines of longitude. The meridian passing through the Greenwich Observatory is the prime meridian (PM), and the meridian on the opposite side is the antimeridian (AM).

The coordinates of a point P on the Earth can also be expressed by the geodetic latitude φ, longitude λ, and ellipsoidal height h. A coordinate system using geodetic latitude φ, longitude λ and height h is called a geodetic coordinate system. Here, geodetic latitude is not measured based on a line segment connecting the origin C and point P in a three-dimensional rectangular coordinate system. At the point P, the normal n to the earth ellipsoid (1001) is lowered. A point 1003 where the normal line n intersects the earth ellipsoid 1001 will be referred to as an ellipsoidal point. If a tangent plane 1004 is drawn from the ellipsoid point 1003 to the earth ellipsoid 1001, then by definition the normal passes perpendicularly through the tangent plane 1004. The angle φ that the normal makes with the equatorial plane (XY plane) is the geodetic latitude. And the distance from the point ⁽ 1005) where the normal line meets the Z-axis to the point (1003) of the ellipsoid is the radius of curvature in the prime vertical R _N.

The radius of the semi-major axis of the Earth's ellipsoid is 6,378,137 ^m . If the radius of the major axis of the earth ellipsoid, that is, the major radius is a, and the radius of the semi-minor axis, that is, the minor axis is b, the eccentricity e of the earth ellipsoid is as shown in Equation 1 given

And the radius of curvature R _N of the hairline is given by Equation 2.

That is, the radius of curvature of the catheter is given as a function of the geodetic latitude φ, not a constant. In addition, the three-dimensional rectangular coordinates X, Y, and Z are given as Equations 3 to 5 as functions of geodetic latitude φ, longitude λ, and ellipsoidal height h.

The intersection of this earth ellipsoid and the plane of the equator is the equator, and the X-axis of the three-dimensional rectangular coordinate system is a straight line passing through the intersection point of the Prime Meridian and the equator at the center of the Earth.

The longitude of a point P on the Earth is the angle formed by the meridian plane containing the point with the X-Z plane, and is given by Equation 6.

On the other hand, the distance from the ellipsoid point 1003 to the point P is the ellipsoidal height h. Further, the angle formed by the line segment from the center C of the earth ellipsoid to the ellipsoid point 1003 with the X-Y plane is the geocentric latitude ψ. The geocentric latitude is given by Equation 7.

The formula for geodetic latitude is quite complicated and is given as Equation 8.

That is, the formula for obtaining geodetic latitude includes geodetic latitude. Therefore, it cannot be calculated simply by tapping a calculator. When we casually refer to latitude, we mean precisely geodetic latitude. The latitude displayed on digital maps such as Google Maps (https://www.google.com/maps) or Naver Maps (https://map.naver.com) is a geodetic latitude. On the other hand, longitude is the same concept as what you learned in elementary school textbooks, but there is a subtle difference in that the prime meridian does not exactly pass through the Greenwich Observatory. In any case, it is possible to mutually transform geodetic latitude φ, longitude λ, and ellipsoidal height h with the coordinates (X, Y, Z) of a 3-dimensional rectangular coordinate system using the above equation.

As can be seen from the foregoing, in order to specify an accurate three-dimensional position on the earth, in addition to (geodetic) latitude and longitude, the height h of the ellipsoid at that point must be given. However, the GPS coordinates given by the smartphone are geodetic latitude, longitude, and height above sea level. Altitude above sea level is the height measured based on the geoid, and the geoid is a virtual closed surface obtained when the height of average sea level is extended to land. The exact shape of the geoid is neither a sphere nor a spheroid. Although it is close to a spheroid, it is given as a rugged closed surface due to the difference in the amount and density of materials underground or on the ground, and it is virtually impossible to describe the entire shape of the geoid as a mathematical function.

Viewing GPS coordinates on a smartphone gives you (geodetic) latitude, longitude, and altitude above sea level, but without knowing the height of the geoid at that point, you cannot determine your exact three-dimensional location on Earth. However, unless you need the exact shape of the Earth, your current location, or the distance between two points, such as surveying, civil engineering, construction, or military operations, you probably don't need to know what height you are actually on the Earth's ellipsoid.

11 is a diagram for explaining the concepts of northbound distance and eastbound distance used in the conventional inventions of [Special 1] to [Special 2]. In FIG. 11, a sphere whose center is located at the center of mass of the Earth is assumed, and the radius of this spherical model Earth is R. The R value uses 6,378,137 m, the Earth's radius at the equator.

The origin C of the World coordinate system, or Earth-Centered Earth-Fixed three-dimensional Cartesian coordinate system, is located at the Earth's center of mass, and the Z-axis coincides with the Earth's axis of rotation. . In addition, the intersection point where the equator (L _o ) and the prime meridian (PM) meet is referred to as the latitude-longitude origin O. Then, the X-axis is a straight line passing through the origin of the graticule at the origin (C), and the direction of the Y-axis is automatically determined by the principle of Right-Handed coordinate system (RHS).

At this time, the northward distance N and eastward distance E of a point having geodetic latitude φ, longitude λ, and ellipsoidal height h are measured as follows. First, a point with geodetic latitude φ, longitude λ, and ellipsoidal height h is replaced by a point P with geocentric latitude φ, longitude λ, and geocentric altitude h. In addition, the point where the line segment from the origin C of the world coordinate system to the point P intersects the sphere is called the sphere point S(φ, λ), and the latitude line with the geocentric latitude φ is called ) The point w where L _φ and the antimeridian (AM) intersect is called a waypoint. Then, the northward distance (N) is defined as the length of an arc measured along the antimeridian (AM) from the South Pole (SP) to the path point (w), and the eastward distance (E) is defined as the path point (w) It is defined as the length of an arc measured along the line of latitude (L _φ ) from , to the ball point S(φ, λ) with the geocentric latitude φ and longitude λ.

According to this definition, the northbound distance is given as Equation 9 as a function of geodetic latitude φ, and the eastbound distance is given as Equation 10 as a function of geodetic latitude φ and longitude λ.

Inversely, formulas for obtaining geodetic latitude and longitude from northward and eastward distances are given as Equations 11 and 12.

Using this coordinate system, the distances north and east from any point on the earth have finite positive values. As illustrated in FIG. 11, this coordinate system measures all distances from the South Pole and must be measured along a defined path. The greatest advantage of this coordinate system is that it is possible to specify an arbitrary location on the earth with a unit of distance that has a degree of precision sufficient for everyday use.

12 is a conceptual diagram for understanding the layer (層, floor, story, level) model used in the conventional invention of [Special 1] to [Special 2]. In order to describe the entire earth with a concept consistent with a simple mathematical model, it is preferable to call the ground floor layer 0. In addition, the ground surface, the surface of a lake, and the sea level in the middle of the sea are all considered as layer 0. Here, the 0th floor refers to the ground surface where people can walk around on their feet in a natural state and the floor of a building continuously connected to the ground surface. Therefore, even if Gapdori jogs along the riverside road, swims in a lake, or finds a store he likes and enters the store from the sidewalk, it is all on the 0th floor. Also, when you have climbed Mt. Baekdu or Mt. Everest and are singing hurray at the top of the mountain, you are still on the 0th floor. In other words, the 0th floor has nothing to do with the height of the ellipsoid or the height above sea level. On the other hand, the layer we call the second layer is the +1 layer, and the third layer is the +2 layer. In addition, the first basement floor is the -1 floor, and the second basement floor is the -2 floor.

In the conventional inventions of [Special 1] to [Special 2], the ground core height, the ellipsoidal height, and the height above sea level are all ignored, and the integer F representing the floor is used instead. In addition, the northward distance N and the eastward distance E are used for the location in a horizontal space. And the integer F representing the layer is optionally used. In other words, if the location of a point is specified as (N, E, F), this means the F floor of a building with north-facing street N and east-facing street E. In practice, the geodetic latitude and longitude on floor F of a building denotes a particular point corresponding to a distance N north and a distance E east. On the other hand, if you only write (N, E), it means (N, E, 0). That is, it may mean outdoors or may mean the first floor of a multi-story building. In this way, the concept of a floor can be logically extended from the inside of a building to the outside to specify the indoor/outdoor locations integrally.

This model can be used for a variety of purposes, such as ordering food to be delivered, delivering mail, making an appointment with someone, or visiting a restaurant found on the Internet in a large city with many multi-story buildings.

[Special 3] discloses a map-based online platform using such a coordinate system. 13 is a conceptual diagram showing the configuration of a digital map system of the related art that provides indoor map service in the form of a web app. When a smartphone or desktop computer user or a delivery robot accesses a web server through the Internet, Google Chrome or Microsoft Edge ( You can use a digital map using a web browser such as Microsoft Edge. Since the digital map works as a web app, the web server and app server are effectively the same. Therefore, both the terms web server and app server can be used.

A user who wants a digital map service directly accesses a web server using a computer or smartphone, and the web server includes an outdoor map server, a building database, and a building data store. data store). It can be said that they are integrated to form the hardware of the digital map system.

An outdoor map server is a server that provides map tiles to a web server to draw an outdoor map. For example, a service server of Open Street Map (www.openstreetmap.org) providing tile service may be regarded as an outdoor map server.

The building database is a database capable of searching for information related to a building, such as a building name, address, homepage, geographical location, and a location where a building outline drawing file or floor plan file is stored.

The building data store is where vector data is stored as indoor map files, including building outline drawings and floorplans per level. . Building data storage can be thought of as Network Attached Storage (NAS) connected to the Internet, and as users and content grow, it can be one or more devices or servers. And the web server fetches the indoor map file from the building data storage and draws it overlaid on the correct location on the outdoor map.

In the conventional method, the map app could be used as a web app on a PC and as a native application on a smartphone. To this end, a web site for digital maps is created using HTML5/CSS3/JavaScript for PC, a native app is created with Kotlin for Android phones, and a native app is created for iPhone using Swift. Kotlin is similar to Java, and Swift is similar to C++. In the end, the app must be written in three independent languages: JavaScript, Kotlin, and Swift, and three times the effort is required to maintain and maintain the app.

The biggest advantage of the web app is that it can respond to both PC and smartphone with a single source, and there is no need to write, maintain, and maintain a separate app. The reason this is possible is because there is a great programming language available for web browsers called JavaScript. That is, there is a common platform that exists across PCs and smartphones.

This is the reason why software, which used to be used by installing programs contained in floppy disks or USB (Universal Serial Bus) disks on PCs in the past, can now be used by accessing the web and paying a fee. Because. Due to the remarkable development of web technology, even professional programs such as Microsoft Word or AutoCAD can be made into web apps.

On the other hand, the biggest drawback of web apps is that you have to access the website every time. For example, if you want to use Microsoft Word written as a web app, your PC or smartphone must be connected to the Internet, and you must visit the website every time to work on the word. When a website is visited, a client, that is, a web browser, connects to a host, that is, a corresponding web server, fetches necessary files, and creates and displays a web page.

This shortcoming was addressed with the development of a revolutionary technology called Progressive Web App (PWA). A PWA is an installable web app. In order for a web app to become a PWA, several conditions must be satisfied. First of all, you must use https protocol, not http, and have a JavaScript file called service work. You also need a manifest file and an icon to be displayed on the desktop of your computer or smartphone.

If you access the address of the Progressive Web App on your smartphone with Chrome or Edge, the PWA will run and the 'Install' button will appear. If you click this button, the PWA is installed on your smartphone and an icon appears on the desktop. When the PWA is installed, necessary files are also saved semi-permanently on the smartphone. So the next time you connect, you don't have to import the same file again. If you access a new page, or if there is an updated part of the software, only that part is newly imported. Therefore, it can be said that the biggest drawback of web apps has been removed with the advent of PWA.

As we have already seen, Google Maps provides indoor maps for large multi-story buildings. When the zoom of the map exceeds the preset value, the floor plan of the default floor of a large building providing indoor map service is displayed. A menu for selecting a floor appears on one side of the map screen. If you select a different floor from the menu, the floor plan of the base floor is replaced with the floor plan of the corresponding floor.

While this seems intuitively reasonable, it's actually more appropriate in an era when everyone sat in a chair and looked at maps on computer monitors. It's not the best way now, when everyone has a smartphone and self-driving cars and unmanned delivery robots are increasingly becoming a reality.

When you run a digital map with your smartphone, the location of your smartphone is calculated from GPS signals and displayed on the map. That is, if you run the map on your smartphone, you can display your current location on the map, and you can program the map to pan automatically so that your location is always in the center of the map. Therefore, if the owner of the smartphone enters the inside of a building, a menu for selecting a floor can be displayed without clicking the mouse or touching the screen. That is, if the current location is inside a multi-story building where a floor can be selected, it would be convenient to display a menu for selecting a floor without clicking or touching.

In this method, if the owner of the smartphone continues to stay on the ground floor, he can ignore the floor selection menu, and if he intends to move to another floor using the stairs or elevator, the floor plan of the corresponding floor is displayed in advance through the floor selection menu. It will be convenient to check. In addition, in the case of a desktop computer or laptop, assuming that the center of the map screen is your location, and panning the map screen, if the center of the map is located inside a building that provides indoor maps, a floor selection menu will be automatically displayed. can In addition, when combined with various technologies that can identify floors, it will be possible to automatically change the view of the floor plan when the floor is changed.

14 is a part of JavaScript code written in OpenLayers grammar, and shows the configuration of layers in the embodiment of the conventional invention of [Special 3]. Layers are composed of baseLayer, BBoxLayer, buildingLayer, bldLabelLayer, floorLayer, spaceLabelLayer, and markerLayer. Layers that are declared first are drawn first, so baseLayer is at the bottom and markerLayer is at the top. baseLayer is a layer that receives map tiles from OpenStreetMap as picture files and draws an outdoor map. The baseLayer is a raster layer, and all others are vector layers.

A markerLayer is a layer for drawing a cross at the center of a view for the convenience of the user. The remaining layers except baseLayer and markerLayer form a structure layer group. Among them, buildingLayer is a layer for drawing a building outline drawing, and floorLayer is a layer for drawing a plan view of any one floor among floor plans per level of a building. BBoxLayer is a layer for drawing a minimum bounding box containing a building for reference, and bldLabelLayer is a layer for displaying key information related to a building, such as the building's name or homepage address. And spaceLabelLayer is a layer for showing each other of individual spaces shown in the floor plan.

Here, space means an indoor/outdoor place that has a location property and an area. Spaces have boundaries given by closed curves or simply polygons. A typical example is a room. A room has walls, a door, and a ceiling, so you can specify the longitude and latitude of the center of the room and the floor number on which the room is located. In addition, the area of the room can be specified in units of m ² . However, there are parts of the living room that are not blocked by walls or doors, but anyone can specify where and how far the living room is. Such a living room is also specified as a space in the prior art.

Although FIG. 14 is only an example, there is a map layer group that displays an outdoor map first, and a structure layer group for showing the outline drawing or floor plan of a building as a vector layer on top of it. It is important that there is In FIG. 14, the map layer group is a layer group having only one layer (ie, baseLayer), but in an example in which a general map and a satellite map are used together, the map layer also has a plurality of layers. Also, the structural layer group may be composed of several layers. The reason for configuring multiple layers like this is to do structural programming.

15 shows the main window of the digital map in the embodiment of the conventional invention of [Special 3]. This map follows the Web Mercator projection. Web Mercator projection was adopted by Google in 2005 and is now a projection method adopted by most Internet map service providers, and SRID (Spatial Reference Identifier) is given as EPSG:900913 or EPSG: ³⁸⁵⁷ . The official name of EPSG:3857 is WGS 84/Pseudo_Mercator. Webb Mercator projection is also referred to as spherical Mercator projection. In the Webb Mercator projection, longitudes range from -180° to +180°, but latitudes range only from ±85.051129°.

The eastward distance (x) and northward distance (y) in the Webb Mercator projection are given as Equations 13 to 14 as functions of the geodetic latitude φ and longitude λ.

As described above, the most essential element of a digital map is a view, and it is desirable to have a side panel to facilitate interaction with a user. 15, the view has a rectangular shape, and the range of the outdoor map visible in the view is called a view extent. The view range is indicated by the minimum and maximum values of the longitude of the view area, the minimum and maximum values of (geodetic) latitude, or equivalently, the minimum and maximum values of the eastward distance (x) and the northward distance (y) in the Web Mercator projection. can be expressed as the minimum and maximum values of

In addition, there is a cross-shaped marker at the center of the view, and the coordinates of the center of this view are the geodetic latitude and longitude, and the eastward distance (x) and northward distance (y) in the Web Mercator projection. displayed on the panel. Webb Mercator coordinates cannot be used above latitude 85°, but are interchangeable with longitude and latitude below.

In FIG. 15, OK Venture Town is located at the center of the view. When the center of the view is located within the building outline of this building (hereafter referred to as the building at the view center), the name of this building is displayed on the left side panel. Since it is a multi-story building, a floor selector appears where you can select a floor.

Figure 15 also shows a minimal bounding box containing the outline of the building within it. The minimum bounding box is used to quickly determine which buildings should or shouldn't appear in the view. The coordinates of the minimum bounding box are calculated in advance and stored in the building database.

In this way, the embodiment of the prior invention integrates an indoor map including an outdoor map and a floorplan of a building in a view of a digital map. provides a way 16 is a flowchart illustrating an entire process of displaying a digital map in an embodiment of the related art.

This includes maintaining an outdoor map server, a data store that manages building outline drawings and floorplans in individual folders for each building. The maintaining step includes maintaining a building database for managing map setting data of buildings.

The map setting data stored in the building database includes the unique building identification number (primary ID) of each building, that is, the building ID bldID, the full path to the individual folder, and the lowest floor. floor), the floor number of the highest floor (maxFloor), the building outline display zoom level (zoomShowBld, zoom level for showing building outline), and the floor plan display zoom level (zoomShowFloor, zoom level for showing floorplan) Includes a northing corresponding integer I and an easting corresponding integer J.

The geographic coordinates of the centroid of OK Venture Town, where the applicant's office is located, are given as geodetic latitude 36.32981409° and longitude 127.42671111°. is given as N = 14062970.577m and E = 27570402.871m respectively. Thus, the northing corresponding integer I and the easting corresponding integer J, rounded off of the northing distance N, are given as 14062971 and 27570403, respectively. From this, if you calculate the name of the folder that stores OK Venture Town's building outline file (Bld.geojson) and floor plan files (G.geojson, F1.geojson, F2.geojson), it is given as N14062971E27570403. Therefore, the building file of OK Venture Town, which is a three-story building, is stored in the following structure.

floor plan folder path folder name file name building outline drawing https://www.buildings.land/ N14062971E27570403 Bld.geojson 1st floor plan " " G.geojson 2nd floor floor plan " " F1.geojson 3rd floor floor plan " " F2.geojson

First, the URL (Uniform Resource Locator) of the data store is https://www.buildings.land. In this, each building has its own folder, and the files related to OK Venture Town exist in a folder called N14062971E27570403. OK Venture Town, a 3-story building, has a total of 4 files stored including the floor plan files of the 1st, 2nd and 3rd floors and the building outline file. In such a file structure, an indoor map can be effectively displayed on top of an outdoor map using the algorithms shown in FIGS. 16 and 17 .

The northbound distance correspondence integer and the eastbound distance correspondence integer are integers obtained by rounding up the northbound distance and the eastbound distance, respectively. However, since the distance to the north and the distance to the east are given as positive real numbers at any location on the earth except for the South Pole, the integer corresponding to the distance to the north and the distance to the east are actually given as natural numbers.

When the user starts the digital map, the steps of displaying the outdoor map in the view with the initial map settings and updating the view according to the user's zoom, pan, and rotate selections are performed. include Renewing the view not only updates the outdoor map, but also zooms, pans, and rotates the outlines and floor plans of the buildings included in it.

In the preset data of the digital map, there is an absolute zoom threshold value, zoomQueryingBuildingTable, which displays the floor plan of the building. For example, it is neither possible nor necessary to display the floor plans of all buildings in Korea when viewing the map of Korea. Therefore, a zoom level that needs to show a floor plan for some buildings with a zoom higher than a set value may be set to 15, for example. In this way, if the zoom of the digital map is greater than the pre-set value, the building database is searched and a list of buildings whose geographic location is included in the view extent, that is, the view extent building list bldIDsInExtent It includes the steps of writing

17 is a flow chart illustrating a floor plan display subroutine for displaying a floor plan for the first time in a view. If the number of buildings in the view range building list is greater than 0, a recursive loop like the for loop starts, and the for loop starts with the first building in the list (i = 0). This first building is given as bldIDsInExtent[0], and the last building is given as bldIDsInExtent[bldIDsInExtent.length - 1].

Here, the list of buildings in the view range (bldIDsInExtent) is the coordinates of the center of the building, or a list of buildings in which all or part of the building is located in the view and registered in the building database. However, some buildings may be too small to display at this zoom level. Therefore, for each building in this list, the building outline is displayed only when the zoom level of the digital map is greater than the zoom level (zoomShowBld) displaying the outline. In addition, a list of buildings to be displayed with outlines - referred to as a list of buildings to display outlines (bldIDsToShow) - is extracted and managed from the list of buildings in the view range.

If this building, that is, the ^ith building, is a building in the list of buildings to be outlined, the building outline drawing of this building is retrieved from the data store and added to the buildingLayer. . This outline drawing is created in GeoJSON format.

The outline of the building should be given as a closed curve or polygon. However, the GeoJSON format does not allow curves, so in reality it should only be given as a polygon. If the outline is given as a polygon, it can be determined whether the view center is inside or outside the polygon.

The coordinates of those points are given in the form [distance east, distance north] or [longitude, latitude]. In JavaScript, square brackets [] denote an array. So, when you add this outline drawing to the buildingLayer, it is automatically added to the correct location.

Next, if the zoom level of the digital map is greater than the zoom level (zoomShowLabel) displaying the label including the name of the building for the buildings in the building list (bldIDsToShow) to display the building outline, the label of the building to the building label layer (bldLabelLayer).

Next, for the buildings in the list of buildings to be displayed as outlines, it is investigated whether the zoom level of the digital map is greater than the zoom level for showing floor plans (zoomShowFloor, zoom level for showing floorplan) of the buildings, and the zoom level of the digital map is the zoom level for showing floor plans. For buildings taller than the level, again check if the building has a ground floor. This can be found by examining whether the lowest floor (minFloor) of the building is less than or equal to 0 and the highest floor (maxFloor) is greater than or equal to 0.

Next, a list of buildings that have passed both of these tests - hereinafter referred to as a list of buildings subject to floor plan display (floorplanIDsToShow) - is created, and for the buildings in this list, floor plans of the ground floor are imported from the data store and It is overlapped and displayed in accordance with the outlines of the corresponding buildings. Since the locations of the points in these floor plans are all given in the form of [distance to the east, distance to the north] or [longitude, latitude], adding a floor plan to the floorLayer will create a drawing of the outline of the building and the ground. All floor plans are displayed in the correct location on the outdoor map.

What has been described so far is a flow chart from the beginning of a digital map to the first view of a building's floor plan. A map update process may then repeat the above process, such as zooming, panning, or rotating operations to add a new floor plan, move an existing floor plan, or remove some of the existing floor plans. there is. That is, after initializing all the previously created view range building list (bldIDsInExtent), outline display target building list (bldIDsToShow), and floorplan display target building list (floorplanIDsToShow) to 0, and removing all outline drawings and floor plans in the view, open the view. You can also start over from the update view.

However, it is very inefficient to remove all building outline drawings or floor plans and draw them again whenever user interaction occurs. Therefore, it is more effective to use an algorithm that maintains and updates the outline display building list (bldIDsInView) in addition to the view range building list (bldIDsInExtent) and outline display target building list (bldIDsToShow). That is, when the view is changed, after newly creating the view range building list (bldIDsInExtent) and the outline display target building list (bldIDsToShow), delete or update the outline drawing of the existing building by comparing it with the outline display building list (bldIDsInView). and adding an outline drawing of the new building, and the same steps are performed in relation to the floor plan.

A digital map system that performs this function includes an outdoor map server and data that manages building outline drawings and floor plans of buildings in individual folders for each building. A data store, a building database that manages map setting data of buildings, and outdoor maps and floorplans of buildings in views. A computer program stored on a medium that executes a series of stages to integrally display an indoor map containing

The above sequence of steps includes starting the digital map with initial map settings, showing the outdoor map in the view, and updating the view according to the user's zoom, pan, and rotate selections. and, if the map zoom of the digital map is greater than or equal to a preset threshold zoom value, the building database is searched and the view range building whose geographic location is included in the view extent. Creating a list, and executing a floorplan display subroutine and a floor selection subroutine if the number of buildings in the view range building list is greater than zero.

On the other hand, Figure 18 is an actual plan view of the second floor of OK Venture Town. The wall thickness was expressed proportionally compared to the size of the entire building, and the size and type of doors and windows can also be known. This detailed floor plan provides a lot of information needed if you want to rent an office in this building.

On the other hand, looking at the indoor map of Madison Square Garden shown in FIG. 6 or the indoor map of OK Venture Town shown in FIG. Therefore, it is difficult for a potential client to rent a Madison Square Garden space to have all the information he or she needs to develop a business plan.

On the other hand, the prior art related to the indoor map is as follows.

In [Special 4], route guidance to the target point, life information, and building exterior video are displayed on the map by efficiently linking the actual measurement map and life information to the road guidance kiosk, enabling accurate and prompt route guidance. A one-stop road guidance information system is disclosed.

[Special 5] includes the step of setting a coordinate system on an indoor drawing using an electronic device, the step of extracting the center coordinate information of each divided space in the room and the entrance coordinate information of the entrance for entering and exiting between floors or the outside; An indoor electronic map generation method comprising the steps of generating an indoor movement line for walking in a drawing, extracting points of interest at predetermined intervals along the indoor movement line, and setting coordinate information and attribute information of the point of interest. has been initiated.

[Special 6] to [Special 7] disclose a technology for selecting a floor of a multi-story building from an interactive digital map. The external representation of a multi-story building is displayed on the digital map, and when the user selects a point on this external representation, a 3D model of the building is displayed, with the floor plan of the building partially overlapped. do. When the user swipes the model vertically, the floor plan of the selected floor is activated in a way that distinguishes it from the floor plans of the other floors.

In [Special 8], a navigable area and an unmovable area (e.g., wall) are distinguished by image processing of a floor plan image of a building, and a navigable area and an unmovable area are divided into different areas. A technique for generating a color-coded indoor map is disclosed.

[Special 9] discloses a method of providing the user with the structure of the indoor space of a building registered from a map provider in the form of a map, and allowing the user to use and add an indoor map through an open API.

[Special 10] includes a model configuration unit that constructs a building model corresponding to the building using drawing information of the building, a building information request unit that requests POI information about the building from an outdoor map POI (Point of Interest) server, and a building model discloses an indoor map authoring tool including a matching unit for matching POI information on a building and a building indoor map generating unit for generating indoor map information of a building using a building model matched with POI information on a building.

[Special 11] discloses a technique in which a network server provides indoor map features to a client device. When a user requests outdoor map data for a specific geographic location and zoom level, the network server checks whether there is a multi-floor building among the outdoor map data, and then maps the indoor map of the default floor for the multi-floor building. and an indoor map indicator are displayed on the user device, and the indoor map is selectively displayed as the user manipulates the indoor map indicator.

[Special 12] presents a computer implementation method of a network server that enables quick conversion from a base map displaying outdoor map data to indoor map data, using a widget. Thus, a layer to be displayed can be easily selected. Also, in a multi-floor building, a floor that users other than the first floor will be interested in is set as the default floor. This is because there are many cases where parking lots are located on the first floor.

[Special 13] discloses an apparatus and method for constructing an indoor map for a target facility. The indoor map building device includes an information extraction unit for extracting cloud point information from scan information for each point inside a target facility to build an indoor map, and a diagram of the shape of the target facility based on the cloud point information for each point. It includes an indoor map building unit that builds an indoor map of the target facility as the work is performed. The indoor map building unit corrects a drawing error generated according to the movement of the scanning device based on acceleration information obtained from the scanning device scanning each point inside the target facility.

[Special 14] discloses a method of projecting a building indoor floor plan to physical map coordinates using a computer. To this end, building location information is obtained from satellite photos, and a real-world objects database including latitude and longitude for visual elements is constructed. Then, using this database, the relative coordinates (x, y) of each object on the indoor floor plan are projected as (x, y) coordinates in the real world, that is, (longitude, latitude).

[Special 15] discloses a technique of extracting an outline from a floor plan image of a building and generating a three-dimensional drawing in which the extracted outline is set as a wall surface.

[Special 16] includes the step of analyzing the attributes of nodes existing on the indoor map for each floor of the building, the step of detecting one or more inter-floor nodes based on the attributes of the analyzed nodes, and the step of connecting the detected inter-floor nodes to create new links. An indoor map creation method comprising the step of generating is disclosed.

[Special 17] discloses a method and apparatus for automatically creating an indoor map using a drawing image file of a building. Specifically, the step of displaying a map creation screen including an outdoor map, the step of designating a building for which an indoor map is to be created among the buildings included in the outdoor map, the step of calling a drawing image of the designated building, the called drawing image matching with an outdoor map area corresponding to the location of the designated building, detecting at least one of a Point of Interest (POI), a polygon, and a polyline from the called drawing image, and the detection and creating an indoor map for at least a partial area of the building based on at least one of a POI, a polygon, and a polyline. In addition, the step of detecting a polygon or polyline having a size greater than a threshold value and a relative coordinate value of the polygon or polyline from a simplified drawing image, and converting the relative coordinate value into an absolute coordinate value on the indoor map. .

[Special 18] discloses a layer control tool capable of changing the display state of a geographic data layer displayed in a geographic information system. The layer control tool can make one or more layers of a plurality of geographical data layers shown in the geographic information system visible, invisible, or converted into a locked state so that the display state is not changed. Types of geographic data layers include terrain data layers, street information data layers, three-dimensional building data layers, and border data layers. do. The layer control tool can be moved to any position on the screen where geographic imagery is displayed. Such a layer control tool can be usefully used in a portable device such as a smart phone having a small screen size.

[Special 1] Kwon Gyeong-il, "Method for specifying geographical location and database using the same, and database of databases", Republic of Korea Patent Registration No. 10-2234723, Registration Date March 26, 2021. [Special 2] Kwon Gyeong-il, "Method for specifying location on the earth including indoors and database using the same", Republic of Korea Patent Registration No. 10-2308960, Registration Date September 29, 2021. [Special 3] Kyungil Kwon, "Online Platform Based on Digital Map", Korean Patent Registration No. 10-2344087, Registration Date December 23, 2021. [Special 4] Kim Sam-geun, Seo Jeong-min, "One-stop route guidance information system", Republic of Korea Utility Model Registration No. 20-0430083, registration date October 26, 2006. [Special 5] Kwak Seong-hoon, "Method of generating indoor electronic map data", Korean Patent Publication No. 10-2012-0072124, published on July 3, 2012. [Special 6] Zhou Bailiang, Jonah Jones, "Floor selection on an interactive digital map", US Patent No. 8,464,181, Registration Date June 11, 2013. [Special 7] Zhou Bailiang, Jonah Jones, "Floor selection on an interactive digital map", US Patent No. 9,323,420, Registration Date April 26, 2016. [Special 8] Guanfeng Li, Faen Zhang, Feng Wang, "Generating an indoor map model", International Patent Publication No. WO 2013/104127, published on July 18, 2013. [Special 9] Kim Dong-hwan, Kwon Yeon-hee, Choi Jeong-ah, Kim Hyeong-chan, "Indoor map database, map service providing device and method, indoor map providing device using open API, and indoor map production device and method", Republic of Korea Patent Registration No. 10-1312294 , registration date September 23, 2013. [Special 10] Lee Jae-myung, "Indoor map authoring tool and method", Republic of Korea Patent Publication No. 10-2013-0112492, published on October 14, 2013. [Special 11] Seth Jacob Pensack-Rinehart, Gavin Reaney, Yatin Chawathe, Nicholas Lee, Sascha Benjamin Brawer, Paul Messmer, "Providing indoor map data to a client computing device", US Patent Publication No. 2015/0019625, Publication Date 2015 January 15, 2011. [Special 12] Seth Jacob Pensack-Rinehart, Gavin Reaney, Yatin Chawathe, Nicholas Lee, Sascha Benjamin Brawer, Paul Messmer, "Enabling quick displays transitions between indoor and outdoor map data", US Patent No. 9,417,777, Registration Date Aug. 2016 16th of the month. [Special 13] Park Won-gi, Yoo Jae-wook, Lee Ho-jin, Jeong Eun-yong, Sim Byeong-ryeol, Kim Byung-jo, "Indoor map construction apparatus and method using cloud points", Korean Patent Registration No. 10-1803598, Registration Date November 24, 2017. [Special 14] Pornchai Direkwut, "Method and system of generating an indoor floor plan", US Patent No. 10,048,077, Registration Date August 14, 2018. [Special 15] Jo Jeong-hee, In-seong In-seong, Jae-min Seol, "Method and apparatus for providing 3D map information", Korean Patent Publication No. 10-2018-0101074, published on September 12, 2018. [Special 16] Lim Lim, Jin-kwon Lee, "Method and apparatus for creating indoor maps", Korean Patent Registration No. 10-1985699, Registration Date May 29, 2019. [Special 17] Lim Hyun-hyun, Lee Jin-kwon, "Method and apparatus for creating indoor maps", Korean Registered Patent No. 10-2131999, Registration Date July 2, 2020. [Special 18] David Kornmann, Julian Charles Mercay, "System and method for geographic data layer management in a geographic information system", US Patent No. 11,132,102, Registration Date September 28, 2021.

[Non-Special 1] Wikipedia (https://en.wikipedia.org/wiki/Google_Maps), "Google Maps". [Non-Special 2] Wikipedia (https://en.wikipedia.org/wiki/GeoJSON), "GeoJSON". [Special 3] IETF (https://www.rfc-editor.org/rfc/rfc7946), "The GeoJSON Specification: RFC 7946". [Special 4] Wikipedia (https://en.wikipedia.org/wiki/World_Geodetic_System), "World Geodetic System". [Special 5] Seonggon Lee, "Understanding of Geodetic Coordinate System and Map Projection for Physical Exploration Practitioners", Geophysics and Geophysical Exploration, vol. 19, no. 4 (2016), pp. 236 to 248. [Non-spec 6] National Geospatial-intelligence Agency (NGA), "Web Mercator map projection", NGA_SIG_0011_1.0.0_WEBMERC (2014). [Special 7] Wikipedia, "Web Mercator projection".

We intend to provide indoor maps based on actual measurements.

An indoor map of one floor of a building is created using CAD software and a GPS receiver. This method includes the steps of preparing a CAD drawing including a plan view of any one floor of a building in a local coordinate system having a unit of distance, setting a relatively fixed reference point and reference line for the building, and using a GPS receiver to perpendicular to the plane. Determining the coordinates of the reference point and the direction of the reference line in the coordinate system, converting the local coordinate system of the CAD drawing into a plane Cartesian coordinate system using the determined coordinates of the reference point and the direction of the reference line, converting the coordinates on the plan view from the coordinates of the plane Cartesian coordinate system Converting to the coordinates of the coordinate system.

By superimposing a floor plan based on actual measurements on an outdoor map, it is possible to easily grasp necessary information related to a building.

1 and 2 are maps in which map tiles are displayed together with maps around Korea in open layers.
3 is a conceptual diagram illustrating the concept of a layer in map production;
4 to 5 are examples of baro e-maps.
6 is a screen of a start page of Google's indoor map.
7 and 8 are enlarged indoor maps of the 6K floor and the second basement floor in Google's indoor map.
9 is a view of displaying geometric figures written in GeoJason on an outdoor map.
10 is a conceptual diagram for understanding the difference between geodetic latitude and geocentric latitude.
11 is a conceptual diagram of northbound and eastbound distances used in the prior art.
12 is a conceptual diagram illustrating the concept of layer information in the prior art.
13 is a conceptual diagram showing the configuration of a digital map system according to the related art;
Fig. 14 is a diagram illustrating the configuration of layers in an embodiment of the prior art;
15 is a diagram showing a view of a digital map and an example of a building in the center in an embodiment of the prior art.
16 is a flowchart showing a digital map algorithm in the prior art.
17 is a flowchart of a plan view display subroutine in the prior art.
18 is a plan view of the second floor of OK Venture Town.
19 is a building status diagram of the first floor of OK Venture Town.
Figure 20 is a picture comparing the outline of the satellite image and the building.
21 is buildings near OK Venture Town extracted from a numerical map.
22 is a view of the plan view of the Daejeon Jungang-ro underground shopping center displayed in the spherical Mercator coordinate system.
23 is a plan view of Daejeon Jungang-ro Underground Shopping Mall displayed in a geographic coordinate system.
24 is a conceptual diagram illustrating reference points and reference lines relatively fixed with respect to a building in the first embodiment of the present invention.
25 is a photograph of measuring GPS coordinates at a reference point according to the first embodiment of the present invention.
26 is a view in which the floor plan of the building is moved so that the relative reference point on the floor plan of the building coincides with the absolute reference point in the first embodiment of the present invention.
27 is a view in which the floor plan of a building is rotated around a reference point so that the relative reference line on the plan view of the building coincides with the absolute reference line in the first embodiment of the present invention.
28 is a screen of a plan view displayed in absolute coordinates opened in QGIS.
29 is a view comparing the outline of the OK Venture Town building extracted from Baro e Map and the outline of the building obtained by actual measurement in QGIS.
30 is a view showing the outline of OK Venture Town superimposed on a V-World map;
31 is a panoramic view of Lotte World Tower.
32 is a view of the Seoul National University Central Library.
33 is a diagram illustrating the configuration of layers in an embodiment of the present invention;
34 shows the outline of the ground floor of OK Venture Town displayed on an outdoor map.
35 to 37 are indoor maps of the 1st, 2nd and 3rd floors of OK Venture Town, respectively, displayed on the outdoor map.
38 to 39 are indoor maps of the second floor of OK Venture Town in the third embodiment of the present invention.
40 is a portion of program code showing floor plan layer constants;
41 shows the code of the floor plan style function.
42 to 49 are examples of plan views of a fourth embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 19 to 49 .

A floor plan of a building is usually created with CAD (Computer Aided Design) software such as AutoCAD, and coordinates in the CAD drawing are measured from an origin that is fixed relative to the building. That is, the coordinates on the plan view are given as relative coordinates or local coordinates with respect to the origin. The unit of the local coordinate system is given as a distance, and millimeters or inches are mainly used.

19 is a building status map of the first floor of the OK Venture Town building. The dimensions of this building status map are given as relative coordinates measured from the lower left corner of the building, and it can be seen that the size of this building is 26.7m in the horizontal direction and 23.8m in the vertical direction.

On the other hand, an outdoor map or an indoor map superimposed on an outdoor map must be given absolute coordinates such as [longitude, latitude] or [distance eastward, distance northward]. In the prior invention of [Special 17], a method of converting relative coordinates into absolute coordinates such as [longitude, latitude] after moving, rotating, or enlarging/reducing the floor plan of the building to conform to the outline of the building on the outdoor map is used. did

However, there are three major problems with this method. Organizations such as the National Geographic Information Institute produce outdoor maps based on satellite images. First, after loading a satellite image in a program such as AutoCAD, a numerical map is created by tracing the outline of a feature such as a building or a road. In addition, each layer required for outdoor map production is prepared by separating topographical features such as buildings, roads, and rivers into respective layers in the digital map.

20 shows the outlines of buildings near the OK Venture Town building, extracted from the numerical map of the National Geographic Information Institute, overlaid on a Kakao satellite map to illustrate this process. The outline of the building extracted from the numerical map is marked with a white line, and OK Venture Town is shown in a red rectangle in the center of the screen. In this way, the building outline drawing based on the satellite imagery is inevitably inaccurate.

21 shows the outlines of buildings around OK Venture Town extracted from the numerical map. Comparing FIG. 21 with FIG. 19, it can be seen that the shape of the building itself is incorrect. For example, the angle of the lower right corner of the OK Venture Town building is not right angle. Numerical maps and outdoor maps generated from them are intended for everyday use, such as finding directions, and should not be used to refer to the exact location or shape of a building. In addition, since the shape of the building shown on the outdoor map is inaccurate, even if the floor plan of the building is moved, rotated, or enlarged/reduced, it cannot exactly match the outline of the building shown on the outdoor map.

Another problem is that the shape of a building is distorted when an outdoor map is displayed in a geographical coordinate system, that is, a coordinate system given by [longitude, latitude]. 22 is a plan view of the Daejeon Jungang-ro Underground Shopping Mall displayed in a spherical Mercator coordinate system (EPSG: 3857). However, in the spherical Mercator coordinate system, the shape and direction of the building are displayed correctly, but the size is severely distorted, and the difference increases as the latitude increases.

Meanwhile, FIG. 23 shows the same plan view displayed in a geographic coordinate system, that is, a longitude and latitude coordinate system (EPSG: 4326). In the latitude and longitude coordinate system, a rectangle does not look like a rectangle, and a circle does not look like a circle. Therefore, it is difficult to match the outline of the building on the outdoor map even if the exact floor plan of the building is moved, rotated, or enlarged/reduced.

Moreover, it is said that the location on the outdoor map we use in everyday life can usually differ by up to 2m. In other words, it is easy to build a building on someone else's land while building a building based on an outdoor map. On the other hand, the Building Act stipulates 2 to 3 cm as the tolerance for positioning, which is the same as the normal positioning error of high-precision GPS receivers used in civil/construction works.

In summary, the shape or location of the outline of a building on an outdoor map is inaccurate, and it is very difficult to match the outline of a building on an outdoor map with a method of moving, rotating, or enlarging/reducing an accurate floor plan of a building. Therefore, a more accurate method is needed to convert the floor plan of a building into an indoor map.

24 shows a CAD drawing including a building outline measured along the outer wall of the OK Venture Town building on the first floor. This outline can be considered as a simplified state of the floor plan, and the method is the same even if it has a measured floor plan rather than a building outline. However, in the embodiment of the present invention, the floor plan preferably includes at least the building outline measured along the outer wall of the building. The building outline is preferably a polygon, but in the first embodiment, it may be given as connected line segments.

In FIG. 24 , the length of the outline in the horizontal direction is 26,960 mm, which is 260 mm longer than 26,700 mm shown in FIG. 19 . The reason is that the center line of the wall is displayed in FIG. 19, but the outline of the building wall is displayed in FIG. 24.

The coordinate origin of the local coordinate system is at the corner of the wall on the door side in the lower left corner of the CAD drawing. In addition, since the horizontal axis and the vertical axis are set along the two walls that meet at the origin, they do not coincide with any of the north, south, east, and west directions. In addition, the ^first corner point C ₁ and the second corner point C ₂ were set on the left and right sides of the building, respectively, and the point 4m away from the wall in the vertical direction from the first corner point (C ₁ ) was the reference point. (reference point) was set to P. In addition, a point 4.7 m away from the wall in the vertical direction from the second corner point (C ₂ ) of the building is set as an end point E, and a line segment connecting the reference point and the end point is called a reference line. Datum points and datum lines are established to determine the location and orientation of buildings.

Instead of the first corner point and the second corner point, two arbitrary points of the outer wall may be selected. However, if you select two points in the middle of the wall, it will be difficult to identify the two points in the actual building or in the CAD drawing. Therefore, it is possible to select two points on the outer wall of the building, and select a reference point and an endpoint spaced apart from the building by a certain distance from the two points, but in reality, it would be desirable to select the corner of the building that is easy to identify. In addition, selecting a corner has the advantage that when selecting a reference point or end point that is a certain distance away from a building, it is easy to make the distance the distance measured vertically from the wall surface.

25 is a photograph of measuring location information, that is, GPS coordinates, by installing a high-precision GPS receiver at a reference point. After the line was stretched in the direction perpendicular to the wall at the first corner point (C ₁ ), a point where the distance was 4 m was found with a tape measure. The reason for installing the reference point away from the wall of the building in this way is that the measurement point of the GPS receiver cannot be accurately located at the first corner point (C ₁ ), but if it is attached to the wall of the building, half of the sky is invisible, so the measurement point This is because the number of visible GPS satellites is reduced. The greater the number of GPS satellites visible from the measurement point, the faster and more accurately the GPS coordinates are obtained.

The GPS receiver used in this test can obtain GPS coordinates with millimeter accuracy when measured under the best conditions. It can also be obtained by Easting E and Northing N from .

The plane rectangular coordinate system is not a coordinate system used globally, but is a coordinate system used locally by dividing sections such as Korea or the eastern part, central part, and western part of the Republic of Korea. For example, the UTM coordinate system divides the earth into 60 zones. The planar Cartesian coordinate system usually uses the Transverse Mercator projection method, and the advantage of using the Planar Cartesian coordinate system is that the distance or direction is accurately given. EPSG:5181 or EPSG:5186 can be used as a planar Cartesian coordinate system within Daejeon City, and the UTM (Universal Transverse Mercator) coordinate system or the Korean UTM coordinate system, K-UTM, can also be used.

In Example 1 of the present invention, after installing the GPS receiver at the reference point as shown in FIG. 25, the GPS coordinates were obtained as eastward distances and northward distances using the Korean Central Coordinate System (EPSG: 5186). Absolute coordinates at the reference point are (E: 238324.651m, N: 414741.660m), and absolute coordinates at the end point are (E: 238305.609m, N: 414708.643m). The measurement error on the instrument was found to be less than 1 cm.

The reference point, end point, and reference line have two sets of coordinates. One is relative coordinates or local coordinates measured based on the origin of the local coordinate system, and the other is absolute coordinates in a planar Cartesian coordinate system obtained using a GPS receiver. Reference points, end points, and reference lines having local coordinates are referred to as relative reference points, end points, and reference lines, and reference points, end points, and reference lines having absolute coordinates are referred to as absolute reference points, end points, and reference lines. Therefore, in FIG. 24, the reference point P, end point E, and reference line L are precisely the relative reference point, end point, and reference line.

In addition, the CAD drawing shown in FIG. 24 is composed of a building outline drawing, which is a floor plan or a simplified floor plan, and other drawn elements. For example, the origin, first corner point (C ₁ ), second corner point (C ₂ ), reference point (P), end point (E), and reference line (L) are all elements that do not belong to the plan view.

The method of converting the floor plan of a building into an indoor map based on the relative coordinates and absolute coordinates of the reference point and end point thus obtained is as follows. First, the unit of the coordinate system of the CAD drawing shown in FIG. 24 is converted from millimeter (mm) to meter (m). To this end, the CAD drawing shown in FIG. 24 is scaled down to 1/1000. In addition, a reference point and an end point, that is, an absolute reference point (P') and an end point (E') having absolute coordinate values measured by a GPS receiver are added to the CAD drawing, and an absolute reference line (L') connecting the two points is also added.

Next, the reference point relative to the outline of the building or the floor plan, the end point, and the reference line are moved together so that the relative reference point (P) coincides with the absolute reference point (P') on the CAD drawing. 26 shows a CAD drawing obtained through this process. Therefore, the coordinate values of the two reference points, that is, the relative reference point and the absolute reference point, are given as [x (eastward distance): 238324.651m, y (northward distance): 414741.660m].

As a result of this work, the reference point, the end point, and the reference line exist in duplicate. A set is a set of datum points, endpoints, and datum lines that are fixed relative to the outline of the building (i.e., the simplified floor plan). They were moved (translated) like the floor plan of the building. These are the relative reference point P, the relative end point E, and the relative reference line L.

On the other hand, the reference point and end point directly added to the drawing with the absolute coordinate values obtained from the GPS receiver are the absolute reference point P' and the absolute end point E', respectively, and the absolute reference point P' and the absolute end point The line segment connecting (E') is the absolute reference line L'.

Since the coordinates of the relative reference point coincide with the coordinates of the absolute reference point, the relative reference point (P) and the absolute reference point (P') coincide because the floor plan of the building, the relative reference point, the end point, and the reference line are moved together on the CAD drawing.

Next, with the reference point as the pivot point, the plan view, the relative reference point, the end point, and the reference line are rotated together so that the direction of the relative reference line (L) coincides with the direction of the absolute reference line (L'). In this way, the coordinates on the floor plan of the building coincide with the coordinates in the real world, that is, the absolute coordinates in the plane Cartesian coordinate system. 27 shows the outline of the building in this rotated state. In this state, the relative reference point and endpoint coincide with the absolute reference point and endpoint.

However, instead of matching the relative reference point with the absolute reference point, and the relative end point with the absolute end point, the reason why the floor plan or outline of the building is rotated around the reference point so that the direction of the relative reference line coincides with the direction of the absolute reference line is as follows. . In practice, errors cannot be avoided when creating ground floor plans for buildings or measuring GPS coordinates of base and end points. Therefore, it is virtually impossible to move or rotate the relative reference point and end point exactly to the absolute reference point and end point. On the other hand, it is always possible to select a reference point that can be most accurately located and rotate the floor plan of the building around the reference point so that the direction of the relative reference line coincides with the direction of the absolute reference line. Therefore, assuming the error of measurement, this method is the most consistent way to match the coordinates on the floor plan of the building and the absolute coordinates on the plane Cartesian coordinate system as much as possible.

After the steps up to this point are completed, if all other drawing elements such as the base point, end point, and base line are deleted, the plan view with the coordinates of the plane Cartesian coordinate system is completed. AutoCAD files have the extension dwg, which is Autodesk's proprietary format. However, if AutoCAD files are saved in dxf format, they are compatible with other programs.

28 is a screen showing a floor plan file stored in dxf format opened in QGIS, a map-related open source SW. At the bottom right of the QGIS screen, the projection method is displayed as EPSG:5186. In EPSG:5186, you can see that the shape of the outline of the OK Venture Town building is accurately displayed without distortion. A 1st corner point is located at the top right of this building, and a small circle is marked on this ^1st corner point for identification. When the mouse is placed on this first corner point, the coordinates are displayed as '414737.53,238323.92' at the bottom of the QGIS screen.

In QGIS, you can save this floor plan file back as a GeoJSON file, and you can specify the geographic coordinate system (EPSG:4326) as the coordinate system. Since the GeoJason file is a text file, it can be opened with a text editor program such as notepad. The file is given as

{ "type": "Feature", "properties": { "Layer": "Bld", "PaperSpace": null, "SubClasses": "AcDbEntity:AcDbPolyline", "Linetype": null, "EntityHandle": "5593 ", "Text": null }, "geometry": { "type": "LineString", "coordinates": [ [ 127.4267398, 36.329933 ], [ 127.4267363, 36.3299179 ], [ 127.426709, 36.329922 ], [ 127.42 6686, 36.3298219] . 65563, 36.3297354 ], [ 127.4265514, 36.3297141 ], [ 127.4266375, 36.3297012 ], [ 127.4266434, 36.3297269 ], [ 127.4267069, 36.3297174 ], [ 127.4267218, 36.3297824 ], [ 127.4268286, 36.329793 ], [ 127.4268322, 36.3299191 ], [ 127.426739 8, 36.329933 ] } }

That is, this floor plan file is given as a feature object, and the coordinates of each point are stored in the form of [longitude, latitude].

29 is a screen showing the outline of the OK Venture Town building extracted from the numerical map and the outline obtained by actual measurement opened in QGIS. The location of the buildings is almost the same, but it can be seen that the outline of the building obtained by actual measurement is much more accurate than the outline of the building extracted from the digital map. As a result of various estimations, the position error of the OK Venture Town building outline was calculated to be about 8 cm.

30 is a view showing the outline of the OK Venture Town building obtained by actual measurement after loading VWorld street from QGIS. The V-World map uses the same spherical Mercator projection method as Google Maps (EPSG:3857). Therefore, the building outline drawing of the OK Venture Town building is converted back from the geographic coordinate system (EPSG:4326) to the spherical Mercator projection method (EPSG:3857) and displayed.

30, it can be seen that the location of the building coincides well with the boundary of the road. When tested on other maps such as Naver Map or Kakao Map, it can be seen that the deviation of the location of the building relative to the road is quite large. This may be because the location accuracy of the outdoor map is considerably lowered as described above.

In the first embodiment of the present invention, only the outline of the building has been described, but the method of converting an actual floor plan of a building as shown in FIG. 18 into an indoor map is the same.

The first embodiment of the present invention provides a method of creating an indoor map of a floor of a building using a GPS (Global Positioning System) receiver and CAD (Computer Aided Design) software. This method is a step of preparing a CAD drawing containing a floorplan of any one floor of a building in a local coordinate system having a unit of distance, a reference point relatively fixed with respect to the building. Setting a reference point and reference line, determining the coordinates of the reference point and the direction of the reference line in a plane rectangular coordinate system using a GPS receiver, the coordinates of the determined reference point and the direction of the reference line A step of converting the local coordinate system of the CAD drawing into a planar Cartesian coordinate system using , and a step of converting the coordinates on the plan view from the coordinates of the Plane Cartesian coordinate system to the coordinates of the geographic coordinate system.

The step of preparing a CAD drawing containing a floor plan of any one floor of a building in a local coordinate system with a unit of distance is to set a fixed point relative to the building as the origin of the coordinate system using the metric system. Step of selecting a floor plan, step of selecting a floor of a building to create a floor plan for, preparing a CAD drawing including a floorplan that includes the building outline of the floor as connected line segments or polygons It includes steps to

The step of setting a relatively fixed reference point and reference line for the building is the step of selecting two points on the outer wall of the building, the step of selecting the reference point and end point separated from the two points on the outer wall by a certain distance from the building, respectively, the reference point and the end point and setting a reference line connecting the

The step of determining the coordinates of the reference point and the direction of the reference line in the Cartesian Plane Coordinate System using the GPS receiver is the step of obtaining the location information of the reference point and the end point as the coordinates of the Cartesian Plane Coordinate System using the GPS receiver. and calculating the direction of the baseline.

The step of converting the local coordinate system of the CAD drawing into a plane Cartesian coordinate system using the coordinates of the determined reference point and the direction of the reference line is the step of adding a relative reference point, end point, and reference line having local coordinates of the origin to the CAD drawing, obtained by a GPS receiver. The step of adding an absolute reference point and end point having coordinates in a plane Cartesian coordinate system to the CAD drawing, the step of adding an absolute reference line connecting the absolute reference point and the end point, and moving the reference point and end point and reference line relative to the plan view in the CAD drawing Making the relative reference point coincide with the absolute reference point, and rotating the plan view, the relative reference point, the end point, and the reference line together around the relative reference point so that the direction of the relative reference line coincides with the direction of the absolute reference line in the CAD drawing.

The step of converting the coordinates on the floor plan from the coordinates of the planar Cartesian coordinate system to the coordinates of the geographic coordinate system is the step of deleting the drawn elements other than the floor plan from the CAD drawing, and converting the CAD drawing into a GeoJSON file. , but the projection method includes the step of following the geographic coordinate system.

In the conventional invention disclosed in [Special 3], one building outline file (Bld.geojson) and each floor plan file were used for each building. OK Venture Town as an example is a so-called box-shaped building, and each floor of the building has the same cross-section. However, not a small number of buildings have different cross-sections for each floor.

31 is a picture of the Lotte world tower, which is the fifth tallest building in the world as of 2022. This building embodies the tip of a brush, and has a shape in which the cross-sectional area decreases as it goes up. Therefore, the outline of this building is inevitably different for each floor.

In the conventional invention of [Special 3], the GPS coordinates obtained by the GPS receiver of the user's smartphone or the location of the mouse cursor are used to determine whether the cursor of the user's smartphone or mouse is located inside the building. It was checked whether it was located inside or outside the outline of . However, if only one outline for each building, for example, the outline of a ground floor, is used as in the prior art, the corresponding algorithm may cause an error. Because, if the location of the smartphone or mouse cursor is located within the outline of the ground floor and is located outside the outline of the high floor or the floor plan, the map program determines that it is indoors even though it is not actually located inside the building, and selects the floor menu because it can show

Most buildings have the same cross-section along the height, or they get smaller. However, the Seoul National University Central Library shown in FIG. 32 is a structure with an additional building added later in addition to the existing building built on the hillside, and there is another building on top of one building. In the second library built, the cross-sectional area of the upper floor is larger than the cross-sectional area of the lower floor. Therefore, in this case, a serious error may occur in which the floor selection menu does not appear even though the center marker is clearly located in the building.

To prevent such an error, in the second embodiment of the present invention, a floor plan and a building outline drawing are used for each floor of all buildings including box-shaped buildings. 33 shows a configuration of a map object as a part of JavaScript code written in OpenLayers grammar.

In this embodiment, the initial values of the center, rotation, and zoom level of the map screen are not directly specified, but parameters such as goal location goal_xy, goal rotation goalRotation, and goal zoom goalZoom ) is used. And, before creating the map object, initial values are given to the target position, target rotation, and target zoom parameters.

The layer of map object is composed of baseLayer, buildingLayer, buildingLabelLayer, floorplanLayer, spaceLabelLayer, unitAreaMarkLayer, and locationMarkerLayer. Layers that are declared first are drawn first, so baseLayer is at the bottom and locationMarkerLayer is at the top. baseLayer is a layer that receives map tiles from OpenStreetMap as picture files and draws an outdoor map. The baseLayer is a raster layer, and all others are vector layers.

unitAreaMarkLayer is a layer for displaying a unit area, and locationMarkerLayer is a layer for displaying a user's location or compass on a map. Except for baseLayer, unitAreaMarkLayer, and locationMarkerLayer, the remaining layers form a terrain features (geographic features, terrain features) layer group. Among them, buildingLayer is a layer for drawing a building outline per level, and floorplanLayer is a layer for drawing a plan view of any one floor among floorplans per level of a building.

buildingLabelLayer is a layer for displaying key information related to the building, such as the building name or homepage address, and spaceLabelLayer is a layer for showing the business name or room name of individual spaces shown on the floor plan. am. For example, each room can be a single space.

Table 2 shows the names of the outline file and the floor plan file, as well as the name and path of the folder where the files are stored, assuming a three-story building, OK Venture Town.

indoor map common path building folder subfolder indoor map file Representative outline drawing https://www.buildings.land/datastoreIndoorMap/ N14062971E27570403 Bld Bld.geojson 1st floor outline drawing " " " G.geojson 2nd floor outline drawing " " " F1.geojson 3rd floor outline drawing " " " F2.geojson 1st floor plan " " L0 G.geojson 2nd floor floor plan " " " F1.geojson 3rd floor floor plan " " " F2.geojson

The common path is given as 'https://www.buildings.land/datastoreIndoorMap/', and the individual folder names of OK Venture Town in it are (geodetic) of the building's centroid. It is given as 'N14062971E27570403' from latitude and longitude. However, building outline drawing files and floorplan files are not directly stored in this individual folder, but a subfolder (Bld) in which outline drawing files are stored and a subfolder (L0) in which floor plans are stored is separate. All four building outline drawing files (Bld.geojson, G.geojson, F1.geojson, F2.geojson) are stored in the Bld folder, and all three floor plan files (G.geojson, F1.geojson, F2.geojson) are stored in the Bld folder. It is saved in the L0 folder.

The first, second, and third floor outline drawing files and floor plan files have the same name. However, the outline drawing file is saved in the Bld folder in the data storage and uploaded to buildingLayer, and the floor plan file is saved in the L0 folder in the data storage and uploaded to floorplanLayer. So there is no confusion in handling indoor map files.

Here, the reason why Bld.geojson, a representative building outline drawing, exists separately in addition to the building outline drawing per level is as follows. In the conventional invention disclosed in [Special 3], while the city center of a building is located in the view and the zoom level of the map is greater than the zoom level for showing building outline zoomShowBld, the building outline drawing is always displayed on the buildingLayer, and if the zoom is greater than the zoom level for showing floorplan zoomShowFloor, the floor plan of the floor selected by the user is additionally displayed on the floorplanLayer. And floor selection only replaces the floor plan, not the building outline drawing.

On the other hand, in the second embodiment of the present invention, the outline drawing (G.geojson) of the ground layer (G) is added to the map layer group and removed at the same time as the plan view (G.geojson) of the ground layer in the L0 folder, 2 The same applies to the layer (F1) and the third layer (F2). That is, when the floor is changed, the outline drawing and floor plan of each floor of the building are simultaneously replaced.

However, the representative outline drawing (Bld.geojson) is infinite ( ∞) This is the outline of the building shown when selecting a floor. When the floor selector displays 'select floor', internally the program considers the number of floors in the building to be infinite.

The representative outline drawing is a copy of the building outline drawing of the ground floor if the building has a ground floor. In the case of a building without a ground floor, such as an underground shopping mall, it is the outline drawing of the floor closest to the ground surface, that is, the first basement floor.

In addition, in the case of an underground shopping mall, the floor plan of the basement floor is not visible at the start of the map, and only the representative outline drawing is displayed. When the user selects the basement floor, the representative outline drawing is removed, and the outline drawing and floor plan of the floor selected by the user are displayed.

In other words, in the second embodiment of the present invention, when the floor is changed from the first floor to the second floor using the floor selection menu, the building outline drawing file (Bld/G.geojson) and the floor plan file (L0/G.geojson) of the first floor are It is replaced with the 2nd floor building outline drawing file (Bld/F1.geojson) and floor plan file (L0/F1.geojson), and the floor selection menu is activated only when the center marker exists within the outline drawing of each floor. And when there is no floor plan to show, a representative outline drawing is displayed.

34 is shown when the floor is changed to 'select floor' in the floor selector with the center of the view located within the building outline of the ground floor (1st floor) of OK Venture Town It is a losing map. That is, if no floor is selected in the floor selection menu, only 'select floor' is displayed.

The outline drawing of the representative building shown in FIG. 34 is created as a GeoJSON file. The building at the view center shown in FIG. 34, that is, the outline drawing (Bld.geojson) of the representative building of OK Venture Town is given as follows.

{

"type": "FeatureCollection",

"name": "OK Venture Town",

"crs": {

"type": "name",

"properties": {

"name": "urn:ogc:def:crs:OGC:1.3:CRS84"

}

},

"features": [{

"type": "Feature",

"properties": {

"bldID": 1,

"bldName": "OK Venture Town",

"strokeColor": "rgba(255, 0, 0, 1)",

"strokeWidth": 2,

"strokeLineDash": [4, 10],

"fillColor": "rgba(255, 124, 0, 0.3)"

},

"geometry": {

"type": "MultiPolygon",

"coordinates": [ [ [ [ 127.42673979, 36.32993296 ], [ 127.42673634, 36.32991789 ], [ 127.42670896, 36.329922 ], [ 127.42668601, 36.329821 88 ], [ 127.42666849, 36.32982451 ], [ 127.4266565, 36.32977223 ], [ 127.42655466, 36.32978752 ], [ 127.42654317, 36.32973737 ], [ 127.42655631, 36.32973539 ], [ 127.42655143, 36.32971413 ], [ 127.4266375, 36.32970121 ], [ 12 7.4266434, 36.32972691 ], [ 127.42670691, 36.32971737 ], [ 127.42672181, 36.32978236 ], [ 127.42682863, 36.32979296 ], [ 127.42 683222; 36.32991908 ], [ 127.42673979, 36.32993296 ] ] ] ]

}

}]

}

As you can see here, the building outline drawing is a GeoJason object, and we will call it a building object. Although the building object is defined as a feature collection object, there is actually only one feature object included in it. This building object has a type item, a name item, a crs item, and a feature object item. Therefore, if this building object is called building, the building name can be obtained as building.name. The crs item has a type item and a property item again, and the property item has a name item again.

The features item of the building object has a type item, properties item, and geometry item again. The properties item again has a building ID (bldID) item, a building name (bldName) item, a line color (strokeColor) item, a line width (strokeWidth) item, a line type (strokeLineDash) item, and a face color (fillColor) item. there is. The geometry item of the features item has a type item and a coordinates item again, and the value of the type item is MultiPolygon.

This property object (feature) item can be obtained with feature = building.features[0], and the value of the building ID (bldID) item of this property object item can be obtained with bldID = features.properties.bldID.

This method uses pure JavaScript syntax to check the unique building identification number (ie, building ID) given to the building object. Using OpenLayers, bldID = building.getProperties().bldID and can be obtained together.

34 is a case where 'select floor' is deliberately selected from the floor selector. Meanwhile, FIGS. 35 to 37 show cases in which the floor is changed to a first floor (G), a second floor (F1), and a third floor (F2), respectively. 35 to 37, it can be seen that the colors of the outlines of the buildings are all different, because the outlines of the buildings are also replaced together with the floor plan.

A method for selecting a layer in FIGS. 34 to 37 is as follows. First, the view extent is obtained. Then, the coordinates of the center of the view, _view_xy, are obtained from this view range. Since the center marker is at the center of the view, _view_xy is the coordinates of the center of the center marker. Next, building objects existing at these coordinates are obtained from the buildingLayer. Using the syntax of OpenLayers, it can be obtained as follows.

buildings = sourceBuildings.getFeaturesAtCoordinate(_view_xy);

Here, sourceBuildings is a variable that has building outline drawings displayed on buildingLayer, that is, building objects. That is, building outline drawings added to sourceBuildings are displayed in buildingLayer.

If the size of buildings is greater than 0, that is, if there is more than one building object, the command building = buildings[0] selects the first building. Next, the bldID = building.getProperties().bldID command is used to obtain the ID (bldID) of the building. The building ID can be obtained in this way because, of course, the building ID (bldID) is included in the properties item of the features item of the building object. If the building ID is obtained in this way, all necessary information such as the path of the building outline drawing file or the zoom level of the floor plan can be obtained by querying the building database.

In the indoor maps of Madison Square Garden shown in FIGS. 6 to 8, elevators, toilets, and stairs are represented by icons, and walls are represented by only lines. While it may convey the necessary information, it cannot be denied that the floor plan shown in Figure 18 is more aesthetically pleasing and easier to recognize.

As shown in FIG. 18, expressing the wall exactly as the measured value can be very important in an emergency situation. For example, when a fire breaks out in a building, not only visibility is restricted due to thick smoke, but also life is threatened due to the generation of toxic gas. Therefore, in order to evacuate or rescue as quickly as possible, it is very important to know what the interior structure of a building is, which walls are load-bearing walls and which are non-bearing walls, and what the position and size of doors and windows are.

In this way, in order to create an indoor map based on measured values, it is convenient to use both polygons and connected line segments. In addition, it is more preferable to directly manage room numbers or room names such as living room, bedroom, and bathroom in the database rather than specifying them as point objects.

38 shows an indoor map of the second floor of OK Venture Town in the third embodiment of the present invention, and FIG. 39 is an enlarged screen of the map near the applicant's office. As you can see, the wall thickness is not constant, and it has been used for a variety of things, from thick load-bearing walls to non-bearing walls that are merely partitions. These thicknesses were expressed proportionally by measuring the actual wall thickness, and the size and shape of the door or window were also drawn as closely as possible to the actual one. For example, looking at Figure 39, it can be seen that the window is a double sliding window, and the entrance door is a single casement door that opens into the office.

The walls are expressed in black, but all the walls are expressed as polygons and the face color is specified as black. In addition, all hinged doors are expressed as polygons, so that the direction in which the door opens can be clearly seen. On the other hand, windows, toilet bowls, and stairs are all expressed as connected line segments. The floor plan objects of the second floor of this OK Venture Town are as follows.

{

"type": "FeatureCollection",

"name": "F1",

"crs": {

"type": "name",

"properties": { "name": "urn:ogc:def:crs:OGC:1.3:CRS84" } },

"features": [{ "type": "Feature", "properties": { "Layer": "wall", "bldID": 1, "strokeColor": "rgba(0, 0, 0, 1)", "strokeWidth": 1, "fillColor": "rgba(0, 0, 0, 1)", "floor": "F1" }, "geometry": { "type": "MultiPolygon", "coordinates": [ [ [ [ 127.42678864, 36.32992563 ], [ 127.42678811, 36.32992332 ], [ 127.42678285, 36.32992411 ], [ 127.42678338, 36.32992642 ], [ 127.42678864, 36.32992563 ] ] ] } },

... omitted ...

{ "type": "Feature", "properties": { "Layer": "door", "bldID": 1, "strokeColor": "rgba(255, 124, 0, 1)", "strokeWidth": 1 , "fillColor": "rgba(255, 255, 204, 1)", "floor": "F1" }, "geometry": { "type": "MultiPolygon", "coordinates": [ [ [ [ 127.42662865, 36.32972289 ], [ 127.42662744, 36.32971757 ], [ 127.42662744, 36.32971757 ], [ 127.42662699, 36.32971765 ], [ 127.42662655, 3 6.32971775 ], [ 127.42662612, 36.32971788 ], [ 127.42662571, 36.32971803 ], [ 127.42662531, 36.32971821 ], [ 127.42662492, 36.3 297184] . 127.42662328, 36.32971967 ], [ 127.42662302, 36.32971998 ], [ 127.42662279, 36.3297203 ], [ 127.42662258, 36.32972063 ], [ 127.42662241, 36.32972097 ], [ 127.42662226, 36.32972132 ], [ 127.42662214, 36.32972167 ], [ 127.42662206, 36.32972203 ], [ 1 27.426622, 36.3297224 ], [ 127.42662197, 36.32972277 ], [ 127.42662198, 36.32972314 ], [ 127.42662202, 36.32972351 ], [ 127.426 62208; 36.32972387 ], [ 127.42662865, 36.32972289 ] ] ] ] } }

... omitted ...

{ "type": "Feature", "properties": { "Layer": "structure", "bldID": 1, "strokeColor": "rgba(124, 124, 124, 1)", "strokeWidth": 1 , "fillColor": "rgba(255, 0, 0, 1)", "floor": "F1" }, "geometry": { "type": "LineString", "coordinates": [ [ 127.42671949, 36.32990567 ] , [ 127.42671386, 36.3298811 ] ] } },

... omitted ...

{ "type": "Feature", "properties": { "Layer": "window", "bldID": 1, "strokeColor": "rgba(0, 255, 255, 1)", "strokeWidth": 2 , "fillColor": "rgba(255, 0, 0, 1)", "floor": "F1" }, "geometry": { "type": "LineString", "coordinates": [ [ 127.42655125, 36.32976782 ] , [ 127.42654998, 36.32976228 ], [ 127.42654871, 36.32975674 ] ] } }

]}

As can be seen from the above, the floor plan object is a feature collection, and has a type item, a name item, a crs item, and a feature object item. This feature object includes a number of feature objects, and each feature object has a type, properties, and geometry items. The properties of each feature object are Layer, bldID, strokeColor, strokeWidth, fillColor, and layer. (floor). The value of the floor item of all feature objects belonging to the floor plan object of the second floor of OK Venture Town is given as "F1".

The value of the layer item is any one of wall, door, structure, and window, and the purpose of this layer item is for floor plan design reference. In addition, the value of the type item of the geometry item is any one of MultiPolygon, LineString, and MultiLineString. That is, Point or MultiPoint is not used, and even a single polygon is regarded as a multi-polygon with 1 element.

The properties item of the property object (feature) can be queried using the above-described JavaScript syntax or OpenLayers function. In fact, all items can be queried, but the properties (attributes) that need to be directly queried in the digital map program are included in the attribute items. Items included in this property item will be referred to as queryable properties.

Among the properties that can be inquired, the building ID (bldID) is necessary to determine to which building the property objects constituting the plurality of floor plans shown in the view belong. The floor is not required, but may be used for other purposes. Attributes such as line color (strokeColor), line width (strokeWidth), line type (strokeLineDash), and face color (fillColor) are used to beautifully render a floor plan. In the plan view shown in FIG. 38, geometric objects with the same layer have the same value of property items such as line color, line width, line type, and surface color. The face color item assigned to a connecting line segment object or multi-connected line segment object is ignored, and the face color assigned to a multi-polygon object is designated as the face color of the polygon.

In FIG. 9, since styles are defined in advance for polygons, connecting segments, and points, figures can be expressed only in a uniform manner. However, since it is impossible to meet the tastes of the building owner or the tenant in a uniform way, the property items of the floor plan object include line color (strokeColor), stroke width (strokeWidth), line type (strokeLineDash), and face color (fillColor). item was added. A method of processing an attribute item embedded in such a floor plan object is disclosed in FIGS. 40 to 41 .

Referring to FIG. 40, the floorplan layer constant (const) floorplanLayer is newly created as a vector layer in OpenLayers (new ol.layer.Vector()). The source of this layer has the name sourceFloorplan, and this source was also created as a vector layer before the floor plan layer constant in OpenLayers. And the style of this floor plan layer is designated as floorplanStyle, which is not a constant but a function.

41 shows the code of the floorplanStyle function. When this function is called, the feature is passed to the function as an input variable. When a floor plan object is added to sourceFloorplan, the features of the floor plan object are extracted and passed to the input variable of this floorplanStyle function.

The value corresponding to the strokeColor item is extracted from this feature (feature.get("strokeColor")) and stored in a variable called strokeColor. If the value corresponding to the line color item is not stored in the property object (feature) (strokeColor == undefined), a default value is assigned to the strokeColor variable. The default is gray (rgba(124, 124, 124, 1.0)).

Similarly, the values of line type (strokeLineDash), line width (strokeWidth), and face color (fillColor) are extracted from the feature and stored in variables called strokeLineDash, strokeWidth, and fillColor, respectively. If there is no value stored in fillColor, the default value of black (rgba(0, 0, 0, 1.0)) is specified.

In this way, if the values are stored in the strokeColor, strokeLineDash, strokeWidth, and fillColor variables, a new variable named style is created (new ol.style.Style()), and the color, type (lineDash), and width of the line are created. (width) is set as strokeColor, strokeLineDash, and strokeWidth, respectively. Also, the color of the fill is specified as fillColor. Finally, the style created in this way is returned as the value of the function (return styles).

Using this function, the line color of a line segment or polygon can be specified by reading the strokeColor property value included in the building object, and each building owner or tenant can use the preferred color for each building. Similarly, the line width is obtained from strokeWidth, the line type is obtained from strokeLineDash, and the polygon face color is obtained from fillColor. If there is no value, the default value is used. Using this method, a floor plan can be expressed by applying different styles for each building and each floor, so there is no need to use a uniform style.

A detailed floor plan like that of the third embodiment cannot be displayed on a digital map when the zoom level is small. Because you won't find out anything. Therefore, it is preferable to show the floor plan based on actual measurement as in the third embodiment when the zoom level of the digital map is much larger than the zoom level of the floor plan display of the building. When it is inappropriate to show a detailed plan view of , it is preferable to show a simplified plan view such as the plan view of Example 2. 42 to 49 show examples of such step-by-step plan view display.

In FIG. 42, when the zoom of the digital map is small (zoom = 17), OK Venture Town and its nearby buildings are not visible. The reason why the outline of the Daejeon Jungang-ro Underground Shopping Mall shown below is visible is that the zoom level of the building outline display is much smaller.

In FIG. 43, as the zoom of the digital map becomes larger (zoom = 18), the outlines of OK Venture Town and three buildings around it are shown. In Fig. 44, as the zoom becomes larger (zoom = 19), the name of the building is shown in the centroid of the building. In Fig. 45, as the zoom becomes larger (zoom = 20), the simplified top views shown in Example 1 are shown. 45 shows room numbers on the ground floor (1st floor) of OK Venture Town. The reason why only one room number is shown in FIG. 45 is that there is only one room to which a room number is assigned on the ground floor.

As the zoom becomes larger in FIG. 46 (zoom = 21), a detailed plan view like Example 3 is shown. In Fig. 47, as the zoom becomes larger (zoom = 22), the name of the room is shown, not the room number. As the zoom of the digital map becomes larger in FIGS. 48 and 49 (zoom = 24), a more detailed plan view than that of Example 3 is shown. That is, in the fourth embodiment of the present invention, in addition to the representative outline drawing of the building and the outline drawing for each floor, three sets of step-by-step floor plans are used for each floor.

Table 3 shows the building outline drawing and floor plan files and the folder structure in which the files are stored in the fourth embodiment of the present invention.

step indoor map common path building folder subfolder indoor map file outline drawing Representative outline drawing https://www.buildings.land/datastoreIndoorMap N14062971E27570403 Bld Bld.geojson 1st floor outline drawing " " " G.geojson 2nd floor outline drawing " " " F1.geojson 3rd floor outline drawing " " " F2.geojson step 0 1st floor plan " " L0 G.geojson 2nd floor floor plan " " " F1.geojson 3rd floor floor plan " " " F2.geojson Step 1 1st floor plan " " L1 G.geojson 2nd floor floor plan " " " F1.geojson 3rd floor floor plan " " " F2.geojson Step 2 1st floor plan " " L2 G.geojson 2nd floor floor plan " " " F1.geojson 3rd floor floor plan " " " F2.geojson

Although three sets of floor plans are used in the fourth embodiment of the present invention, a method of using two sets or four sets is also possible. Here, the name of the plan view of step 0, the name of the plan view of step 1, and the name of the plan view of step 2 are all the same. The floor plan for step 0 is in the L0 folder, the floor plan for step 1 is in the L1 folder, and the floor plan for step 2 is in the L2 folder. The plan view of step 1 is more detailed than the plan view of step 0, and the plan view of step 2 is more detailed than the plan view of step 1.

Table 4 summarizes the way labels and indoor maps are displayed according to zoom level.

zoom zoom value label indoor map display doesn't exist doesn't exist zoomQueryingBuildingTable 15 doesn't exist doesn't exist zoomShowBld 18 doesn't exist building outline drawing zoomShowBldLabel 19 building name building outline drawing zoomShowFloor/zoomShowSpaceNo 20 room number Building outline drawing + L0 floor plan zoomShowFloorL1 21 room number Building outline drawing + L1 floor plan zoomShowSpaceName 22 room name " zoomShowFloorL2 23.5 room name Building outline drawing + L2 floor plan

If the zoom level of the digital map is lower than zoomQueryingBuildingTable, the building search operation in the database is not performed at all. If the zoom level of the digital map is 15 or higher, which is the value of zoomQueryingBuildingTable, buildings within the view range are searched. The database is searched for buildings in the view range, and values such as zoomShowBld and zoomShowBldLabel are searched for buildings and stored in local variables. If the zoom level of the digital map is higher than zoomShowBld, the building outline drawing is displayed, and if it is higher than zoomShowFloor, the floor plan of step 0 is displayed in addition to the building outline drawing. When the zoom level is greater than zoomShowFloorL1, the floor plan of stage 0 is removed and the floor plan of stage 1 is displayed. When the zoom level returns to zoomShowFloorL2 or higher, the floor plan of step 1 is removed and the floor plan of step 2 is displayed.

Separately, when the zoom level of the digital map is greater than zoomShowBldLabel, the building name is displayed, but when the zoom level is greater than zoomShowSpaceNo, the building name is removed and the room number is displayed, and when the zoom level is greater than zoomShowSpaceName again, the room number is displayed. is removed, and the room name is displayed instead.

A digital map system incorporating the inventions of the second to fourth embodiments of the present invention is a computer program stored in a medium that integrally displays an outdoor map and an indoor map on a user terminal. includes User terminals include smart phones and computers. This system consists of a user terminal, an outdoor map server, a data store that manages indoor map drawings of buildings in individual folders for each building, and an outdoor map. A building database that manages map setting data for displaying an indoor map of buildings at the correct location on the outdoor map, and a digital map is executed in the user terminal It includes a web server including a recording medium on which a computer program required to be used is stored.

The indoor map drawing of each building is a representative building outline drawing, which is a copy of the building outline drawing per level and the building outline drawing of the ground floor or the floor closest to the ground floor. outline drawing, and n sets of floorplans per level. Here, n is a natural number, and two or more floor plans for each floor have different zoom level intervals of the digital map displayed on the user terminal.

Outline drawings of each floor of buildings are given as GeoJSON objects. We refer to this object as a building object. A building object is given as a feature or feature collection containing one polygon, and queryable properties of the building object include a building ID.

n sets of floor plans of each floor of the building are also given as a GeoJSON object, which is referred to as a floorplan object. A floor plan object is given as a Feature or FeatureCollection containing one or more polygons or connected line segments, and the queryable properties of the floor plan object are building ID and floor. and, stroke color, stroke width, line type (strokeLineDash), and fill color. A computer program that drives the digital map system queries the properties of a floor plan object and renders a floor plan with those properties.

The digital map system executes a series of stages to display the outdoor map and the indoor map integrally. The series of steps starts with the initial map settings, displays the outdoor map in the view of the digital map, and zooms, pans, and rotates by the user. Updating the outdoor map shown in the view according to the view, if the zoom level of the digital map is higher than a preset threshold zoom value, the building database is searched and the view extent building list ), including the step of writing.

If the number of buildings in the view range building list is greater than 0, the representative outline drawings of the buildings whose zoom level of the digital map is greater than the zoom level for showing building outline are imported from the building data storage and displayed outdoors. Mark the right location on the map, and among the buildings on which the representative outline drawing is displayed, the zoom level of the digital map is greater than the zoom level for showing floorplan of the building and a list of buildings with a ground floor is created. This list is referred to as floorplan to show building list floorplanIDsToShow.

Next, remove the representative outline drawing of the building in the list of buildings to be displayed on the floor plan, and import the building outline drawing of the ground floor and the floor plan of the ground floor that corresponds to the zoom level of the digital map from the building data storage to determine the correct location on the outdoor map. display on

When the zoom level of the digital map is changed by the user's zoom action, the zoom level of the digital map and the zoom level range of the ground floor plan are compared, and the zoom level of the digital map and the zoom level range of the ground floor plan do not match. If not, the floor plan of the ground floor is removed, and the floor plan of the ground floor corresponding to the zoom level of the digital map is fetched from the building data storage and displayed according to the building outline of the ground floor.

The series of steps further includes executing a floor selection subroutine. The floor selection subroutine checks whether there is a central building, if so, checks whether the central building has a basement or a multi-story building, displays a menu for selecting a floor if the central building has a basement or a multi-story building, If the user selects a floor different from the current floor, removing the outline drawing of the currently displayed central building, removing if the current floor plan of the central building is displayed in the view, removing the selected central building The step of importing the building outline drawing of the floor from the data store and displaying it at the correct location on the outdoor map, among the floor plans of the selected floor of the central building, the floor plan that corresponds to the zoom level of the digital map is imported from the data storage and the building outline of the selected floor It includes the step of marking in accordance with the drawing.

By superimposing a floor plan based on actual measurements on an outdoor map, people can easily grasp related information, so it can be used for directions in department stores, shopping malls, airports, subways, sales advertisements for apartments, room information in hotels and motels, fire It can be used as a map for rescue and escape in case of disaster.

N: northbound street
E: eastward distance
I: Integer corresponding to northbound distance
J: Integer corresponding to eastward distance
F: floors above ground floor
G: ground layer
B: Basement

Claims (13)

In the method of creating an indoor map of a floor of a building using a GPS (Global Positioning System) receiver and CAD (Computer Aided Design) software,
Preparing a CAD drawing including a floorplan of any one floor of a building in a local coordinate system having a unit of distance;
Setting a relatively fixed reference point and reference line with respect to the building;
Determining the coordinates of the reference point and the direction of the reference line in a plane rectangular coordinate system using a GPS receiver;
converting the local coordinate system of the CAD drawing into a plane Cartesian coordinate system using the coordinates of the determined reference point and the direction of the reference line;
Characterized in that it comprises the step of converting the coordinates on the plan view from the coordinates of the plane rectangular coordinate system to the coordinates of the geographic coordinate system,
How to create an indoor map of any one floor of a building.
According to claim 1,
Preparing a CAD drawing including a plan view of any one floor of a building in a local coordinate system having a unit of distance;
Selecting a relatively fixed point with respect to the building as the origin of a coordinate system using a metric system;
Selecting a floor of a building to create a floor plan;
Characterized in that it comprises the step of preparing a CAD drawing including a floorplan including the building outline of the floor as connected line segments or polygons,
How to create an indoor map of any one floor of a building.
According to claim 1,
Setting relatively fixed reference points and reference lines with respect to the building;
Selecting two points on the outer wall of the building;
Selecting a reference point and an endpoint spaced apart from the building by a certain distance from two points on the outer wall of the building,
Characterized in that it comprises the step of setting a reference line connecting the reference point and the end point,
How to create an indoor map of any one floor of a building.
According to claim 3,
The step of determining the coordinates of the reference point and the direction of the reference line in the plane Cartesian coordinate system using the GPS receiver;
Acquiring location information of a reference point and an end point as coordinates of a plane Cartesian coordinate system using a GPS receiver;
Comprising the step of calculating the direction of the reference line with respect to the coordinate axis of the plane Cartesian coordinate system,
How to create an indoor map of any one floor of a building.
According to claim 3,
The step of converting the local coordinate system of the CAD drawing into a planar Cartesian coordinate system using the coordinates of the determined reference point and the direction of the reference line;
Adding a reference point - hereinafter referred to as a relative reference point - and an end point - hereinafter referred to as a relative endpoint - and a reference line - hereinafter referred to as a relative reference line - having local coordinates with respect to the origin to the CAD drawing;
Adding a reference point - hereinafter referred to as an absolute reference point - and an end point - hereinafter referred to as an absolute reference point - having coordinates in the plane Cartesian coordinate system obtained by the GPS receiver to the CAD drawing;
Adding absolute reference lines connecting absolute reference points and endpoints;
In the CAD drawing, moving the relative reference point, end point, and reference line together with the plan view so that the relative reference point coincides with the absolute reference point;
Rotating the plan view, the relative reference point, the end point, and the reference line together around the relative reference point so that the direction of the relative reference line in the CAD drawing coincides with the direction of the absolute reference line.
How to create an indoor map of any one floor of a building.
According to claim 3,
The step of converting the coordinates on the plan view from the coordinates of the planar Cartesian coordinate system to the coordinates of the geographic coordinate system;
The step of deleting the remaining drawing elements (作圖要素, drawn elements) from the CAD drawing,
Saving the CAD drawing as a GeoJSON file, characterized in that it includes the step of making the projection method follow the geographic coordinate system,
How to create an indoor map of any one floor of a building.

a user terminal; and
an outdoor map server;
A data store that manages indoor map drawings of buildings in individual folders for each building;
A building database that manages map setting data for displaying an indoor map of buildings at the correct location on the outdoor map;
A web server including a recording medium in which a computer program necessary for executing a digital map in a user terminal is stored,
The indoor map drawing of each building is;
A building outline drawing per level;
A representative building outline drawing, which is a copy of the building outline drawing of the ground floor or the floor closest to the ground floor;
Including n sets of floorplans per level,
where n is a natural number,
For floor plans with two or more sets per floor, the interval of the zoom level of the digital map displayed on the user terminal is different,
The outline drawing of each floor of the buildings is given as a GeoJSON object - hereinafter referred to as a building object -
A building object is given as a feature or feature collection containing a single polygon,
Characterized in that the queryable properties of the building object include a building ID,
A digital map system including a computer program stored in a medium that integrally displays an outdoor map and an indoor map on a user terminal.
According to claim 7,
A full path to an individual folder includes a common path and an individual folder name,
The individual folder name is given in the following format with one character string P corresponding to the geodetic latitude and longitude of the representative location of the building,

where N, E,

,

are identification characters representing northing, easting, northing corresponding integer and easting corresponding integer, respectively;
The curly brackets {} are symbols to replace the curly brackets with the actual value corresponding to the identifying character within them,
The northbound distance N is given by

where R is the average radius of the Earth,
The unit of angle is radian,
The eastward distance E is given by

Northbound Distance Corresponding Integer

and equidistant distance corresponding integer

Is a natural number obtained by rounding off the northward distance N and the eastward distance E, respectively.
A digital map system including a computer program stored in a medium that integrally displays an outdoor map and an indoor map on a user terminal.
delete According to claim 7,
n sets of floor plans of each floor of buildings are given as a GeoJSON object - hereinafter referred to as a floorplan object -
A floor plan object is given as a feature object (Feature) or a feature collection object (FeatureCollection) containing one or more polygons or connected line segments,
Characterized in that the queryable properties of the floor plan object include a building ID,
A digital map system including a computer program stored in a medium that integrally displays an outdoor map and an indoor map on a user terminal.
According to claim 7,
Queryable properties of a floor plan object include stroke color, stroke width, line type (strokeLineDash), and fill color.
Characterized in that the computer program includes the step of querying the properties of the floor plan object and rendering the floor plan with the properties,
A digital map system including a computer program stored in a medium that integrally displays an outdoor map and an indoor map on a user terminal.
According to claim 7,
The digital map system executes a series of stages to display the outdoor map and the indoor map integrally,
The series of steps are;
Starting the digital map with initial map settings and showing the outdoor map in the view of the digital map;
Updating the outdoor map displayed in the view according to the zoom, pan, and rotate actions by the user;
If the zoom level of the digital map is greater than or equal to the preset threshold zoom value (hereafter referred to as the database search zoom level), the building database is searched and the geographic location is set to the view extent (view extent). ) Creating a list of buildings included in - hereinafter referred to as a view extent building list -;
If the number of buildings in the view range building list is greater than 0, the representative outline drawings of the buildings whose zoom level of the digital map is greater than the zoom level for showing building outline are imported from the building data storage and displayed outdoors. Steps to mark the correct location on the map,
Among the buildings on which the representative outline drawing is displayed, the zoom level of the digital map is greater than the zoom level for showing floorplan of the building and the list of buildings with a ground floor - hereinafter, a list of buildings subject to display of a floor plan (floorplan to show building list) ) - the step of writing,
Remove the representative outline drawing of the building in the list of buildings to be displayed on the floor plan, and import the building outline drawing of the ground floor and the floor plan of the ground floor that corresponds to the zoom level of the digital map from the building data storage and display them in the correct location on the outdoor map. step,
When the zoom level of the digital map is changed due to a zooming action by the user, comparing the zoom level of the digital map with the zoom level section of the floor plan;
If the zoom level of the digital map and the zoom level of the ground floor plan do not match, the ground floor plan is removed, and the ground floor plan that matches the zoom level of the digital map is imported from the building data storage and added to the building outline of the ground floor. Characterized in that it includes the step of displaying accordingly,
A digital map system including a computer program stored in a medium that integrally displays an outdoor map and an indoor map on a user terminal.
According to claim 12,
The series of steps further includes executing a floor selection subroutine,
The layer selection subroutine;
Checking whether there is a building where the center of the view is located within the representative outline of the building or the outline of each floor - hereinafter referred to as a central building;
If there is a central building, check whether it has a basement or a multi-story building;
If the central building has a basement or a multi-story building, displaying a menu for selecting a floor;
If the user selects a floor different from the current floor, removing the outline drawing of the currently displayed central building;
If the floor plan of the current floor of the central building is displayed in the view, removing it;
Retrieving the building outline drawing of the selected floor of the central building from the data store and displaying it at the correct location on the outdoor map;
Characterized in that, among the floor plans of the selected floor of the central building, a floor plan corresponding to the zoom level of the digital map is retrieved from the data store and displayed in accordance with the building outline drawing of the selected floor.
A digital map system including a computer program stored in a medium that integrally displays an outdoor map and an indoor map on a user terminal.

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