CN104075729B - Method, device and terminal device for displaying electronic map - Google Patents
Method, device and terminal device for displaying electronic map Download PDFInfo
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- CN104075729B CN104075729B CN201310109520.1A CN201310109520A CN104075729B CN 104075729 B CN104075729 B CN 104075729B CN 201310109520 A CN201310109520 A CN 201310109520A CN 104075729 B CN104075729 B CN 104075729B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
- G01C21/26—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00 specially adapted for navigation in a road network
- G01C21/34—Route searching; Route guidance
- G01C21/36—Input/output arrangements for on-board computers
- G01C21/3626—Details of the output of route guidance instructions
- G01C21/3658—Lane guidance
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
- G01C21/26—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00 specially adapted for navigation in a road network
- G01C21/34—Route searching; Route guidance
- G01C21/36—Input/output arrangements for on-board computers
- G01C21/3626—Details of the output of route guidance instructions
- G01C21/3629—Guidance using speech or audio output, e.g. text-to-speech
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
- G01C21/26—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00 specially adapted for navigation in a road network
- G01C21/34—Route searching; Route guidance
- G01C21/36—Input/output arrangements for on-board computers
- G01C21/3667—Display of a road map
- G01C21/367—Details, e.g. road map scale, orientation, zooming, illumination, level of detail, scrolling of road map or positioning of current position marker
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- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Automation & Control Theory (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Audiology, Speech & Language Pathology (AREA)
- General Health & Medical Sciences (AREA)
- Multimedia (AREA)
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Abstract
The invention discloses a method, a device and a terminal device for displaying an electronic map. The method comprises the following steps: calculating the distance from the current position of a navigated target to a nearest to-be-amplified crossing on a front navigation route of the navigated target; judging whether the distance is smaller than a preset distance threshold value; acquiring lane information of the to-be-amplified crossing if the distance is smaller than the preset distance threshold value, and determining a target proportional scale according to the lane information; and amplifying the electronic map from an initial proportional scale to the target proportional scale, and displaying the electronic map. Through the technical scheme, when the terminal drives to the to-be-amplified crossing during navigation, the amplification of the to-be-amplified crossing can be realized without downloading a great quantity of amplification pictures of the to-be-amplified crossing, so that traffic to be consumed in the amplification process can be reduced, and the internal memory of the terminal can be saved.
Description
Technical field
The present invention relates to automobile navigation field, method, device and terminal that more particularly to a kind of electronic chart shows set
Standby.
Background technology
At present, GPS system has been widely used in automobile navigation.In vehicle mounted guidance, user's use is provided with GPS and leads
The terminal of boat system is navigated.During navigation, departure place that system selects according to user, destination, via ground, avoid ground, press
Calculate a bar navigation path according to corresponding navigation path planning principle.In vehicle travel process afterwards, system passes through car
In terminal on, gps receiver receives gps signal, determines current vehicle position, moving direction, speed etc., in conjunction with it
Before the guidance path that calculates, display to the user that navigation map.
During the traveling of vehicle, mostly all include turning, fork crossing in paths traversed, come in and go out at a high speed
The non-close such as mouth, auxiliary road gateway or the complex crossing of non-straight trip.Due to the travel direction at complex crossing in guidance path
Can change and not be to maintain straight trip, so user needs the navigation according to navigator when at complex crossing
Map determines travel direction.
When vehicle drives to complex crossing, for guaranteeing that user can see guidance path clearly, need putting complex crossing
Big figure is shown to user.In prior art, when user travels to crossing to be amplified, terminal downloads this road to be amplified from server
The enlarged drawing of mouth, then the enlarged drawing displaying to the user that this crossing to be amplified.Although this mode can be become apparent from using enlarged drawing
Display to the user that travel direction at crossing to be amplified for the guidance path, but, due to user terminal need from server
The enlarged drawing at each crossing to be amplified in middle download navigation path, so, user needs to expend quite a lot of in navigation procedure
Flow, and be also required in occupied terminal considerable internal memory to store the enlarged drawing at these crossings to be amplified.
Content of the invention
The technical problem to be solved is to provide method, device and the terminal unit that a kind of electronic chart shows,
Solving according to the more customer flow of consuming causing due to downloading the enlarged drawing at each crossing to be amplified in prior art and
Take the technical problem of more tag memory.
For solving above-mentioned technical problem, the invention provides a kind of method that electronic chart shows, the method includes：
Calculate and be navigated object current location to being navigated between nearest crossing to be amplified on guidance path in front of object
Distance；
Judge described distance whether less than preset distance threshold；
If so, then obtain the lane information at described crossing to be amplified, and target proportion chi is determined according to described lane information；
Electronic chart is amplified to described target proportion chi from initial proportion chi and shows.
Preferably, described lane information is the quantity in the section that crossing to be amplified connects, and is determined according to described lane information
Target proportion chi, including：
From the corresponding relation with scale for the preset section quantity, search the number in the section being connected with crossing to be amplified
Measure corresponding scale；In described corresponding relation, section quantity is bigger, then corresponding scale is bigger；
The scale finding is defined as described target proportion chi.
Preferably, by electronic chart after initial proportion chi is amplified to described target proportion chi, also include：Broadcast to user
Report route guidance information, and/or, guide mark in described electronic map interface drawing path.
Preferably, by electronic chart after initial proportion chi is amplified to described target proportion chi, also include：
Be navigated described in judgement whether object sails out of described crossing to be amplified, if so, then by described electronic chart from described
Target proportion chi is contracted to described initial proportion chi and shows.
Accordingly, the embodiment of the present invention also provides a kind of electronic map display equipment, and this device includes：
Distance calculation module, is navigated object current location for calculating nearest to being navigated on guidance path in front of object
The distance between crossing to be amplified；
Whether Distance Judgment module, for judging described distance less than preset distance threshold；
Lane information acquisition module, for when described Distance Judgment module is judged as YES, obtaining described crossing to be amplified
Lane information；
Target proportion chi determining module, for determining target proportion chi according to described lane information；
Map amplifies display module, for electronic chart being amplified to described target proportion chi from initial proportion chi and showing
Show.
Preferably, described lane information is the quantity in the section that crossing to be amplified connects, and described target proportion chi determines mould
Block specifically for：
From the corresponding relation with scale for the preset section quantity, search the number in the section being connected with crossing to be amplified
Measure corresponding scale；In described corresponding relation, section quantity is bigger, then corresponding scale is bigger；
The scale finding is defined as described target proportion chi.
Preferably, also include：
Voice broadcast module, for reporting route guidance information to user；
And/or,
Route guiding identifies drafting module, for guiding mark in described electronic map interface drawing path.
Preferably, also include：
Sail out of judge module, for being navigated whether object sails out of described crossing to be amplified described in judging, if then starting
Described map display module；
Map reduces display module, and described electronic chart is contracted to described initial proportion chi simultaneously from described target proportion chi
Display.
Accordingly, the embodiment of the present invention additionally provides a kind of terminal unit, including the electronic chart of aforementioned any embodiment
Display device.
Compared with prior art, the present invention has advantages below：
Technical scheme, when be navigated object current location be navigated nearest on guidance path in front of object
When the distance between crossing to be amplified is less than preset distance threshold, obtain the lane information at this crossing to be amplified and according to this car
Road information determines target proportion chi, then electronic chart is amplified to target proportion chi shows.Because the present invention uses basis
The lane information at crossing the electronic chart being saved in terminal is carried out the amplification of appropriate scale, so, not only can make
User more clearly checks travel direction at crossing to be amplified for the guidance path by the electronic chart of magni-scale, and
Terminal is not in the case of needing to download the enlarged drawing at each crossing to be amplified from server it is possible to realize waiting to put to user
The electronic chart that at big crossing, displaying ratio chi amplifies, such that it is able to avoid downloading the amplification at crossing to be amplified in a large number from server
Figure, thus decrease user during amplification display and needing the flow consuming and save the internal memory of terminal.
Brief description
In order to be illustrated more clearly that the embodiment of the present application or technical scheme of the prior art, below will be to embodiment or existing
Have technology description in required use accompanying drawing be briefly described it should be apparent that, drawings in the following description be only this
Some embodiments described in application, for those of ordinary skill in the art, on the premise of not paying creative work,
Other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the flow chart of the embodiment of the method 1 that electronic chart shows in the present invention；
Fig. 2 is the flow chart of the embodiment of the method 2 that electronic chart shows in the present invention；
Fig. 3 is the flow chart of the embodiment of the method 3 that electronic chart shows in the present invention；
Fig. 4 is the flow chart of the device embodiment 1 that electronic chart shows in the present invention；
Fig. 5 is the flow chart of the device embodiment 2 that electronic chart shows in the present invention；
Fig. 6 is the structure chart of the device embodiment 3 that electronic chart shows in the present invention；
Fig. 7 is the structure chart of the device embodiment 4 that electronic chart shows in the present invention；
Fig. 8 is the structure chart of the device embodiment 5 that electronic chart shows in the present invention.
Specific embodiment
In order that those skilled in the art more fully understand application scheme, below in conjunction with the embodiment of the present application
Accompanying drawing, is clearly and completely described to the technical scheme in the embodiment of the present application it is clear that described embodiment is only this
Apply for a part of embodiment, rather than whole embodiments.Based on the embodiment in the application, those of ordinary skill in the art exist
The every other embodiment being obtained under the premise of not making creative work, broadly falls into the scope of the application protection.
Inventor finds through long-term research, and prior art amplifies display navigation picture in navigation at crossing to be amplified
As when can consume more customer flow and take more tag memory the reason be, in guidance path pass through each wait to put
Big junction terminal is required for downloading its enlarged drawing from server.But, the map content that in enlarged drawing, reality is comprised is at end
Exist in the electronic chart at end, so, electronic chart amplification actually only need to be can be obtained by be amplified by terminal
The enlarged drawing at crossing, downloads enlarged drawing without from server.
Based on the discovery in the studies above, main idea is that：Monitoring terminal near crossing to be amplified
When, obtain the lane information at this crossing to be amplified, and determine amplification target proportion chi to be reached according to lane information,
According still further to target proportion chi, electronic chart is amplified display.Because terminal is amplifying display through crossing to be amplified to user every time
During navigation picture, use and the electronic chart in terminal is carried out with what the amplification of appropriate scale to be realized, so
Terminal need not download the enlarged drawing at crossing to be amplified from server, and so, terminal is just not necessarily and downloads each crossing to be amplified
Enlarged drawing and consumed flow, are also not necessarily and deposit the enlarged drawing of download and consume internal memory.
Below in conjunction with the accompanying drawings, method, the end at crossing are shown in the guidance path describing the present invention by embodiment in detail
The implementation of end, navigation engine and system.
Referring to Fig. 1, the flow chart showing the embodiment of the method 1 that in the present invention, electronic chart shows.The present embodiment is permissible
It is applied to the terminal with navigation feature.This terminal may be mounted at various vehicles etc. and is navigated on object.This terminal can be
The electronic equipments such as personal digital assistant, mobile terminal, MP3, MP4, electronics wrist equipment and all kinds of miniature electronic instrument.
The present embodiment may comprise steps of：
S101, calculate and be navigated object current location to being navigated nearest crossing to be amplified on guidance path in front of object
The distance between.
Wherein, crossing to be amplified can be realized by way of pre-setting.After having planned guidance path, permissible
Know which crossing is comprised on this guidance path, and crossing is determined the need of amplification according to the characteristic at crossing, and to needs
The crossing amplified records magnifying tags, so as follow-up in navigation procedure, can know that to be navigated object current in real time
Whether position is the crossing needing to amplify to being navigated nearest crossing on guidance path in front of object（I.e. crossing to be amplified）.In advance
During setting, crossing to be amplified can be crossing or the link road hop count that link road segment number is more than preset quantity threshold value
But amount has turning, bifurcated road, high speed gateway or the crossing teaching gateway less than preset quantity threshold value, can also be
It is navigated object and travel to this crossing the crossing that travel direction change can occur.In setting, crossing to be amplified can only include
A certain kind in above-mentioned three kinds of crossings or certain two kinds are it is also possible to above-mentioned three kinds of crossings are included.
It should be noted that in navigation procedure, terminal can obtain the location information being navigated object in real time, so that it is determined that
It is navigated the current location of object.For example, terminal can pass through its GPS（Global positioning system）The location information of feedback is determining
It is navigated the current location of object.In addition, being navigated the current location of object it is also desirable to further determine that current with this determining
The corresponding crossing to be amplified in position.Travel on guidance path always due to being navigated object, the crossing to be amplified meeting in front of it
Change, so after in real time obtaining current location, determine also that and nearest on guidance path in front of this current location wait to put
Big crossing.And for step S101, then can be that real-time execution carrys out computed range it is also possible to set a time or distance,
Every through this time or apart from when, ability execution step S101 carrys out computed range.
It is understood that the distance in the present embodiment may refer to straight line between current location and crossing to be amplified away from
From it is also possible to refer on guidance path between the two with a distance from line.
S102, judge described distance whether less than preset distance threshold；If it is, entering step S103.
S103, the lane information at the described crossing to be amplified of acquisition, and target proportion chi is determined according to described lane information.
Wherein, lane information represents the track road conditions at crossing to be amplified.Specifically, can for road junction roadway information to be amplified
To be an information, its content is the section quantity being connected with crossing to be amplified；Or, for the track at crossing to be amplified
Information can be at least one information, and wherein one lane information represents the section that this crossing is connected.For example, four crossway
Mouth is formed by connecting by 4 sections, then lane information can be information or a difference representing that section quantity is 4
Represent 4 lane informations in four sections；And for example, the junction of three roads is formed by connecting by 3 sections, then lane information can be one
Bar represents the information or 3 lane informations representing three sections respectively that section quantity is 3.
Because lane information can be the information representing different content, so being directed to lane information different content, target ratio
The determination of example chi also has various ways.
The information being the section quantity that an expression is connected with crossing corresponding to lane information, the determination of target proportion chi
Mode can specifically include：From the corresponding relation between preset section quantity and scale, search and described crossing to be amplified
The corresponding scale of section quantity being connected；The scale finding is defined as described target proportion chi.Wherein, described
In corresponding relation, section quantity is bigger, then corresponding scale is bigger.For example, when section quantity≤2, corresponding target ratio
Example chi can be the original scale of electronic chart（1：100）；When 2 ＜ section quantity≤5, corresponding scale can be 1：
50；When 5 ＜ section quantity≤8, corresponding target proportion chi can be 1：25.In addition, described corresponding relation can be pre-
Put a code table in the terminal, corresponding lane information bar number and target proportion described in each Data Entry in this code table
Chi.
Represent a crossing being connected with current crossing, then the determination side of target proportion chi corresponding to a lane information
Formula can be the quantity of the lane information that terminal first calculates crossing to be amplified, then according to preset lane information quantity and ratio
Corresponding relation between chi, searches the corresponding scale of lane information quantity as target proportion chi.
Certainly, it is not necessary to determine target proportion using searching in default corresponding relation in above-mentioned determination mode
Chi.For example, a kind of alternative determination mode can be for building between section quantity or lane information quantity and target proportion chi
A vertical functional relationship, when each enlarged map base map, using section quantity or the lane information number at crossing to be amplified
Amount goes to calculate the target proportion chi of required amplification.
S104, electronic chart is amplified to described target proportion chi from initial proportion chi and shows.
Wherein, initial proportion chi is generally the default scale chi of electronic chart, such as 200 meters.In addition, amplifying in electronic chart
During display, can call and electronic chart is drawn with lower interface：mapView.getController().setZoom
(targetZoom).
It should be noted that the drafting of electronic chart can be divided into vector drawing and grid to draw, the image being formed divides
Wei not vectogram and grid map.Wherein, vectogram have be easy to OO data represent, data structure compact, redundancy
Low, be conducive to that analysis of network, figure shows quality be good, high precision the advantages of.And grid map then exists, and graph data amount is big, projection
Change relatively difficult, the more low problem of graphical quality, so, in the present embodiment, it is preferred to use the mode of vector drawing obtains
To vectogram.
After the execution of step S104 completes, the present embodiment can terminate flow process.
Notice that navigation picture is exaggerated and informs that in front of user, direction of traffic can change for the ease of user, eventually
Route guidance information can also be reported to user after step s 104 in end.
In addition, in order that user readily apparent understands the travel direction at current crossing, terminal can also be in step
After S104, guide mark in described electronic map interface drawing path, specifically, can navigate according in described electronic chart
The travel direction in path is drawn navigation arrow and is displayed to the user that described navigation arrow.User checks for convenience,
This arrow may be displayed on the fixed position of terminal display screen, such as the upper left corner.In addition, its display location can also according to
The actual demand at family changes.
It should be noted that in the present embodiment, step S101 and S102 can come by the navigation engine in terminal
Become.Now, the location information that GPS feeds back can be sent to navigation engine by terminal, and navigation engine judged result in S102 is
In the case of being, map amplification instruction message can be assigned to the map drawing module of terminal, and embed track within the message
Information, so to complete subsequent step by map drawing module again.It is understood that navigation engine sends map amplification instruction
Message can adopt multiple different trigger conditions.For example, navigation engine can be in the current location monitoring terminal every time
Send when changing, navigation engine can also be sent when changing at crossing to be amplified.And in order that user can be
Check during straight trip that the entirety trend of guidance path only checks clearer enlarged drawing in complex crossing to be amplified, the present embodiment
In preferably employed navigation engine send map amplification instruction trigger condition be when terminal is near current complex crossing send.
By the technical scheme of the present embodiment, because terminal is displaying to the user that amplification through complicated crossing to be amplified every time
During figure amplifies display navigation picture, use the electronic chart in terminal is carried out appropriate scale amplification come real
Existing, only need to obtain the message comprising lane information, so terminal need not be downloaded from server waiting to put from navigation engine
The enlarged drawing of big complex crossing, and obtained enlarged drawing is actually the map base map that terminal was originally just preserved, so,
Terminal is just not necessarily downloads the enlarged drawing of each complex crossing to be amplified and consumed flow, is also not necessarily the enlarged drawing depositing download
Consume internal memory.
At complex crossing to be amplified, electronic chart is amplified can make user more clearly check that guidance path is being treated
Amplify the direction of traffic at crossing.But when user sails out of crossing to be amplified, check overall navigation road for the ease of user
Electronic chart can also be contracted to original scale by footpath.
Referring to Fig. 2, the flow chart showing the embodiment of the method 2 that in the present invention, electronic chart shows.The present embodiment be
On the basis of preceding method embodiment 1, reduce display electronic chart.The present embodiment applies equally to terminal, can be in aforementioned side
After step S104 of method embodiment 1, further comprising the steps of：
It is navigated whether object sails out of described crossing to be amplified described in S201, judgement, if so, then enter step S202.
After electronic chart is displayed magnified, terminal may proceed to the current location that real-time monitoring is navigated object, and root
To judge to be navigated whether object sails out of crossing to be amplified according to the position relationship of current location and crossing to be amplified.
It should be noted that judging to be navigated whether object sails out of the mode at crossing to be amplified using multiple different sides
Formula.For example, judge whether its current location is identical with crossing to be amplified, for another example, judge that its current location is in guidance path
The no front having been located in crossing to be amplified, and for example, has been located in front of crossing to be amplified in guidance path in its current location
In the case of, navigation engine judges whether the distance between its current location and crossing to be amplified exceed default distance threshold.
S202, described electronic chart is contracted to described initial proportion chi from described target proportion chi shows.
Reduce during electronic chart it is also possible to call the interface adopting in abovementioned steps S104 to be drawn, can during drafting
Preferably to draw vectogram.
It should be noted that in the present embodiment, except step S101 and S102, step S201 can also be leading by terminal
Boat engine, to complete, in the case of being to be in the judged result of step S201, can assign ground to the map drawing module of terminal
Figure reduction instruction message, so that the electronic chart that its drafting is reduced.Wherein, after step S104 completes, terminal is electronically
Figure is the state being constantly in amplification, and map drawing module is simply receiving the map reduction instruction of navigation engine transmission
During message, just map base map can be reduced.Specifically, navigation engine sends map amplification instruction message in step s 102
Afterwards, may proceed to real-time monitoring current location thus continue as user navigation, simultaneously also continue waiting for map reduction instruction disappear
Breath.
In the present embodiment, navigation engine send map reduce instruction message trigger condition can also have multiple.For example,
Navigation engine can be to be navigated transmission when object sails out of crossing to be amplified, and navigation engine can also be to send map amplification
After instruction message through the regular hour or apart from when send.In order that user can check before crossing to be amplified
To the enlarged drawing at crossing to be amplified, trigger condition that in the present embodiment, preferably reduction instruction sends is to sail out of being navigated object
Send during crossing to be amplified.
In addition, treating in step S101, after have sent map reduction instruction message, can directly be put by navigation engine
Big crossing is changed into the next one crossing to be amplified in front of guidance path.
By the technical scheme of the present embodiment, terminal can display for a user the electronics reducing when sailing out of crossing to be amplified
Map, so that user can easily check the overall row of guidance path during the straight trip after crossing to be amplified
Car direction.
In order that those skilled in the art are more clearly understood that technical scheme, aforesaid method will be corresponded to below
Embodiment, in conjunction with specific scene, is illustrated with the angle of intermodule interaction in equipment.In this application scenarios, in terminal
Including modules such as navigation engine, map drawing module.
Referring to Fig. 3, the flow chart showing the embodiment of the method 3 that in the present invention, electronic chart shows.The present embodiment is permissible
It is applied to including the terminal unit with navigation feature.The present embodiment may comprise steps of：
The current location of S301, terminal GPS real-time navigation engine feedback terminal.
S302, navigation engine calculate current location and currently the distance between crossing to be amplified：Currently crossing to be amplified is
It is navigated nearest crossing to be amplified on guidance path in front of object.
S303, navigation engine judge whether described distance is less than distance threshold；If it is, entering step S304, if
No, then return to step S301.
S304, navigation engine send map amplification instruction message to map drawing module.
S305, map drawing module extract the lane information at currently crossing to be amplified from map amplification instruction message.
Corresponding for lane information Road segment number scale is defined as target proportion chi by S306, map drawing module：First
Quantity corresponding scale in section is searched according to corresponding relation, then the scale finding is defined as target proportion chi.
Electronic chart is amplified display by S307, map drawing module：Electronic chart is amplified to target ratio from initial proportion chi
Example chi；Execution enters step S308 and step S309 after completing.
S308, terminal to user report route guidance information and on electronic chart drawing path guiding mark.
S309, navigation engine judge to be navigated whether object sails out of crossing to be amplified；If it is, entering step S310,
If it is not, then repeating S309.
S310, navigation engine send map reduction instruction message to map drawing module.
Electronic chart is reduced display by S311, map drawing module：It is contracted to initial proportion chi；The execution of step S312 completes
After, return to step S301.
By the embodiment of the method 3 of above-mentioned scene, user not only can be made more clearly to look into when near crossing to be amplified
Treat the overall direction of traffic amplifying the direction of traffic at crossing and guidance path being checked when sailing out of crossing, and, terminal
Enlarged drawing and consumed flow may not necessarily be downloaded for it, also be not necessarily and deposit the enlarged drawing of download and consume internal memory, thus saving
The flow of user and the internal memory of terminal.
Corresponding to embodiment of the method, present invention also offers the device that a kind of electronic chart shows.
Referring to Fig. 4, show the structure chart of the device embodiment 1 that in the present invention, electronic chart shows.In the present embodiment, institute
State device can include：
Distance calculation module 401, is navigated object current location to being navigated guidance path in front of object for calculating
The distance between nearest crossing to be amplified；
Whether Distance Judgment module 402, for judging described distance less than preset distance threshold；
Lane information acquisition module 403, for when described Distance Judgment module 402 is judged as YES, waiting to put described in acquisition
The lane information at the big current crossing in crossing；
Target proportion chi determining module 404, for determining target proportion chi according to described lane information；
Map amplifies display module 405, for electronic chart is amplified to described target proportion chi simultaneously from initial proportion chi
Display.
Wherein, it is preferred that lane information is the quantity in the section that crossing to be amplified connects in the present embodiment, then now right
The target proportion determining module 404 answered can be specifically for：
From the corresponding relation with scale for the preset section quantity, search the number in the section being connected with crossing to be amplified
Measure corresponding scale；In described corresponding relation, section quantity is bigger, then corresponding scale is bigger；
The scale finding is defined as described target proportion chi.
Referring to Fig. 5, show the structure chart of the device embodiment 2 that electronic chart of the present invention shows.In the present embodiment, except
Outside all structures described in aforementioned means embodiment 1, described device can also include：
Sail out of judge module 501, for being navigated whether object sails out of described crossing to be amplified described in judging, if then opening
Move described map and reduce display module 502；
Map reduces display module 502, and described electronic chart is contracted to described initial proportion from described target proportion chi
Chi simultaneously shows.
Referring to Fig. 6, show the structure chart of the device embodiment 3 that electronic chart of the present invention shows.In the present embodiment, except
Outside all structures described in aforementioned means embodiment 1, described device can also include：
Voice broadcast module 601, for reporting route guidance information to user.
Referring to Fig. 7, show the structure chart of the device embodiment 4 that electronic chart of the present invention shows.In the present embodiment, except
Outside all structures described in aforementioned means embodiment 1, described device can also include：
Route guiding identifies drafting module 701, for guiding mark in described electronic map interface drawing path.
Referring to Fig. 8, show the structure chart of the device embodiment 5 that electronic chart of the present invention shows.This device has gone out device
Outside all structures described in embodiment 1, also include aforementioned voice broadcasting module 601 and Route guiding mark drafting module 701.
Corresponding to embodiment of the method, present invention also offers a kind of terminal unit.This terminal unit includes aforementioned arbitrary dress
Put the device described in embodiment.
By assembly of the invention and apparatus embodiments, not only can make user near crossing to be amplified when more clearly
Check the direction of traffic at crossing to be amplified and the overall direction of traffic of guidance path can be checked when sailing out of crossing, and, eventually
Enlarged drawing and consumed flow may not necessarily be downloaded for it in end, be also not necessarily and deposit the enlarged drawing of download and consume internal memory, thus saving
The internal memory of the flow of user and terminal.
It should be noted that herein, such as first and second or the like relational terms are used merely to a reality
Body or operation are made a distinction with another entity or operation, and not necessarily require or imply these entities or deposit between operating
In any this actual relation or order.Term " inclusion ", "comprising" or its any other variant are intended to non-row
The comprising of his property, so that including a series of process of key elements, method, article or equipment not only include those key elements, and
And also include other key elements of being not expressly set out, or also include intrinsic for this process, method, article or equipment institute
Key element.In the absence of more restrictions, the key element being limited by sentence "including a ..." is it is not excluded that including institute
Also there is other identical element in process, method, article or the equipment of stating key element.
For system embodiment, because it corresponds essentially to embodiment of the method, thus real referring to method in place of correlation
The part applying example illustrates.System embodiment described above is only schematically, wherein said as separating component
The unit illustrating can be or may not be physically separate, as the part that unit shows can be or can also
It is not physical location, you can with positioned at a place, or can also be distributed on multiple NEs.Can be according to actual
Need to select the purpose to realize this embodiment scheme for some or all of module therein.Those of ordinary skill in the art are not
In the case of paying creative work, you can to understand and to implement.
The above is only the specific embodiment of the application it is noted that ordinary skill people for the art
For member, on the premise of without departing from the application principle, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as the protection domain of the application.
Claims (9)
1. a kind of method that electronic chart shows is it is characterised in that methods described includes：
Calculate be navigated object current location to be navigated between nearest crossing to be amplified on guidance path in front of object away from
From；
Judge described distance whether less than preset distance threshold；
If so, then obtain the lane information at described crossing to be amplified, and target proportion chi is determined according to described lane information；
Electronic chart is amplified to described target proportion chi from initial proportion chi and shows.
2. method according to claim 1 is it is characterised in that described lane information is the number in the section that crossing to be amplified connects
Amount, determines target proportion chi according to described lane information, including：
From the corresponding relation with scale for the preset section quantity, search the quantity pair in the section being connected with crossing to be amplified
The scale answered；In described corresponding relation, section quantity is bigger, then corresponding scale is bigger；
The scale finding is defined as described target proportion chi.
3. method according to claim 1 and 2 it is characterised in that be amplified to described by electronic chart from initial proportion chi
After target proportion chi, also include：Report route guidance information to user, and/or, in described electronic map interface drawing path
Guiding mark.
4. method according to claim 1 and 2 it is characterised in that be amplified to described by electronic chart from initial proportion chi
After target proportion chi, also include：
Be navigated described in judgement whether object sails out of described crossing to be amplified, if so, then by described electronic chart from described target
Scale compression to described initial proportion chi and shows.
5. a kind of electronic map display equipment is it is characterised in that include：
Distance calculation module, is navigated object current location to being navigated nearest treating on guidance path in front of object for calculating
Amplify the distance between crossing；
Whether Distance Judgment module, for judging described distance less than preset distance threshold；
Lane information acquisition module, for when described Distance Judgment module is judged as YES, obtaining the car at described crossing to be amplified
Road information；
Target proportion chi determining module, for determining target proportion chi according to described lane information；
Map amplifies display module, for electronic chart being amplified to described target proportion chi from initial proportion chi and showing.
6. device according to claim 5 is it is characterised in that described lane information is the section that crossing to be amplified connects
Quantity, described target proportion chi determining module specifically for：
From the corresponding relation with scale for the preset section quantity, search the quantity pair in the section being connected with crossing to be amplified
The scale answered；In described corresponding relation, section quantity is bigger, then corresponding scale is bigger；
The scale finding is defined as described target proportion chi.
7. the device according to claim 5 or 6 is it is characterised in that also include：
Voice broadcast module, for reporting route guidance information to user；
And/or,
Route guiding identifies drafting module, for guiding mark in described electronic map interface drawing path.
8. the device according to claim 5 or 6 is it is characterised in that also include：
Sail out of judge module, for being navigated whether object sails out of described crossing to be amplified described in judging, if then starting described
Map display module；
Map reduces display module, described electronic chart is contracted to described initial proportion chi from described target proportion chi and shows
Show.
9. a kind of terminal unit is it is characterised in that include the device described in aforementioned any one of claim 5～8.
Priority Applications (1)
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| CN201310109520.1A CN104075729B (en) | 2013-03-29 | 2013-03-29 | Method, device and terminal device for displaying electronic map |
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| CN201310109520.1A CN104075729B (en) | 2013-03-29 | 2013-03-29 | Method, device and terminal device for displaying electronic map |
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| CN104075729A CN104075729A (en) | 2014-10-01 |
| CN104075729B true CN104075729B (en) | 2017-02-08 |
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