JP4750508B2 - Nautical Chart Information Processing Method, Nautical Chart Information System, Nautical Chart Information Program, and Recording Medium - Google Patents

Description

  The present invention relates to a chart information processing method, chart information system, chart information program, and recording medium, and relates to, for example, an electronic chart.

  Since the present invention was developed based on known / public technologies (for example, water depth calculation technology used for voyage) without conducting prior art searches, the prior art known to the applicant is publicly known. Does not fall under the invention. Hereinafter, known and public water depth calculation techniques will be described.

  Currently, in a ship that conducts voyage, an electronic chart for voyage and its own positioning data (that is, position information) are read by a computer installed in the ship, and the electronic device is displayed on a display provided in the computer. It is common to display an image in which the nautical chart and the positioning data are overlaid to grasp the position of the ship and the surrounding water depth value. The positioning data is acquired by a position information acquisition device (for example, a GPS (Global Position (Positioning) System) device).

  The water depth value on the chart displayed on the display is the value of the water depth from the lowest water surface (that is, the water depth not considering tides), so the actual water depth value at the current time (ie, from the sea surface to the sea floor). The distance is often different from the distance to Therefore, when estimating the actual water depth at the current time, the tide data provided by each test tide station is obtained, and the current time is compared with the estimated calculation based on the water depth indicated in the chart above. The tide height (that is, the vertical distance from the lowest water surface to the sea level) data is incorporated and estimated, and the water depth value based on the tide (hereinafter referred to as the estimated water depth value) is obtained.

  In addition, even when planning a planned route on land, the estimated tidal data for the surrounding sea area on the planned route is obtained, and the water depth value at the time when the vehicle passes the passing point in the planned route (ie, the scheduled passage time) The estimated water depth value of the entire planned route is estimated by incorporating the tide height value in the estimated data of the tide into the estimation calculation based on. And the method of examining the safety | security of the ship which passes along this route by this estimated water depth value is common. The tide estimation data as described above is time-series data composed of time and tide height.

  According to the water depth calculation technique as described above, when estimating the estimated water depth value of the current time at the current position of the ship (that is, the estimation target sea area including the current position) on the ship, the estimation target sea area. Select tide height data based on the current time from the tide height data group arranged in the time series, and make a guess by incorporating the selected tide height data into the estimation calculation based on the water depth value shown in the chart. Yes.

  However, since the estimation work involves complicated operations, for example, there was a risk that the selection error (or misreading) of the tide height data occurred, and the ship entered the dangerous sea area and caused grounding. .

  The present invention has been made based on the above-mentioned problems, and calculates the estimated water depth based on the distance from the lowest water surface to the sea bottom and the tide height, and derives a safe route or sea area, a chart information processing method, and a chart An object is to provide an information system, a nautical chart information program, and a recording medium.

In order to solve the above-mentioned problem, the present invention is characterized in that the chart information device calculates a tide height value corresponding to a specific position information and a specific time from a tide harmonic constant. A step of calculating an estimated water depth value from the water depth value corresponding to the position information and the tide height value by the nautical chart information device; and a water depth value mesh data and a tide height mesh data relating to a specific sea area by the nautical chart information device. a nautical chart information processing method and a step of visualizing the estimated depth value mesh data having the combined estimated depth value group based on, by the chart information apparatus, specific time obtained from just below the water depth value reader And the estimated depth value corresponding to the time and the position information obtained from the estimated depth value mesh data by the chart information device. And correcting the depth value mesh data.

The invention according to claim 2 is the invention according to claim 1 , wherein a plurality of direct water depth values are acquired within a specific time by the direct water depth reading device , and an average of the direct water depth value group is obtained by the chart information device. A value is calculated, and the estimated water depth mesh data is corrected by the average value .

The invention according to claim 3 is the nautical chart information processing method according to claim 1 or 2, wherein the nautical chart information device includes a hull shape information, a monitoring depth, a monitoring range including a monitoring range, and a position of the hull. A step of determining a risk relating to the hull from the relationship between the information and an estimated water depth value relating to the hull, and the chart information device indicating the estimated water depth value determined to be dangerous and the estimated water depth value And a step of issuing a warning by extracting position information and a time or time zone indicating the estimated water depth value.

The invention according to claim 4 calculates the tide height value corresponding to the specific position information and the specific time from the tide harmonic constant, and the estimated water depth from the water depth value corresponding to the position information and the tide height value. A chart information system that calculates estimated values and visualizes estimated depth data having a group of estimated depth values synthesized based on depth value mesh data and tide height value mesh data for a specific sea area, A depth value directly under the specific time and position information is acquired from the device, an estimated depth value corresponding to the time and position information is acquired from the estimated depth value mesh data, and the estimated depth value and the directly below water depth value are obtained. The estimated water depth mesh data is corrected based on the relationship .

According to a fifth aspect of the present invention, in the fourth aspect of the invention, a plurality of direct water depth values are acquired within a specific time from the direct water depth reading device, and an average value of the direct water depth value group is calculated. The estimated water depth mesh data is corrected by the average value.

The invention described in claim 6 is the invention described in claim 4 or 5 , wherein the monitoring parameters including the hull shape information, the monitoring water depth, the monitoring range, the position information of the hull, the estimated water depth value relating to the hull, The risk relating to the hull is judged from the relationship.

The invention described in claim 7 is the invention according to claim 6 , wherein the estimated water depth value determined to be dangerous, the positional information indicating the estimated water depth value, and the time or time zone indicating the estimated water depth value are extracted. It is characterized by issuing a warning.

The invention according to claim 8 is the invention according to claim 7 , wherein the estimated water depth value determined as the danger, the position information indicating the estimated water depth value, and the time or time zone indicating the estimated water depth value are as follows. It is characterized by visualizing with an identified expression.

The invention according to claim 9 is the invention according to any one of claims 6 to 8 , wherein the position information is changed, and the estimated water depth value corresponding to the changed position and the time of the position is dangerous. When it is determined, the position information, the time or time zone, and the estimated water depth value are visualized in an identified expression.

The invention described in claim 10 is the invention described in claim 9 , characterized in that the position information is changed and the time interval until visualization is set.

Invention of Claim 11 is a program, Comprising: The chart information processing method in any one of Claim 1 thru | or 3 was described with the computer program, and it was made executable.

A twelfth aspect of the invention is a recording medium, wherein the nautical chart information processing method according to any one of the first to third aspects is recorded as a program executable by a computer.

According to the first aspect of the present invention, it is possible to acquire tide height values corresponding to specific position information and specific time, and estimated water depth mesh data relating to a specific sea area. In addition, it is possible to acquire the direct water depth value related to the position information of the current time.

According to the second aspect of the present invention, the average error water depth value can be obtained.

According to the third aspect of the present invention, it is possible to acquire a monitoring parameter and extract a dangerous estimated water depth value, position information, time, or time zone.

According to the fourth aspect of the present invention, mesh data synthesized from a plurality of mesh data can be acquired , tide height values corresponding to specific position information and specific time can be calculated, and specified It is possible to acquire estimated water depth mesh data relating to the sea area, and it is possible to acquire direct water depth values relating to position information at a specific time.

According to the invention of the fifth aspect, the average value of the direct water depth value group can be obtained.

According to the sixth aspect of the present invention, the monitoring parameter can be acquired.

According to the seventh aspect of the present invention, a dangerous estimated water depth value, position information, time, or time zone can be extracted.

According to the eighth aspect of the invention, it is possible to identify a dangerous estimated water depth value, position information, time, or time zone.

According to the ninth aspect of the invention, the danger of the moved position can be identified.

According to the tenth aspect of the present invention, the speed of visualization can be changed.

According to the eleventh aspect of the present invention, it is possible to obtain a program that implements a nautical chart information processing method.

According to the twelfth aspect of the present invention, it is possible to record a program that implements the nautical chart information processing method on a recording medium.

As described above, according to the first aspect of the present invention, the estimated water depth value corresponding to specific position information and time can be acquired. Moreover, the visualized estimated water depth mesh data can be visually recognized. Furthermore, the estimated water depth mesh data corresponding to the position information of the current time can be corrected.

According to invention of Claim 2 , a new estimated water depth value can be calculated | required using an average error water depth value.

According to invention of Claim 3, the danger concerning a ship body can be judged. Also, warnings relating to dangerous estimated water depth values, position information, time or time zone can be issued.

According to the invention described in claim 4 , the synthesized mesh data can be visualized. Moreover, the estimated water depth value corresponding to specific position information and time can be acquired. Furthermore, the visualized estimated water depth value mesh data can be visually recognized. In addition, the estimated water depth mesh data corresponding to the position information at the specific time can be corrected.

According to invention of Claim 5 , a new estimated water depth value can be calculated | required using the average value of a direct water depth value group.

According to the sixth aspect of the present invention, it is possible to determine the risk associated with the hull.

According to the seventh aspect of the invention, a warning relating to a dangerous estimated water depth value, position information, time or time zone can be issued.

According to the invention described in claim 8, it is possible to visualize dangerous estimated water depth value, position information, time or time zone.

According to the invention of claim 9, the danger of the moved position can be visualized.

According to the invention described in claim 10, it is possible to grasp the moving situation in terms of time.

According to the eleventh aspect of the present invention, it is possible to execute a program that implements the nautical chart information processing method.

According to the twelfth aspect of the present invention, it is possible to obtain a recording medium on which a program that implements the nautical chart information processing method is recorded.

  As described above, these can contribute to the field of electronic charts.

  Hereinafter, a chart information processing method, chart information system, chart information program, and recording medium according to first to fifth embodiments of the present invention will be described in detail with reference to the drawings. The nautical chart information processing method, nautical chart information system, nautical chart information program, and recording medium in the present embodiment obtain new mesh data by synthesizing a three-dimensional data group (that is, mesh data) related to the sea area, and obtain the new mesh data. It is characterized by visualizing.

  For example, as shown in FIG. 9, a three-dimensional data group (hereinafter referred to as a depth value H from the lowest water surface; for example, a water depth value H in FIG. 9) relating to a specific sea area is shown. (Referred to as water depth mesh data) and a three-dimensional data group (hereinafter referred to as tide height mesh data) composed of longitude, latitude, and tide height values (for example, tide height value G in FIG. 9) ( That is, mesh data (ie, a three-dimensional data group composed of longitude, latitude, and estimated water depth values) having estimated water depth values (for example, estimated water depth value C in FIG. 9); And the estimated water depth mesh data is visualized. The object to be visualized is a range (hereinafter referred to as an estimated range) or a point (hereinafter referred to as an estimated point) narrower than the estimated depth value mesh data at least in the estimated depth value mesh data. Note that the mesh data may be referred to as grid data.

  Furthermore, the chart information processing method, chart information system, chart chart information program, and recording medium according to the present embodiment are configured so that the estimated water depth value corresponding to the position (for example, the position where the ship exists) information and time is a dangerous value (for example, It is also characterized by visualizing the position corresponding to the estimated water depth value so that a warning is issued in the case of a value corresponding to a predicted value of ship grounding.

  The first to fifth embodiments of the present invention create a chart information processing program adaptable to a predetermined computer based on the chart information processing method of the first to fifth embodiments of the present invention, and the chart information processing program Is installed in the computer from the recording medium described above and the chart information processing program is executed to form a chart information processing system.

  An example of the configuration of the first to fifth embodiments will be described with reference to FIG. The nautical chart information system in FIG. 1 includes a nautical chart information apparatus main body 1, a position information acquisition device (for example, a GPS device) 2 that can be connected to the nautical chart information apparatus main body 1, and a direct water depth reading device (for example, an acoustic sounding instrument) 3. Composed. The nautical chart information device main body 1 includes, for example, a computer, a data storage device (for example, a hard disk), a display device (for example, a display), an input device (for example, a keyboard and a mouse), a built-in clock, and the like.

  Further, the data storage device configured in the nautical chart information device main body 1 includes a water depth mesh data 4 relating to a specific sea area and mesh data of tide harmonic constants (a data group composed of longitude, latitude, and tide harmonic constants; (Hereinafter referred to as tidal harmonic constant mesh data) 5 is stored.

  In the example of the configuration of the chart information system described above, high-density mesh data acquired by the shallow water multi-beam device or the aviation laser device is adopted as the water depth value mesh data 4, and the tidal current simulation result is tidal-harmonized. It is assumed that the tide harmonic constant obtained by the analysis is adopted as the tide harmonic constant mesh data 5 (maximum tide of 60 minutes).

[First Embodiment]
The first embodiment will be described with reference to FIG. Detailed description of the same reference numerals as those in FIG. 1 is omitted. First, the nautical chart information device main body 1 reads the water depth mesh data 4 and the tidal harmonic constant mesh data 5 from, for example, the data storage device (S1, S2). The reading method is, for example, a method in which the longitude and latitude of the tidal harmonic constant mesh data 5 are read in association with (for example, matched) the longitude and latitude of the water depth mesh data 4.

  Next, the user of the system in the present embodiment inputs time and position information (estimation point for acquiring the estimated water depth value or position information included in the estimation range) to the chart information device body 1 (S3). . Note that, in the input method, for example, time and position information may be input to the nautical chart information apparatus main body 1 through an input device, or a time read from a built-in clock provided in the computer may be input. .

  Next, the tide harmonic constant mesh data 5 corresponding to the specific position is acquired, and based on the tide harmonic constant mesh data 5, a three-dimensional data group (hereinafter referred to as a tide height value) composed of longitude, latitude, and tide height values is obtained. (Referred to as mesh data) is calculated (S4). Note that, for example, a harmony method is adopted as a method for calculating a tide height value based on the tide harmonic constant mesh data 5 described above.

  The estimated depth value is obtained by combining the depth value of each longitude and latitude in the depth value mesh data 4 and the height value of each latitude and longitude in the tide height mesh data (ie, estimated depth value). Mesh data is created and visualized (S5, S6). In the above synthesis, it is preferable to calculate by matching the longitude and latitude of the tidal value mesh data with the longitude and latitude of the water depth value mesh data. Further, the synthesis of the water depth value mesh data 4 and the tide height mesh data may be regarded as a synthesis by adding the tide height value to each water depth value (S5).

  Various methods can be considered as the visualization method, and the method for drawing the estimated water depth mesh data into coordinates on the display device and drawing (or displaying in a graphic form) a chart, or chart information A method of printing a display related to the estimated water depth mesh data by connecting a printer to the apparatus main body 1 is conceivable.

  As described above, in the first embodiment, the staged chroma chart allows the user to visually grasp the estimated water depth related to a desired time and position.

[Second Embodiment]
A second embodiment of the present invention will be described with reference to FIG. 3A (a longitudinal sectional view of the ocean and a ship), FIG. 3B (a bird's eye view centering on a ship on the ocean), and FIG. Detailed descriptions of the same reference numerals as those in FIG. 1 are omitted. Moreover, in this 2nd Embodiment, the said chart information system shall be mounted in the ship.

  First, for the purpose of inputting hull shape information (for example, draft A in FIG. 3A) to the nautical chart information device main body 1 and monitoring the bottom and surroundings of the hull, a predetermined water depth (hereinafter referred to as a monitoring water depth) is obtained. For example, the monitoring water depth B in FIG. 3A) and a predetermined range (hereinafter referred to as monitoring range; for example, monitoring range F in FIG. 3B) are input from the hull (S11).

  In addition, the said monitoring water depth will be contained in the range from the bottom part J1 of the ship in FIG. The monitoring range is preferably a range wider than at least the outer periphery K1 (maximum horizontal cross section) of the hull, for example, as the monitoring range F in FIG. 3B. Furthermore, it is preferable that the monitoring range has a shape surrounding the hull, for example, a substantially circular shape or a substantially rectangular shape. The hull shape information, the monitoring water depth, and the monitoring range are collectively referred to as monitoring parameters.

  Next, the nautical chart information apparatus main body 1 acquires positioning data at the current time (that is, data indicating current ship position information) from the position information acquisition apparatus 2 connected to the nautical chart information apparatus main body 1, and The estimated water depth value is acquired based on the position information and the current time (S12). In addition, you may acquire the said estimated water depth value from the said estimated water depth value mesh data.

  Next, based on the relationship between the monitoring parameter, the positional information, and the estimated water depth value, a dangerous state related to the ship is determined (S13), and a warning is given to the user according to the determination result (S14). The dangerous state is, for example, a state in which the estimated water depth value is smaller than the sum of the draft value and the monitored water depth within the monitoring range. The estimated water depth value corresponding to the position information and the time at which the error exists corresponds to the dangerous value.

  In addition, various methods are assumed as the warning method. For example, a staged chart in which a warning sound is given to the user or a position indicating a dangerous estimated water depth value is colored in a specific color. It is preferable to display and warn. Furthermore, after issuing a warning to the user, the process may return to S12.

[Third Embodiment]
The third embodiment will be described with reference to FIG. Detailed description of the same reference numerals as those in FIG. 1 is omitted. Moreover, in this 3rd Embodiment, the said chart information system shall be mounted in the ship.

  First, the estimated water depth value corresponding to the current time and position is acquired from the estimated water depth value mesh data corresponding to the estimated range including the position (S21). Next, the direct water depth value at the current time (that is, the distance from directly below the ship to the sea floor) is obtained from the direct water depth reading device 3 (S22), and the estimated water depth value and the direct water depth value are compared (S23). ) When the estimated water depth value is smaller than the direct water depth value, the estimated water depth value is adopted as it is (S24), and visualization is performed (S26).

  On the other hand, if the estimated water depth value is equal to or greater than the direct water depth value, the estimated water depth value mesh data is corrected (hereinafter referred to as water depth correction) based on the direct water depth value (S25). The later estimated water depth mesh data is visualized (S26). There are various methods for correcting the water depth. For example, a value obtained by subtracting the water depth value directly below the estimated water depth value (hereinafter referred to as an error water depth value) is obtained, and an estimation corresponding to the entire estimation range is performed. There is a method in which a value obtained by subtracting the error water depth value from the estimated water depth value in the water depth mesh data is regarded as a new estimated water depth value.

  As shown in FIG. 6, a plurality of direct water depth values are acquired from the direct water depth reading device 3 within a specific time (for example, a short time that does not affect the calculation of the estimated water depth value) (S27). ), An average value of the direct water depth value group (hereinafter referred to as an average direct water depth value) may be calculated (S28), and the water depth correction may be performed by regarding the average direct water depth value as a direct water depth value. Moreover, you may repeat the procedure from the acquisition of the said direct water depth value to water depth correction | amendment.

[Fourth Embodiment]
The fourth embodiment will be described with reference to FIG. Detailed descriptions of the same reference numerals as those in FIGS. 1 and 3 are omitted.

  First, location information (for example, longitude and latitude of the planned location where the ship is anchored), monitoring parameters, estimated time zone (for example, time zone including the scheduled time of anchorage of the vessel; for example, 2 days) information, sample estimated time (ie , One or more sample times within the estimated time zone) are input to the nautical chart information apparatus main body 1 (S31, S32, S33). Note that the estimated sample time in the fourth embodiment is each time every n unit times (n is a natural number; the unit time is shorter than the estimated time zone) from the start time in the estimated time zone. For this reason, the number of estimated sample times is the same as the quotient obtained by dividing the time of the estimated time zone by the unit time (for example, 1 hour, 30 minutes, etc.).

  Next, the estimated water depth value is calculated based on the water depth value corresponding to the position information in the water depth value mesh data, the tidal harmonic constant corresponding to the position information in the tidal harmonic constant mesh data, and the sample estimation time. (S34, S35), visualization (S36). For example, the estimated water depth values are arranged in accordance with the time series of the sample estimated time, and are graphically displayed on the display device. In addition, when the direct water depth value is obtained in advance, a value obtained by performing water depth correction on the estimated water depth value may be visualized.

  Further, the chart information device body 1 determines the relationship between the monitoring parameter, the estimated water depth value (or a value obtained by performing water depth correction on the estimated water depth value group), and the position information, and the time when the dangerous water depth value is indicated. (Or time zone) and the estimated water depth value are extracted and warned (S36). This warning also allows the user to be taught a safe berthing time zone.

[Fifth Embodiment]
The fifth embodiment will be described with reference to FIG. Detailed descriptions of the same reference numerals as those in FIGS. 1 and 3 are omitted.

  First, monitoring parameters are input to the nautical chart information device main body 1 (S41), and the ship passes at each turning point based on the turning point, ship speed, departure time, and arrival time related to a planned route such as a ship. Time is calculated and the scheduled route is determined (S43, S44, S45, S46, S47).

  Next, after the information relating to the planned route (for example, the turning point, the passage time at the turning point, the ship speed (for example, the average ship speed)) is input to the nautical chart information device body 1, A position on the planned route is designated. Note that this designated position may be regarded as a planned passing position of the ship.

  Next, the nautical chart information apparatus main body 1 calculates a predicted passage time of the designated position (hereinafter referred to as a designated position), and acquires an estimated water depth value corresponding to the predicted passage time. The estimated water depth value may be obtained from estimated water depth value mesh data including the specified position.

  Next, a determination is made from the relationship between the estimated water depth value and the monitoring parameter, and based on the determination result, the designated position is extracted as a location indicating a dangerous estimated water depth value. In addition, when the designated position is moved over the entire planned route, it is possible to extract a portion showing a dangerous estimated water depth value as described above in the entire planned route.

  Then, after visualizing the estimated water depth mesh data, the planned route and the designated position are visualized so that the location showing the dangerous estimated water depth value can be identified (S48, S49, S50). In addition, the said identification method is the method of coloring the location which shows the dangerous estimated water depth value of the said scheduled route with a predetermined color, for example.

  In addition, the specified position (or the monitoring range including the specified position) is moved on the planned route, and the specified position is visualized so that coloring is performed in accordance with the moved position (that is, a moving image visual (S49). Furthermore, it is desirable that a processing time interval (that is, a simulation speed) from when the position is moved to when visualization is performed so that the danger associated with the estimated water depth value can be identified can be set in advance (S42).

  As described above, in the fifth embodiment, the planned route can be examined with reference to the location where the user shows the dangerous estimated water depth value.

  Although the present invention has been described in detail only for the specific examples described above, it is obvious to those skilled in the art that various changes and modifications are possible within the scope of the technical idea of the present invention. Such variations and modifications are naturally within the scope of the claims.

  For example, in the modified example of the second embodiment, the numerical value of the position information related to the ship or the position information is converted into the coordinates on the display device on the stage chart graphically displayed on the display device, An icon representing the ship can also be displayed at the converted coordinates. By this display, the user can grasp the position of the ship more visually.

  Further, in the modified example of the fifth embodiment, the most recent estimated water depth value (for example, moved) on the ship based on the current position, time, and moving speed (here, the speed including the direction) of the ship. It is also possible to obtain the estimated water depth after 1 hour of the ship.

Schematic explaining an example of the structure of the chart information system in this Embodiment. An example of the flowchart regarding the chart information system in this 1st Embodiment. Schematic explaining the monitoring parameters in the second embodiment. An example of the flowchart regarding the chart information system in the 2nd form of this Embodiment. An example of the flowchart regarding the chart information system in the third embodiment. The other example of the flowchart regarding the chart information system in this 3rd Embodiment. An example of the flowchart regarding the chart information system in the 4th form of this Embodiment. An example of the flowchart regarding the chart information system in the fifth embodiment. Schematic explaining the estimated water depth value in this Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Nautical chart information device body 2 ... Position information acquisition device 3 ... Direct water depth reading device 4 ... Water depth mesh data 5 ... Tidal harmonic constant mesh data A ... Drafting B ... Monitoring water depth C ... Estimated water depth D ... Sea surface E ... Sea bottom Surface F ... Monitoring range G ... Tide height H ... Water depth value I ... Minimum water surface J ... Ship J1 ... Bottom of ship K ... Hull K1 ... Outer circumference of hull

Claims (12)

A step in which the chart information device calculates a tide height value corresponding to a specific position information and a specific time from a tide harmonic constant;
A step of calculating an estimated water depth value from the water depth value corresponding to the position information and the tide height value by the chart information device;
Visualizing estimated depth value mesh data having estimated depth value groups synthesized based on the depth value mesh data and tide height value mesh data relating to a specific sea area, and the chart information processing method . And
With the chart information device,
Direct water depth value related to specific time and position information acquired from the direct water depth reading device;
The estimated depth value corresponding to the time and the position information acquired from the estimated depth value mesh data by the chart information device;
A nautical chart information processing method comprising correcting the estimated water depth mesh data based on the relationship . A plurality of direct water depth values are acquired within a specific time by the direct water depth reading device , an average value of the direct water depth value group is calculated by the chart information device, and the estimated water depth value mesh data is calculated based on the average value. chart information processing method according to claim 1, characterized in that to correct. A step in which the chart information device judges the risk relating to the hull from the relationship between the hull shape information, the monitoring water depth, and the monitoring parameter including the monitoring range, the hull position information, and the estimated water depth value relating to the hull; ,
The nautical chart information device extracts an estimated water depth value determined to be dangerous, position information indicating the estimated water depth value, a time or a time zone indicating the estimated water depth value, and issuing a warning;
The nautical chart information processing method according to claim 1 or 2 , characterized by comprising: Calculate the tide height corresponding to the specific position information and specific time from the tide harmonic constant,
Calculate an estimated water depth value from the water depth value corresponding to the position information and the tide height value,
A chart information system for visualizing estimated depth value mesh data having estimated depth value groups synthesized based on depth value mesh data and tidal height mesh data relating to a specific sea area,
Acquire the direct water depth value related to the specific time and position information from the direct water depth reading device,
Obtaining the estimated water depth value corresponding to the time and the position information from the estimated water depth mesh data,
A chart information system, wherein the estimated water depth mesh data is corrected based on the relationship between the estimated water depth value and the water depth value directly below . Obtaining a plurality of direct water depth values within a specific time from the direct water depth reading device, calculating an average value of the direct water depth value group, and correcting the estimated water depth mesh data by the average value; 5. A chart information system according to claim 4 , wherein Hull shape information, monitoring depth, claim that the monitoring parameters including monitoring range, the position information of the ship body, wherein the determining the estimated depth value according to the ship body, the risk of the relationship ship body 4 or 5 nautical chart information system. 7. The chart information according to claim 6 , wherein a warning is issued by extracting an estimated water depth value determined to be dangerous, position information indicating the estimated water depth value, and a time or a time zone indicating the estimated water depth value. system. Has been estimated depth value determined to be dangerous for the position information indicating the該推calculated depth value, to claim 7, characterized in that the time or time zone indicating the該推calculated depth value is visualized representation identified Nautical chart information system described. When the position information is changed and it is determined that the changed position and the estimated water depth value corresponding to the time of the position are dangerous, the position information, time or time zone, and the estimated water depth value are identified. The chart information system according to claim 6 , wherein the chart information system is visualized by expression. 10. The chart information system according to claim 9 , wherein a time interval until the visualization is performed by changing the position information is set. A program characterized in that the nautical chart information processing method according to any one of claims 1 to 3 is described as a computer program and can be executed. 4. A recording medium recorded with a program in which the nautical chart information processing method according to claim 1 is executable by a computer.

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