JP2002163266A - Map display method, system, program and storage medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To quickly use existing boring data, and to provide an inexpensive and easily usable system in software for searching the boring data on a map and displaying a cross-sectional drawing. SOLUTION: An altitude is displayed on the map by using a CD-ROM storing altitude data with every lattice point on respective divisions of a topographical map. The altitude data can be referred by readin of a header in the CD-ROM, longitude and latitude are reversed from a cursor point K on the map displayed on an image screen, and are displayed on a window 102, the lattice point of a specific division corresponding to the cursor point is seized by the relationship between the longitude and the latitude reversed from the cursor point to longitude and latitude of the left upper corner and the right lower corner in the specific division, and the altitude data on the specific lattice point read from the CD-ROM is displayed on the window 102. The boring data in the vicinity of the cursor point is displayed on the window 104, the latitude on a line connecting a starting point and an end point designated by a cursor is read from the CD-ROM, and is formed as a graph, and the boring data is displayed along the graph.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for displaying a map,
The present invention relates to a system, a program, and a storage medium, which displays a map on a screen, searches and displays boring data near a cursor point on the map, and stores a numerical map data (CD) issued by the Geospatial Information Authority of Japan. −
RОM) is used to display an elevation cross-section along a line connecting a plurality of points on the map, and to display known boring data near the elevation cross-section.

[0002]

2. Description of the Related Art As a countermeasure against earthquakes, drilling is performed for a ground survey, and data such as depth, geology, N value, etc.
Data such as longitude / latitude and altitude of a survey point is acquired. It is useful to make these data into a database so that they can be used in the future.

[0003]

Conventionally, the results of a boring survey have been delivered in the form of a document such as a "survey report" to the competent department of the local government, and the management has been performed in the form of a document. For this reason, once stored in a document as data, it is necessary to re-use the document file in an operation that is inevitable, and the inefficient and useful existing boring data may be missed. It was a factor to increase. Although there was software as a database for managing boring data, conventional software is expensive and lacks versatility due to hardware dependencies, and the user interface is sophisticated. Had not been.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has been made by using general-purpose software that can use existing boring data quickly and that operates under an operating system of a graphical interface in a personal computer. The purpose is to make the system inexpensive and easy to use.

[0005]

According to the present invention, a topographical map is divided into a number of rectangular areas having the same shape, and elevation data is stored for each of the divided rectangular areas for each grid point. A method of displaying an altitude on a map using a storage medium, wherein the altitude data in the storage medium can be referred to, a map is displayed on a screen, a cursor is displayed on the screen, and a map is displayed on the displayed map. Longitude at the cursor point
Return the latitude, grasp the specific rectangular area containing the longitude and latitude returned from the cursor point, and compare the longitude and latitude returned from the cursor point with respect to the longitude and latitude of the reference position in that specific rectangular area. A method is provided in which a specific grid point of a specific rectangular area corresponding to a cursor point is grasped from the relationship, and the altitude data of the specific grid point is read and displayed as the altitude data of the cursor point.

The operation and effect of the first aspect of the invention will be described. A numerical map issued by the Geographical Survey Institute of Japan is divided into sections similar to a 1/25000 map, and each section has two sections in the longitude and latitude directions.
It is commercially available as a set of three storage media (CD-R @ M) that include elevation value data for each of the 00 equally divided grid points. CD
The -R @ M data structure includes the longitude and latitude of the upper left and lower right corners of each section, the record number of each grid point, and the elevation value of each grid point. On the other hand, a map and a cursor are displayed on the screen, and the longitude and latitude values at the cursor point are returned. Therefore, by repeatedly determining whether or not the longitude / latitude of the cursor point is included between the longitude / latitude of the upper left and lower right corners for each section, identification in the numerical map including the longitude / latitude value at the cursor point is repeated. You can know the division. Then, based on the relationship between the longitude and latitude of the reference position (for example, the upper left corner) of the specific section thus grasped and the longitude and latitude returned from the cursor point, the cursor point corresponds to the specific grid point of the specific rectangular area. Then, it is possible to automatically grasp the order of the elevation data of the grid point and read the data from the CD-R @ M. The read elevation data is used as the elevation data of the grid point corresponding to the cursor point. Can be displayed as This altitude data display method has an effect that the altitude at the cursor point on the map can be known by combining with the map display program only by reading, without copying the CD-R @ M data itself.

According to the second aspect of the present invention, a large number of boring data including a columnar map in longitude and latitude, geological names, N values, and the like are input to a table, and a map is displayed on a screen. Display the cursor on the top, return the longitude and latitude at the cursor point on the displayed map, search for boring data related to the cursor point, and display the searched boring data on the screen Is provided.

The operation and effect of the second aspect of the present invention will be described. A lot of boring data including a column map in longitude and latitude, a geological name, an N value, etc. are input to a table and displayed at a cursor point on a displayed map. Based on the returned longitude and latitude, the search for boring data related to the cursor point is performed, and the searched boring data is displayed on the screen, so the boring data related to the cursor point is immediately displayed. Can improve search efficiency.

According to the invention described in claim 3, according to claim 2
In the method described in 1 above, the search for the boring data related to the cursor point is a search for the boring data closest to the cursor point, and the boring data such as the columnar map, the geological name, and the N value are stored in the searched cursor point. A method is provided for displaying on a screen.

[0010] The operation and effect of the invention of claim 3 will be described. The most recent boring data can be immediately displayed at the cursor point by an operation such as clicking, and a quick and efficient search can be performed. .

According to the fourth aspect of the present invention, the second aspect is provided.
In the method described in 1, the search for boring data related to the cursor point is a search for boring data located within a predetermined range with respect to the cursor point, and all the boring data located within a predetermined range with respect to the searched cursor point are displayed on the screen. A method is provided for displaying.

The operation and effect of the invention of claim 4 will be described. Even if there is a plurality of boring data located within a predetermined range with respect to the cursor point, it can be displayed collectively by an operation such as a click immediately and quickly and efficiently. A search can be performed.

According to the invention described in claim 5, according to claim 4,
2. The method according to claim 1, wherein the display of the boring data located within a predetermined range with respect to the cursor point is performed by a list.

According to the fifth aspect of the present invention, the boring data located in a predetermined range with respect to the cursor point is displayed in a list, so that even if there is a large amount of data, the surrounding geological situation can be quickly grasped. can do.

According to the invention of claim 6, according to claim 4,
2. The method according to claim 1, wherein the display of the boring data located within a predetermined range with respect to the cursor point is performed by a diagram such as a histogram.

The operation and effect of the sixth aspect of the present invention will be described. By displaying boring data located in a predetermined range with respect to the cursor point in a columnar diagram or the like, the ground condition near the cursor point can be visually and intuitively displayed. It can be grasped.

According to the present invention, a map is displayed on the screen, a cursor is displayed on the screen, and the longitude and latitude at the cursor point on the displayed map are returned. The altitude data at longitude and latitude can be read from the figure.
Specifying points, reading elevation values for longitude and latitude along a line connecting the specified points, and displaying the read elevation values as a graph on the screen with respect to the distance between the specified points. A method is provided for doing so.

The operation and effect of the invention of claim 7 will be explained. By specifying at least two cursor points and displaying the elevation change between them as a sectional view, the elevation change between the two points can be visually and intuitively intuitive. Can be used to grasp.

According to the eighth aspect of the present invention, a large number of boring data including a columnar map in longitude and latitude, a geological name, an N value, and the like are input to a table, and a map is displayed on a screen. Display a cursor at the top, return the longitude and latitude at the cursor point on the displayed map,
Elevation data at longitude and latitude can be read from the topographic map, at least two points on the map are specified with the cursor, and elevation values are read for each longitude and latitude on the line connecting the specified points, and the read elevation value Is displayed as a graph on the screen with respect to the distance between designated points, and searching for boring data at longitude and latitude along a line connecting the designated points,
A method is provided wherein the retrieved boring data is displayed on a graph.

The operation and effect of the invention according to claim 8 will be described. By specifying at least two cursor points, a change in altitude between them is displayed in a sectional view, and the longitude and latitude along a line connecting these two points are displayed. By retrieving certain boring data from the table and displaying the boring data along the altitude change line, it is possible to provide a more visual and intuitive grasp of the change state of the ground.

According to the ninth aspect of the present invention, the seventh aspect is provided.
Alternatively, in the invention described in 8, the topographic map is divided into a number of rectangular regions having the same shape in order to read the elevation data at the longitude and latitude from the topographic map, and each of the divided sections is divided into predetermined grid points. Can refer to a storage medium that stores elevation data, grasp a specific rectangular area containing the longitude and latitude returned from the cursor point as the starting point, and use the cursor for the longitude and latitude of the reference position of the specific rectangular area. The cursor point is made to correspond to the specific grid point of the specific rectangular area based on the relationship between the longitude and latitude returned from the point, the elevation data of the specific grid point is used as the elevation data of the starting point, and thereafter a straight line connecting the starting point and the ending point The altitude is read along the route up to the end of the section, and when the end of the section is reached, the altitude is read by the map section that follows this section, and this is repeated thereafter. Wherein the reading of the elevation values up to the end point is provided by.

The operation and effect of the ninth aspect of the present invention will be described. When an altitude change graph between two points on a map to which boring data is attached is drawn, a CD for elevation data of the Geographical Survey Institute of the Ministry of Construction is used. RОM data itself can be read without copying.

According to the tenth aspect of the present invention, the topographic map is divided into a plurality of rectangular areas having the same shape, and the storage medium storing elevation data for each grid point for each of the divided rectangular areas is used. A system for displaying altitude on a map, comprising means for referring to altitude data in a storage medium, means for displaying a map on a screen, means for displaying a cursor on a map, and means for displaying a cursor on a map. Means for returning the longitude / latitude at the cursor point, means for grasping a specific rectangular area including the longitude / latitude returned from the cursor point, and means for determining the reference point longitude / latitude of the specific rectangular area from the cursor point. Means for associating the cursor point with a specific grid point in a specific rectangular area based on the returned longitude / latitude, and displaying the altitude data of the specific grid point as the altitude data of the cursor point. System characterized by having a means for are provided.

The operation and effect of the invention of claim 10 are as set forth in claim 1.
It is the same as the invention of the above.

According to the eleventh aspect of the present invention, the longitude and the
A table means for inputting a large number of boring data including a columnar map at latitude, a geological name, an N value, etc .; a means for displaying a map on a screen; a means for displaying a cursor on a map; Means for returning the longitude and latitude at the cursor point on the map, means for searching for boring data relating to the cursor point from the table means, and means for displaying the searched boring data on the screen. A system is provided.

The functions and effects of the invention of claim 11 are as set forth in claim 2.
It is the same as the invention of the above.

According to the twelfth aspect of the present invention, a means for displaying a map on a screen, a means for displaying a cursor on a screen, and a method for displaying a longitude and a cursor at a cursor point on the displayed map.
Means for returning latitude, means for reading elevation data at longitude and latitude from the topographic map, means for specifying at least two points on the map with a cursor, and longitude and latitude along a line connecting the specified points A means for reading an altitude value for the object, and a means for displaying the read altitude value as a graph on a screen with respect to the distance between designated points.

The operation and effect of the twelfth aspect of the present invention is the seventh aspect.
It is the same as the invention of the above.

According to the thirteenth aspect of the present invention, the longitude
A table means capable of inputting a large number of boring data including a columnar map at latitude, a geological name, an N value, etc .; a means for displaying a map on a screen; a means for displaying a cursor on a screen; Means for returning the longitude and latitude at the cursor point on the map, means for reading elevation data at longitude and latitude from the topographic map, means for specifying at least two points on the map by the cursor, and specification Means for reading elevation values for longitude and latitude along a line connecting points, means for displaying the read elevation values as a graph on a screen with respect to the distance between designated points, and means for connecting designated points A system is provided, comprising: means for searching for boring data at longitude / latitude along a line; and means for displaying the searched boring data on a graph. That.

The operation and effect of the invention of claim 13 are as set forth in claim 8.
It is the same as the invention of the above.

According to a fourteenth aspect of the present invention, in the twelfth aspect or the thirteenth aspect, the means for reading the elevation data at the longitude and the latitude from the topographic map includes: Means for dividing into rectangular areas, making it possible to refer to a storage medium storing elevation data for each grid point for each of the divided rectangular areas, and a specific rectangle including the longitude and latitude returned from the cursor point as a starting point Means for grasping the area, and means for associating the starting point with the specific grid point of the specific rectangular area from the relationship between the longitude and latitude returned from the starting point for the longitude and latitude of the reference position of the specific rectangular area, Means for grasping the altitude data of the specific grid point as altitude data of the starting point, means for reading altitude values up to the end of the section along a straight line connecting the starting point and the ending point, and Means for reading the altitude value according to the map segment continuing to this end, and means for reading the altitude value until the end point by repeating this after that. System is provided.

The function and effect of the invention of claim 14 are as set forth in claim 9
It is the same as the invention of the above.

According to the fifteenth aspect of the present invention, the topographic map is divided into a number of rectangular areas having the same shape, and the storage medium storing elevation data for each grid point for each of the divided rectangular areas is used. A program for displaying altitude on a map, a process for enabling reference to altitude data in a storage medium, a process for displaying a map on a screen, a procedure for displaying a cursor on a map, and a procedure for displaying a cursor on the map. The process of returning the longitude and latitude at the cursor point of, the process of grasping the specific rectangular area containing the longitude and latitude returned from the cursor point, and the processing of the cursor position for the longitude and latitude of the reference position of the specific rectangular area A process of associating a cursor point with a specific grid point of a specific rectangular area based on the relationship between the returned longitude and latitude, and using the altitude data of the specific grid point as altitude data of the cursor point A program having a process of displaying.

The function and effect of the invention of claim 15 are as set forth in claim 1.
It is the same as the invention of the above.

According to the sixteenth aspect of the present invention, the longitude
A process for inputting a large number of boring data including a columnar map at latitude, a geological name, an N value, a process for displaying a map on a screen, a process for displaying a cursor on a map, and a displayed map A process for returning the longitude and latitude at the upper cursor point, a process for searching for boring data related to the cursor point, and a process for displaying the searched boring data on a screen. Program is provided.

The operation and effect of the invention of claim 16 is claim 2.
It is the same as the invention of the above.

According to the seventeenth aspect of the present invention, a process of displaying a map on a screen, a process of displaying a cursor on a screen, and a method of displaying a longitude and a position at a cursor point on the displayed map.
A process for returning latitude, a process for reading elevation data at longitude and latitude from a topographic map, a process for designating at least two points on a map with a cursor, and a longitude along a line connecting designated points A program is provided, comprising: a process of reading an altitude value with respect to latitude; and a process of displaying the read altitude value as a graph on a screen with respect to a distance between designated points on a screen.

The function and effect of the invention of claim 17 are as set forth in claim 7.
It is the same as the invention of the above.

According to the eighteenth aspect of the present invention, the longitude
A table process capable of inputting a large number of boring data including a columnar map at latitude, a geological name, an N value, etc., a process of displaying a map on the screen, a process of displaying a cursor on the screen, and Processing to return the longitude and latitude at the cursor point on the map, processing to make it possible to read elevation data at the longitude and latitude from the topographic map, processing to specify at least two points on the map with the cursor, and specification The process of reading the elevation value for each longitude and latitude on the line connecting the points, the process of displaying the read elevation value as a graph on the screen against the distance between the specified points, and the process of reading the line connecting the specified points A program is provided that has a process of searching for boring data at longitude and latitude along the line, and a process of displaying the searched boring data on a graph.

The operation and effect of the eighteenth aspect of the present invention is the eighth aspect.
It is the same as the invention of the above.

According to the nineteenth aspect of the present invention, in the invention of the seventeenth or eighteenth aspect, the processing for grasping the elevation data at the longitude and the latitude from the topographic map is performed by converting the topographic map into a plurality of the same shape. Processing to divide into rectangular areas, making it possible to refer to a storage medium storing elevation data for each grid point for each of the divided sections, and a specific rectangular area containing the longitude and latitude returned from the cursor point as the starting point And a process of associating the starting point with a specific grid point of the specific rectangular area based on the relationship between the longitude and latitude returned from the starting point for the longitude and latitude of the reference position of the specific rectangular area,
A process of reading the altitude data of the specific grid point as the altitude data of the start point, and a process of reading the altitude value until the end of the section along a straight line connecting the start point and the end point,
When it comes to the end of the section, it has a process of reading the altitude value according to the map segment continuing from this, and a process of reading the altitude value until the end point by repeating this process thereafter. A featured program is provided.

The operation and effect of the invention of claim 19 are as set forth in claim 9
It is the same as the invention of the above.

According to the twentieth aspect of the present invention, the topographical map is divided into a number of rectangular areas having the same shape, and a storage medium storing elevation data for each grid point for each of the divided rectangular areas is used. A medium storing a program for displaying an altitude on a map, a process for enabling reference to altitude data in a storage medium, a process for displaying a map on a screen, a procedure for displaying a cursor on a map, and a display Process to return the longitude and latitude at the cursor point on the specified map, processing to grasp a specific rectangular area containing the longitude and latitude returned from the cursor point, and longitude and latitude of the reference position of the specific rectangular area The process of associating a cursor point with a grid point of a specific rectangular area based on the relationship between longitude and latitude returned from the cursor point with respect to, and displaying the elevation data of the grid point corresponding to the cursor point with the cursor There is provided a storage medium storing a program for displaying an altitude on a map having a process of reading and displaying the altitude data of a point.

The operation and effect of the twentieth aspect of the present invention is the first aspect.
It is the same as the invention of the above.

According to the twenty-first aspect of the present invention, the longitude,
A table process for inputting a large number of boring data including a column diagram at latitude, a geological name, an N value, etc., a process of displaying a map on a screen, a process of displaying a cursor on a map, and A boring data search including a process for returning longitude and latitude at a cursor point on a map, a process for searching for boring data related to the cursor point, and a process for displaying the searched boring data on a screen A storage medium storing a program is provided.

The function and effect of the invention of claim 21 are as set forth in claim 2.
It is the same as the invention of the above.

According to the twenty-second aspect of the present invention, a process of displaying a map on a screen, a process of displaying a cursor on a screen, and a method of displaying a longitude and a cursor at a cursor point on the displayed map.
A process for returning latitude, a process for reading elevation data at longitude and latitude from a topographic map, a process for designating at least two points on a map with a cursor, and a longitude along a line connecting designated points A storage medium storing an altitude display program including a process of reading an altitude value with respect to latitude and a process of displaying the read altitude value as a graph on a screen with respect to a distance between designated points is provided. .

The function and effect of the invention of claim 22 are as set forth in claim 7.
It is the same as the invention of the above.

According to the twenty-third aspect of the present invention, the longitude
A table process capable of inputting a large number of boring data including a columnar map at latitude, a geological name, an N value, etc., a process of displaying a map on the screen, a process of displaying a cursor on the screen, and Processing to return the longitude and latitude at the cursor point on the map, processing to make it possible to read elevation data at the longitude and latitude from the topographic map, processing to specify at least two points on the map with the cursor, and specification Processing to grasp the elevation value for each longitude and latitude on the line connecting the points, processing to display the read elevation value as a graph on the screen with respect to the distance between the specified points, and line connecting the specified points A boring data display program having a process of searching for boring data at longitude and latitude along the line and a process of displaying the searched boring data according to the graph is stored. Storage medium is provided.

The operation and effect of the invention of claim 23 are as set forth in claim 8.
It is the same as the invention of the above.

According to a twenty-fourth aspect of the present invention, in the invention of the twenty-second or twenty-third aspect, the processing for grasping the elevation data at the longitude and the latitude from the topographical map is performed by closely reading the topographical map horizontally and vertically. Processing to divide into a number of aligned rectangular regions of the same shape, and to refer to a storage medium storing elevation data for each of the divided sections, the longitude / latitude of the reference point and elevation grid points of a predetermined mesh, The process of grasping the specific rectangular area containing the longitude and latitude returned from the cursor point as the starting point, and the relationship between the longitude and latitude returned from the starting point with respect to the longitude and latitude of the reference position of the specific rectangular area A process of associating a start point with a specific grid point of a specific rectangular area, a process of grasping elevation data of the specific grid point as elevation data of a cursor point, and a start point and an end point thereafter. A process of reading the elevation value along the straight line up to the end of the section, a process of reading the elevation value by a map section following the end of the section, and And a process of reading an altitude value up to an end point by repeating the processing. The storage medium storing the boring data display program is provided.

The function and effect of the invention of claim 24 are as set forth in claim 8.
It is the same as the invention of the above.

[0053]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below. In this embodiment, it is assumed that existing map display software and a recording medium such as a CD-R @ M containing numerical map data issued by the Geographical Survey Institute are used. use. Various types of map display software are commercially available, but in order to implement the present invention, it is necessary to be able to display a map and return the longitude and latitude of a cursor of the displayed map. An example of such commercially available software is “MapDK Map” manufactured by “Increment P Corporation”. In the embodiment of the present invention, this software is obtained as a license from a manufacturer, and is integrally incorporated. However, it goes without saying that original map display software that achieves the same function may be used instead of such commercially available software. On the other hand, for a CD-R @ M containing digital map data issued by the Geospatial Information Authority of Japan, by taking in only the data head array that has been made publicly available, a necessary area of the CD-R @ M is accessed to obtain elevation data. . Thereby, the CD-R
The user is prompted to purchase a CD-R @ M so that the user can use the elevation data without copying the $ M.

Next, the header structure of the numerical map data issued by the Geographical Survey Institute will be described. The numerical map has the same longitude and latitude ranges as the 1/25000 map issued by the Geographical Survey Institute. That is, in FIG. 1, reference numeral 10 denotes one such section (section diagram). Such sections are connected seamlessly left and right and up and down, and cover the whole of Japan. In the elevation map issued by the Geographical Survey Institute, each section is 10
In the, the longitude x and the latitude y directions are each equally divided into 200, and the elevation value at the midpoint of each grid is recorded. As the data head, the number of the section (represented as i = 1, i = 2... In FIG. 1) and the coordinate point P ₀ (x
a, ya) and the coordinate point P ₁ (xb, xb) at the lower right corner. In the present invention, a coordinate point P ₀ (xa, ya) and a coordinate point P ₁ (xb,
xb) is determined by whether it is sandwiched between the longitude and latitude of the cursor point by sequentially repeating from the section of i = 1,
It is possible to know the altitude data storage section including the longitude / latitude of the cursor point.

In FIG. 1, the elevation data is sequentially stored in the longitude direction (right direction in FIG. 1) from the coordinate point P ₀ (xa, ya) at the upper left corner. , Are stored to the right from the left. By repeating this, when the coordinate point P ₁ (xb, xb) at the lower right corner is reached, the elevation data in this section ends.

Next, the configuration of the boring data will be described. In the present invention, existing boring data owned by the user is stored in a table in a predetermined format. As shown in FIG. 2, in this embodiment, as the boring data, the serial number No. of boring data (stored sequentially from No. 1), the longitude / latitude of the survey position, the survey subject, the orderer, the boring name (hole number) ), Survey date, survey depth, borehole water level, borehole elevation, N
It can be composed of value data and formation data. N
As the value data, for example, 100 converted N values are stored for each depth, and as the display formation data, for example, 100 formation codes are stored for each depth. Creation of a table of existing boring data can be configured as an independent application in the embodiment of the present invention. FIG. 3 shows a flowchart of the process in this application. In step 10, the current data number No is incremented by 1, that is, the initial value of the data number No is 0.
The data number is incremented each time one piece of boring data is entered in the table. Step 12 shows the input of the boring data into the data table of FIG. In step 14, a check is made as to whether or not the input of all boring data has been completed. If a negative determination is made, the input of boring data of the next data number is performed. If the input of all data is completed in step 14, this processing ends.

Next, a description will be given, with reference to the flowcharts of FIGS. 4 to 10, of a process for searching as a main body of software and displaying a sectional view and a column diagram in the embodiment of the present invention. Is a flow chart of the overall outline of the present invention, which is provided with steps 16 to 24 and is started by the start icon of the program. In step 16, a reference file of the elevation data is read by accessing the CD-R @ M. The reference value of the elevation data is xa (i), ya (i), xb (i), yb (i), f (i) in this embodiment.
It has become. Here, xa (i) and ya (i) are the longitude and latitude values at the upper left corner of the ith segment of the digital map (each segment is indicated by 10 in FIG. 1) stored in the CD-R @ M. , Xb (i), yb (i) are the longitude and latitude values of the lower right corner in the ith segment of the digital map, and these data xa (i), ya ( i), xb
A set of (i) and yb (i) is defined as a function f (i). That is, the function
f (i) has a one-to-one correspondence with the segment number i of the topographic map. Conversely, by referring to the function f (i), it is possible to know the longitude and latitude at the upper left corner and the longitude and latitude at the lower right corner, Elevation values of grid points at 200 equal points of longitude and latitude can be known by accessing CD-R @ M. In step 16, the longitude / latitude values xa (i) and ya (i) in the upper left corner and the longitude / latitude values in the lower right corner are read for all the divisions (all i) in the elevation map of the entire map of Japan, and the reference function f (i) is defined.

Step 18 shows a map display routine.
In this embodiment, the map display is configured by directly incorporating “MapDK Map” manufactured by “Increment P Corporation”. That is, this software has a routine that can display a map of various places in Japan with various magnifications on the screen and returns the longitude and latitude of the cursor displayed in the figure. FIG. 11 schematically shows the map display on the display, 88 shows a map display window, in the map window 90 is the sea, 92 is the shoreline, 94 is the river, 96 is the railway, 98 and 100 are the main lines. Represents a road. The cursor on the map is represented by K. The cursor K can be moved up, down, left and right by operating the scroll bar with the keyboard or mouse, and the map software executes a routine that returns the longitude and latitude on the map at the cursor point. The map software makes the window 102 on the display screen display the longitude and latitude of the map at the cursor K.

In FIG. 4, step 20 shows a process of displaying a list of boring data. In this process, the existing boring data input to the table is displayed as described with reference to FIG. In FIG. 11, a window 104 is for displaying a table of inputted boring data. In this window 104, FIG.
Following the data number from the table of existing data input according to the data structure described above, input data is also displayed in one line for each item of boring data as shown in FIG. The invisible part of the boring data can be displayed by operating the scroll buttons. In FIG. 11, black circles indicate points on the map of the existing boring data.

In FIG. 4, a process 22 shows an altitude display routine, and 24 shows a process routine at the time of menu operation. This processing will be described in detail below. FIG. 5 shows the elevation display routine in step 22 of FIG. 4 in more detail, and includes steps 26 to 34. In step 26, the longitude and latitude at the cursor (K) point are set. Is obtained. In the next step 28, the topographic map section i including the longitude and latitude at the cursor (K) point
Is grasped. As described in connection with step 16 in FIG. 4, the reference function f (i) of the elevation data read from the CD-R @ M is the longitude / latitude x at the upper left corner in that section.
a (i), ya (i) and the longitude / latitude xb (i), yb (i) of the lower right corner and the section number i. Therefore, it is determined whether the longitude / latitude of the cursor is included between the longitude / latitude of the upper left corner and the longitude / latitude coordinates of the lower right corner while incrementing the map number i, and the value of i when a positive determination is obtained is shown in FIG. The longitude returned from the cursor K position obtained in step 26 of step 4
It is possible to know the map section including the latitude.

The next step 30 is the longitude of the cursor point K.
The elevation map read in step 28, including latitude
Of the specific grid point of the elevation map section corresponding to the cursor point K
Grasp is performed. That is, in FIG. 12, P (x, y) is
-The longitude and latitude of the sol point, P ₀(xa (i), xa (i))
In step 28, the longitude / latitude P (x, y) of point K is included.
Assume that the coordinates of the upper left corner of the grasped map section i. Then
These two points P₀, P, the difference X in longitude value and the difference Y in latitude value
When calculated, the difference X, Y is calculated from the upper left corner in the elevation map i
Is the displacement of longitude and latitude. On the other hand,
Is divided into 200 equal parts in a rectangular cell with a specified longitude and latitude width.
Altitude data of grid points are stored in order from the upper left.
X and Y positions can correspond to the elevation value storage order.
To read the elevation values in this order from CD-R @ M
Gives the altitude value. Step 32 in FIG.
Includes cursor point K due to access to CD-R @ M
Altitudes in the order corresponding to the deviations X and Y in the section map number i
This shows reading of data. In step 34 this
The display of the altitude data thus obtained is shown. In FIG.
In the above, the window 106 is obtained in this manner.
It is also used to display elevation data at the cursor (K) point.
It is.

Next, a description will be given of a retrieval and columnar diagram display routine executed by the menu processing 24 shown in FIG. FIG.
In FIG. 1, reference numeral 100 denotes a menu bar, and various processes are executed by selecting a menu displayed on the menu bar. Step 24 in FIG. 4 schematically shows the menu processing executed when the menu bar is selected. First, a quick search included in the menu will be described. A quick search is included in the menu bar, and when this menu is selected, the routine shown in FIG. 6 is executed. In step 36, the longitude (x) of the cursor point K
The latitude (y) is acquired. In step 38, a search is made for boring data having the nearest longitude / latitude to the longitude (x) / latitude (y) of the acquired cursor point K. That is, the distance between the longitude / latitude of the cursor point and the longitude / latitude of the boring data is calculated for each boring data stored in the boring data database, and the boring data having the minimum distance value is searched. Step 40
Indicates the display of boring data. In FIG. 13, 10
Reference numeral 8 denotes a window of the boring data as a result of the quick search. In this window 108, a display column 108A of the number of the retrieved boring data, a display column 108B of the longitude and latitude, and other boring data indicated by broken lines are displayed. A column is displayed, and a display column 108C of a depth, a columnar map, a stratum name, and an N value graph in the retrieved boring data is drawn. Therefore, the user can move the cursor K
The most recent boring data can be grasped immediately and visually.

Next, the condition search included in the menu will be described. In the condition search, the existing boring data is searched by adding various conditions.
The outline of the processing is shown by a flowchart. This flowchart includes steps 42 to 52. When execution of this processing is started by menu selection, a condition input screen is displayed in step 42. FIG. 14 shows a condition input window screen 110, in which input fields for various search conditions such as a subject / construction name, a survey time, a survey depth, a search direction from a cursor point, and a distance from the cursor point. Is provided. When the user performs necessary input and clicks the search start button 110A, FIG.
The process proceeds to step 44, where a search result screen is displayed. FIG. 15 shows a search result display window 112. In the search condition statement column 112A, "The depth of the survey conducted after August 1994 is 0.00m to 30.00m, and the azimuth angle is 0 ° to 18
A search condition sentence such as "data satisfying a condition of 0 ° and a radius of 1,000 or less" is displayed, and a table of the searched boring data is drawn in the column 112B. When all column diagram button 112C is clicked (YES in step 46 in FIG. 7), all column diagram display is executed (step 48). FIG. 16 schematically shows an all-column diagram display screen as a result of the execution of step 48. The column diagram of all the boring data retrieved by the search is collectively displayed together with the data number for each boring data. Also, column 112B in FIG.
When one boring data is selected and the column diagram button 112D is clicked (YE at step 50 in FIG. 7)
S) A columnar diagram of the boring data (step 52) is displayed, and the displayed content is the window 1 in FIG.
08 is the same as the display content. Clicking button 112E closes the condition search screen.

Next, when the user selects "Creation of cross section" in the menu, the cross section creation routine shown in FIGS. 8 and 9 is started. This processing includes steps 54 to 76. Step 54 shows a check as to whether or not a start point has been designated. FIG. 17 shows a cross-sectional view creation screen. The start point is indicated by S1, and when the cursor is positioned at this position and the mouse is clicked, the start point is designated. . In FIG. 8, in step 56, the longitude / latitude of S1 is acquired from the start point specified in this way. Step 58 indicates a check of designation of the end point. The cursor is moved on the map and clicked to designate the end point. In FIG. 17, S2 indicates the designated end point. In step 60, the longitude and latitude of the end point S2 are obtained. In the next step 62, the elevation map number i including the starting point S1
Is searched. This search method is shown in FIG. 18 and is the same as the method described in step 28 of FIG.
A search is made for an elevation section map i that includes the longitude / latitude of 1 between the longitude / latitude (xa, ya) at the upper left corner and the longitude / latitude (xb, yb) at the lower right corner. In step 64, conversion to a grid point in the retrieved elevation map section corresponding to the starting point S1 is performed. This conversion is the longitude of the upper left corner of the starting point longitude xb, latitude yb
xa, and deviation X, Y with respect to latitude ya. In step 66 in FIG. 9, the elevation value of the grid point corresponding to the deviation X, Y is read from the CD-ROM as the elevation value of the starting point. In step 68, it is determined whether or not the point on the straight line L from which the elevation data has been acquired is within the same map section. In the start point S1, the determination is YES, and the process proceeds to step 70, where the distance increment for one grid of the elevation map is performed. The increment value is determined from the size of one grid and the inclination of the straight line L. Then, the process proceeds to step 66 again, and the elevation data at the next grid point is obtained.

In FIG. 18, when the search along the straight line L proceeds and the search in the first map section 10-1 reaches the end of the map section 10-1, the determination in step 68 in FIG. In step 72, the next elevation map section is selected. As shown in FIG. 18, the next elevation map section is a map section 10-2 in which a straight line L connecting the start point S1 and the end point S2 intersects next.
As a result, the map section number can be grasped. In this way, after searching for a new map section 10-2, step 6
The same processing as in steps 6, 68 and 70 is repeated, and the elevation data on the straight line L on the grid point in the map section 10-2 is obtained. Similarly, in the same manner, the altitude data is acquired at grid point intervals along the straight line L in the order of the map sections 10-3, 10-4, 10-5, and 10-6. When the acquisition of the altitude data is completed up to the end point S2, the answer to step 74 is YES, so the process proceeds to step 76,
Drawing of a sectional view is performed. FIG. 19 schematically illustrates a change diagram of the altitude with respect to the distance from the start point on the straight line L connecting the start point S1 and the end point S2 drawn in this manner.

The flowchart of FIG. 10 shows a process of reading the boring data along the line segment L connecting the starting point S1 and the ending point S2 from the database and displaying the columnar diagram. Step 78 is a line segment L connecting the start point S1 and the end point S2.
Shows the extraction of all boring data at a predetermined width (for example, a width of 100 meters) along. Dashed lines on both sides of the line L in FIG. 17 schematically show the region of this predetermined width. As a method of this processing, any method can be used, but one method having a high search speed is a method in which a circle having a distance of 100 meters from the line L starting from the starting point S1 to the intersection of the adjacent circles as shown in FIG. ,... Are sequentially drawn to list all the existing boring data included in the longitude / latitude of each circle, and those having a distance from the straight line L exceeding 100 meters can be excluded.
In the figure, x indicates boring data to be excluded, and a black circle indicates boring data to be left. In FIG. 10, step 80 shows the calculation of the distance (projection distance on the straight line L) from the start point S1 along the straight line L for the extracted boring data. In step 82, the extracted data is sorted by the distance from the starting point S1. And step 8
4 shows the display of the column diagram in the boring data in order of distance. FIG. 21 shows a state in which a column diagram is pasted along with a boring data number along the cross-sectional view, and by attaching the column diagram together with the cross-sectional view, grasping of the ground condition can be visually intuitively and quickly performed. There are effects that can be performed.

[Brief description of the drawings]

FIG. 1 is a diagram schematically showing storage of elevation data in each section map in a storage medium.

FIG. 2 is a diagram schematically illustrating a storage field of boring data;

FIG. 3 is a schematic flowchart showing a procedure for inputting boring data.

FIG. 4 is a flowchart schematically showing an overall processing procedure in the map display method of the present invention.

FIG. 5 is a flowchart schematically showing an altitude display procedure in FIG. 4;

FIG. 6 is a flowchart schematically showing a procedure of a quick search process in the menu process in FIG.

FIG. 7 is a flowchart schematically showing a procedure of a condition search process in the menu process in FIG. 4;

FIG. 8 is a flowchart schematically showing a procedure of a cross-sectional view creation process in the menu process in FIG. 4;

FIG. 9 is a flowchart schematically illustrating a subsequent portion of the procedure of the cross-sectional view creation process in FIG. 8;

FIG. 10 is a flowchart schematically illustrating a procedure of a columnar diagram creation process.

FIG. 11 is a schematic view of a screen display of a program in the map display method of the present invention.

FIG. 12 is a diagram illustrating a procedure for reading an elevation value of a cursor point in a topographic map including the cursor point.

FIG. 13 is a view similar to FIG. 11, but schematically showing a state at the time of a quick search.

FIG. 14 is a diagram similar to FIG. 11, but schematically showing a search condition input window in a condition search.

FIG. 15 is a diagram schematically showing a table display window of a condition search result.

FIG. 16 is a diagram schematically showing a histogram display window of a condition search result.

FIG. 17 is a view similar to FIG. 11, but schematically showing a procedure for inputting a start point and an end point when creating a cross-sectional view.

FIG. 18 is a diagram schematically illustrating a procedure for reading altitude data along a straight line connecting a start point and an end point.

FIG. 19 is a diagram schematically illustrating an output result of an elevation map.

FIG. 20 is a diagram schematically illustrating a procedure for searching for existing boring data on both sides of a straight line connecting a start point and an end point.

FIG. 21 is a view similar to FIG. 19, but showing a state in which a columnar figure based on existing boring data is pasted on the elevation sectional view.

[Explanation of symbols]

10: Numerical map is one section (section diagram) P ₀ (xa, ya) ... Coordinate point of upper left corner in each section P ₁ (xb, xb) ... Coordinate point of lower right corner 88 ... Map window 90 ... Sea 92 ... Coastline 94 ... River 96 ... Railway 98, 100 ... Arterial road 102 ... Longitude / latitude display window of the cursor point 104 ... Drilling data display window 106 ... Elevation data display window of the cursor point 108 ... Drilling data quick search display window 110 ... Condition Input window 112: Condition search result display window K: Cursor L: Section view creation line

Claims (24)

[Claims] 1. A method of dividing a topographic map into a number of rectangular regions having the same shape, and displaying the elevation on a map using a storage medium storing elevation data for each grid point for each of the divided rectangular regions. The altitude data in the storage medium can be referred to, a map is displayed on the screen, a cursor is displayed on the screen, and the longitude and latitude at the cursor point on the displayed map are returned. A specific rectangular area that includes the specified longitude and latitude is determined, and the specific rectangle corresponding to the cursor point is determined from the relationship between the longitude and latitude of the reference position in the specific rectangular area and the longitude and latitude returned from the cursor point. A method comprising: grasping a specific grid point of an area; reading and displaying altitude data of the specific grid point as altitude data of a cursor point; 2. A large number of boring data including a column map in longitude and latitude, a geological name, an N value, and the like are input to a table,
In addition, a map is displayed on the screen, a cursor is displayed on the screen, the longitude and latitude at the cursor point on the displayed map are returned, and boring data related to the cursor point is searched, and the searched boring is performed. A method comprising displaying data on a screen. 3. The method according to claim 2, wherein the search for the boring data related to the cursor point is a search for the boring data closest to the cursor point, and the search for the boring data closest to the searched cursor point is performed. The method characterized in that it is displayed in the. 4. The method according to claim 2, wherein the search for boring data related to the cursor point is a search for boring data located within a predetermined range with respect to the cursor point, and the search for boring data is performed within a predetermined range with respect to the searched cursor point. A method wherein all the boring data located are displayed on a screen. 5. The method according to claim 4, wherein the display of the boring data located within a predetermined range with respect to the cursor point is performed by a list. 6. The method according to claim 4, wherein the display of the boring data located within a predetermined range with respect to the cursor point is performed by a diagram such as a histogram. 7. A map is displayed on a screen, a cursor is displayed on the screen, and longitude and latitude at a cursor point on the displayed map are returned. Further, elevation data in longitude and latitude from the topographic map is displayed. Can be read, specify at least two points on the map with the cursor, read the elevation value for the longitude and latitude along the line connecting the specified points, and read the read altitude value for the distance between the specified points And displaying it as a graph on the screen. 8. A large number of boring data including a column map in longitude and latitude, a geological name, an N value, and the like are input to a table,
In addition, a map is displayed on the screen, a cursor is displayed on the screen, the longitude and latitude at the cursor point on the displayed map are returned, and the elevation data at longitude and latitude can be read from the topographic map , Specify at least two points on the map with the cursor, read the elevation values for each longitude and latitude on the line connecting the specified points, and plot the read elevation values against the distance between the specified points as a graph on the screen A method of searching, displaying boring data at longitude and latitude along a line connecting designated points, and displaying the searched boring data on a graph. 9. The invention according to claim 7, wherein the topographic map is divided into a plurality of rectangular regions having the same shape in order to execute reading of elevation data at longitude and latitude from the topographic map. It is possible to refer to the storage medium storing the elevation data for each predetermined grid point for each section, grasp a specific rectangular area including the longitude and latitude returned from the cursor point as a starting point, and determine the specific rectangular area. From the relationship between the longitude and latitude returned from the cursor point with respect to the longitude and latitude of the reference position, the starting point is made to correspond to the specific grid point of the specific rectangular area, and the elevation data of the specific grid point is used as the elevation data of the starting point. The elevation value is read along the straight line connecting the start point and the end point to the end of the section, and when the end of the section is reached, the elevation value is read using the map section that follows this section. A method of reading altitude values up to an end point by repeating the above. 10. A system that divides a topographic map into a number of rectangular regions having the same shape, and displays elevation on a map using a storage medium storing elevation data for each grid point for each of the divided rectangular regions. Means for making it possible to refer to elevation data in a storage medium, means for displaying a map on a screen, means for displaying a cursor on a map, and returning longitude and latitude at a cursor point on the displayed map. Means, means for grasping a specific rectangular area including the longitude / latitude returned from the cursor point, and the relationship between the longitude / latitude of the reference position of the specific rectangular area and the longitude / latitude returned from the cursor point Means for associating a cursor point with a specific grid point of a specific rectangular area, and means for displaying the altitude data of the specific grid point as the altitude data of the cursor point. And the system. 11. A table means for inputting a large number of boring data including a column map in longitude and latitude, a geological name, an N value, etc., a means for displaying a map on a screen, and a cursor displayed on a map Means for returning the longitude and latitude at the cursor point on the displayed map, means for searching for boring data related to the cursor point from the table means, and displaying the searched boring data on the screen. And a means for performing the above. 12. A means for displaying a map on the screen, a means for displaying a cursor on the screen, a means for returning the longitude / latitude at a cursor point on the displayed map, and Means for reading elevation data;
Means for designating at least two points on the map with a cursor, means for reading elevation values for longitude and latitude along a line connecting the designated points, and means for reading the read elevation values for the distance between the designated points Means for displaying a graph on a screen. 13. A table means capable of inputting a lot of boring data including a columnar map in longitude and latitude, a geological name, an N value, etc., a means for displaying a map on a screen, and displaying a cursor on the screen. Means for returning the longitude and latitude at the cursor point on the displayed map, means for reading elevation data at longitude and latitude from the topographic map, and at least two points on the map by the cursor. Means for specifying an altitude, means for reading elevation values for longitude and latitude along a line connecting designated points, and means for displaying the read elevation values as a graph on a screen with respect to the distance between designated points And means for searching for boring data at longitude / latitude along a line connecting designated points, and means for displaying the searched boring data on a graph. System to do. 14. The invention according to claim 12 or 13, wherein the means for reading the elevation data at the longitude and latitude from the topographical map divides the topographical map into a plurality of rectangular regions having the same shape. Means for making it possible to refer to a storage medium storing elevation data for each grid point for each rectangular area, means for ascertaining a specific rectangular area containing the longitude and latitude returned from the cursor point as a starting point, Means for associating the starting point with a specific grid point of a specific rectangular area based on the relationship between the longitude and latitude returned from the starting point for the longitude and latitude of the reference position of the rectangular area, and the altitude data of the specific grid point as the starting point Means for grasping as altitude data, means for reading the altitude value along a straight line connecting the starting point and the ending point to the end of the section, and when the end of the section is reached, continue to this. A means for reading an altitude value according to a map segment, and a means for reading the altitude value until the end point by repeating the above. 15. A program that divides a topographic map into a number of rectangular areas having the same shape, and displays elevation on a map using a storage medium storing elevation data for each grid point for each of the divided rectangular areas. Then, a process for making it possible to refer to elevation data in a storage medium, a process for displaying a map on a screen, a procedure for displaying a cursor on a map, and returning longitude and latitude at a cursor point on the displayed map The process, the process of grasping a specific rectangular area containing the longitude and latitude returned from the cursor point, and the relationship between the longitude and latitude of the reference position of the specific rectangular area and the longitude and latitude returned from the cursor point The method further includes a process of associating a cursor point with a specific grid point of a specific rectangular area, and a process of displaying the altitude data of the specific grid point as the altitude data of the cursor point. The program to sign. 16. A process for inputting a large number of boring data including a columnar map in longitude and latitude, a geological name, an N value, etc., a process for displaying a map on a screen, and displaying a cursor on a map. Processing, processing for returning the longitude and latitude at the cursor point on the displayed map, processing for searching for boring data related to the cursor point, processing for displaying the searched boring data on the screen, and A program characterized by having. 17. A process for displaying a map on a screen, a process for displaying a cursor on a screen, a process for returning longitude and latitude at a cursor point on a displayed map, and a process for displaying longitude and latitude from a topographic map. A process for reading altitude data in the map, a process for designating at least two points on a map with a cursor, a process for reading altitude values for longitude and latitude along a line connecting designated points, Displaying the altitude value as a graph on a screen with respect to the distance between designated points. 18. A table process capable of inputting a large number of boring data including a column map in longitude and latitude, a geological name, an N value, etc., a process of displaying a map on a screen, and displaying a cursor on a screen. Processing to return the longitude and latitude at the cursor point on the displayed map; processing to enable reading of elevation data at longitude and latitude from the topographic map; and at least two points on the map by the cursor. Processing for reading the elevation value for each longitude and latitude on a line connecting the designated points, processing for displaying the read elevation value as a graph on the screen with respect to the distance between the designated points, A process for searching for boring data at longitude and latitude along a line connecting designated points, and displaying the searched boring data in a graph. G. 19. The invention according to claim 17 or 18, wherein the processing for grasping the elevation data at the longitude and the latitude from the topographic map is performed by dividing the topographic map into a plurality of rectangular regions having the same shape. A process for making it possible to refer to a storage medium storing elevation data for each grid point for each section, a process for grasping a specific rectangular area containing the longitude and latitude returned from the cursor point as a starting point, A process of associating the start point with a specific grid point of a specific rectangular area based on the relationship between the longitude and latitude returned from the start point with respect to the longitude and latitude of the reference position of the rectangular area, and the altitude data of the specific grid point as the altitude of the start point The process of reading as data, the process of reading the altitude value along the straight line connecting the start point and the end point up to the end of the section, and the map section to be continued when the end of the section is reached A program for reading an altitude value according to the above, and a process for reading the altitude value until the end point by repeating the above process. 20. A program for dividing a topographic map into a number of rectangular areas having the same shape, and displaying the elevation on a map using a storage medium storing elevation data for each grid point for each of the divided rectangular areas. A storage medium, a process of making it possible to refer to elevation data in the storage medium, a process of displaying a map on a screen, a procedure of displaying a cursor on the map, and a longitude at a cursor point on the displayed map・ The process of returning the latitude, the process of grasping the specific rectangular area including the longitude and latitude returned from the cursor point, the processing of the longitude and latitude returned from the cursor point with respect to the longitude and latitude of the reference position of the specific rectangular area. The process of associating a cursor point with a grid point in a specific rectangular area based on the relationship with latitude, and reading and displaying the elevation data of the grid point corresponding to the cursor point as the elevation data of the cursor point Storage medium storing a program having a process of performing 21. A table process for inputting a large number of boring data including a columnar map in longitude and latitude, a geological name, an N value, etc., a process for displaying a map on a screen, and displaying a cursor on a map Processing to return the longitude and latitude at the cursor point on the displayed map; processing to search for boring data related to the cursor point;
A storage medium storing a program having a process for displaying searched bowling data on a screen. 22. A process for displaying a map on the screen, a process for displaying a cursor on the screen, a process for returning the longitude and latitude at a cursor point on the displayed map, and a process for displaying the longitude and latitude from the topographic map. A process for reading altitude data in the map, a process for designating at least two points on a map with a cursor, a process for reading altitude values for longitude and latitude along a line connecting designated points, A program for displaying the altitude value as a graph on a screen with respect to the distance between designated points on a screen. 23. A table process capable of inputting a large number of boring data including a columnar map in longitude and latitude, a geological name, an N value, etc., a process of displaying a map on a screen, and displaying a cursor on a screen. Processing to return the longitude and latitude at the cursor point on the displayed map; processing to enable reading of elevation data at longitude and latitude from the topographic map; and at least two points on the map by the cursor. , Processing to grasp the elevation value for each longitude and latitude on the line connecting the designated points, and processing to display the read elevation value as a graph on the screen with respect to the distance between the designated points. And a program having a process of searching for boring data at longitude and latitude along a line connecting designated points and a process of displaying the searched boring data on a graph. Storage media. 24. In the invention according to claim 22, the processing for grasping the elevation data at the longitude and the latitude from the topographic map is performed by dividing the topographic map into a plurality of rectangular regions having the same shape, and performing the division. A process that makes it possible to refer to the storage medium that stores elevation data for each longitude and latitude of the reference point and the elevation grid point of a predetermined mesh for each section, and a specification that includes the longitude and latitude returned from the cursor point as the starting point A process of grasping the rectangular region of the specific rectangular region, and a process of associating the starting point with the specific grid point of the specific rectangular region based on the relationship between the longitude and latitude returned from the starting point for the longitude and latitude of the reference position of the specific rectangular region A process of grasping the elevation data of the specific grid point as the elevation data of the cursor point, and a process of reading the elevation value along the straight line connecting the start point and the end point to the end of the section. And processing for reading an altitude value when the end of the section is reached according to a map section that follows this section, and processing for reading an altitude value until the end point by repeating this process thereafter. A storage medium storing a program characterized by the above-mentioned.