JP2001117488A - Map display method and device - Google Patents

Abstract

(57) Abstract: An object of the present invention is to provide a map display method and apparatus capable of easily and promptly displaying a map of an arbitrary scale using map data of a reference scale which is a single scale. is there. According to the present invention, data conversion means executes predetermined thinning-out processing for map data of a single reference scale stored as a reference in a map data file at different arbitrary scales. To create map data of a plurality of different scales. The map drawing means 106 selects one map data of an arbitrary scale from a plurality of map data of different scales and displays the map data on the display device 112.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a map display method and apparatus for displaying a map on a display device using map information converted into digital information.

[0002]

2. Description of the Related Art In general, a route plan for a delivery business of oil and luggage is performed by displaying a map on a display device using digitally converted map data. The map describing the delivery route is copied and given to the driver who performs the delivery business.

[0003] By the way, the map data of a map used for such a delivery business is of a fixed scale created by a map content creation company. Usually the type of road,
Map data with a scale of 1 / 25,000, whose name and distance are known, is used.

[0004] In recent years, the delivery business has shifted from regional delivery to nationwide delivery. For this reason, a route map from a regional map to a national map is required for the route planning of the delivery business. Specifically, a map with a wide scale from a scale of about 1/1000 to a scale of 1/10000 for displaying as a national map is required.

[0005] To display a map with a scale of 1/10000 to 110 million using map data of 1 / 25,000 which is a fixed scale (standard scale), a thinning process is performed. Can be considered. For example, Japanese Patent Application Laid-Open No. 7-37067 discloses that the map data is thinned out and displayed.

[0006]

In the prior art, since only a specific map set at the time of thinning processing can be displayed, when the map is enlarged, the shape of roads and facilities becomes coarse, the appearance of the map becomes poor, and the reduced map is used. Is displayed, the shapes of roads and facilities become unnecessary and detailed, and the drawing speed is reduced.

For this reason, in a map system which handles enormous map data throughout Japan and displays the data at a wide scale from a scale of about 1/1000 to 1/1100, the speed of the map display is limited. Since it increases in proportion to the map area, it is extremely difficult to enlarge and reduce the map at a practical speed.

For a user who plans a delivery route using a map system in the delivery business, a map of an arbitrary scale is displayed simply and quickly using map data of a fixed scale (reference scale). There is a strong demand for what can be done.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has as its object to easily and quickly display a map of an arbitrary scale using map data of a reference scale which is a single scale. A map display method and apparatus are provided.

[0010]

A feature of the present invention is that a plurality of different map data of a single reference scale, which is a reference, is subjected to a predetermined thinning-out process for each different arbitrary scale to execute a plurality of different processes. An object of the present invention is to create map data of an arbitrary scale, select one of the map data of an arbitrary scale from the created map data of a different scale, and display it on a display device.

According to the present invention, a plurality of map data having different arbitrary scales are created by executing a predetermined thinning process for map data having one reference scale for each different arbitrary scale. One map data of an arbitrary scale is selected from the map data of different arbitrary scales and displayed on the display device. Therefore, it is not necessary to perform the thinning process each time a display is performed, and a map at an arbitrary scale can be easily and quickly displayed using the map data at the reference scale.

[0012]

FIG. 1 shows an embodiment of the present invention.

In FIG. 1, a map data file 101
Stores map data (vector data) converted into digital information at a fixed scale (reference scale) created by a map content creating company. The scale of the map data stored in the file 101 is, for example, 1 / 25,000.

The conversion rule setting means 105 is set with map data conversion rules by the operation input means 111, and stores the conversion rules in the conversion rule storage means 102. The data conversion unit 103 thins out the map data stored in the map data file 101 based on the conversion rule set in the conversion rule storage unit 102, and stores the result in the first map storage unit 104. Store.

The first map storage means 104 is a large-capacity storage device such as a hard disk, and can store a plurality of map data. It should be noted that the first map storage means 104 can be shared by the map data file 101.

The display rule setting unit 110 sets a display rule of map data by the operation input unit 111 and stores the display rule in the display rule storage unit 102. The map drawing means 106 extracts map data to be displayed from the first map storage means 104 in accordance with the display rule stored in the display rule storage means 108 for the map position and the display scale designated by the operation input means 111. Are stored in the second map storage unit 107 and are drawn in the frame memory 109.

The map drawing means 106 is the first map storage means 1
When extracting the map data from the map data 04, the selection of the map data is performed according to the indicated display method. The map drawn in the frame memory 109 is displayed on a display unit 1 such as a CRT.
12 is indicated.

Next, the operation will be described with reference to FIGS.

FIG. 2 is a flowchart showing the operation of the data conversion means 103, and shows the operation of storing the map data of the map data file 101 provided by the map content creation company or the like in the first map storage means 104. .

First, a thinning rule is read from the conversion rule storage means 102 inputted by the conversion rule setting means 105 constituted by a text editor (step 201). The thinning rule is shown in FIG. 4 and is described in a text file and can be easily changed.

The map data is created for each scale used,
A map of one expression is created for one scale. For this reason, a plurality of map data are created from the map data of one reference scale, and a map number is assigned to each of them.

At each scale, the editor describes the interval between points that may be omitted for polygonal figure data representing roads, prefectural borders, etc., and the type of data used for map representation as an error distance. . The thinning of points such as a polygonal line is performed, for example, by selecting two adjacent points in a row of points constituting the polygonal line.
When the interval between two points is equal to or less than the within-error distance, point thinning is realized by deleting points appearing later.

In the example shown in FIG. 4, when map data of map number 1 is created as a map with a scale of 1 / 1,000,000, points having an interval of 100 m or less are thinned out, and the expressway and prefecture name are registered. , National roads are not registered. Similarly,
For a map of 1 / 500,000, the distance within error is 5 as map number 2.
0m, Expressway, National highway, Prefectural name registered, and 1/1
A map of 100,000 has a map number 3 with an error distance of 10 m,
Expressways and national roads are registered, and prefecture names are not registered.

In step 202, the map data to be registered next is read from the file 101, and in step 203, the format is converted into a format suitable for the first map storage means 104. In step 204, it is determined whether or not the map data is a registration target. In step 205, if the data is graphic data such as a polygonal line or a polygon, a point thinning process as shown in FIG. Step 206). The simplified map data that has been thinned out in step 206 is stored in the first map storage unit 104 in step 207.

If it is determined in step 208 that the processing from step 204 to step 207 has been performed for all the scales to be created, the next map data (data of the reference scale ratio) is read from the map data file 101 and the steps from step 202 to step 202 are performed. Step 208 is repeatedly executed.

When the processing has been completed for all the map data (step 209), all the required scale data of the map data are registered in the first map storage means 104. Map data as shown in FIG. 5 is registered for each map number.

FIG. 5A corresponds to map number 1 in FIG.
The polygonal frame is the border of the prefecture, the polygonal line is the expressway, and the name of the prefecture is registered. FIG. 5B corresponds to map number 2 in FIG.
(A) The prefectural border and the expressway with more points are registered, the national road is registered as a thinner line, and the municipal border is registered as a dotted line. Similarly, FIG. 5C corresponds to map number 3 in FIG. 4, and more detailed prefectural borders and expressways are registered, but the prefecture names are not registered.

FIG. 5D shows the configuration of the map storage table of the first map storage means 104. One line indicates the storage state of the map data at a specific scale.

In FIG. 5 (d), the map data of FIG. 5 (a) is stored in the row of map number 1, where a single polygonal line is registered as an expressway, and the number of coordinate points constituting this is 3 is shown. National roads and street names, facilities,
The number of registered town boundaries is 0, and one prefecture name is registered. The prefectural border has one polygonal line and seven coordinate points.

The map number 2 has one expressway, which is the same as the map number 1, but has seven votes, which is larger than the map number 1. This is because the coordinates within the error in the map number 2 are smaller than those in the map number 1, and thus the thinned coordinates are small. As described above, the data to be thinned out increases as the distance within the error increases, and the figure is simplified. Similarly, the map data of FIG. 5C is registered as map number 3.

FIG. 3 is a flowchart showing the operation of displaying a map on the display means 112 by the map drawing means 106.

In FIG. 3, first, in step 301, the operation input means 11 constituted by a mouse or a keyboard
In step 1, the user inputs the position and scale of the map to be displayed. In step 302, display rules are read from the display rule storage means 108 created as a file on the disk by the display rule setting means 110 constituted by a text editor.

The display rules are as shown in FIG. 6, and are described in a text file and can be easily changed by an editor. It is described for each scale of the map data to be displayed. For example, in FIG. 6, 1/100 of the smallest scale is described.
When displaying less than 10,000 map data, map number 1
Map number 2 when displaying at / 1,000,000 to 1 / 100,000
Is displayed by using the data of the map number 3 when it is displayed in 1 / 100,000 or more.

In step 303, it is determined whether or not the map data to be displayed is in the second map storage means 107. If there is, the flow shifts to step 304 to read the map data and draw in the frame memory 109 in step 308. . If it is determined that it is not step 303, map data is read from the first location storage unit 104 in step 305.

In step 306, the map data of the map number designated for each type of map graphic data is retrieved from the first map storage means 104 and provided to the map drawing means 106. The map drawing means 106 stores the map data given in step 307 in the second map storage means 107 and draws the map data in the frame memory 109 in step 308. The map data drawn in the frame memory 109 is displayed on the display unit 111 in step 309.

The map thus displayed on the display means 111 is displayed as shown in FIG. 7A when the scale is 1 / 1,000,000, and the number of figures in the display range at this time is two broken lines. (1 highway, 1 prefectural border), 10 coordinates, 1 character string (1 prefectural name).

At the scale of 1 / 500,000, it is displayed as shown in FIG. 7 (b), and the number of figures in the display range at this time is 3 broken lines.
Books (one highway, one prefectural border, one town border), 29 coordinates
The point and character string are 1 (one town name).

FIG. 7 (c) is displayed at a scale of 1/10. At this time, the number of figures in the display range is three broken lines (one highway, one prefectural border, one town border), and coordinates. 132 points,
The character string becomes 0.

As described above, by creating map data in accordance with each scale and selecting the map data according to the scale to be displayed, the amount of data to be drawn does not increase even if the display range is widened. Large-scale enlargement and reduction can be performed at high speed.

As described above, according to the present invention, a plurality of map data having different arbitrary scales are created by executing a predetermined thinning-out process for map data having one reference scale for each different arbitrary scale. One map data of an arbitrary scale is selected from a plurality of created map data of an arbitrary scale and displayed on a display device. Therefore, it is not necessary to perform the thinning process each time a display is performed, and a map at an arbitrary scale can be easily and quickly displayed using the map data at the reference scale.

[0041]

According to the present invention, map data is converted from map data at one reference scale to one arbitrary scale,
There is no need to perform a thinning process every time a wide range of maps of an arbitrary scale is displayed, and a map of an arbitrary scale can be easily and quickly displayed using map data of a reference scale.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of the present invention.

FIG. 2 is a flowchart for explaining the operation of the present invention.

FIG. 3 is a flowchart for explaining the operation of the present invention.

FIG. 4 is an explanatory diagram of a thinning rule according to the present invention.

FIG. 5 is an explanatory diagram of a result of a thinning process according to the present invention.

FIG. 6 is an explanatory diagram of a display rule according to the present invention.

FIG. 7 is an explanatory diagram of a display result according to the present invention.

[Explanation of symbols]

101: Map data file, 102: Conversion rule storage means, 103: Data conversion means, 104: First map storage means, 105: Conversion rule setting means, 106: Map drawing means, 107: Second map storage means, 108 ... Display rule storage means, 109: frame memory, 110: display rule setting means, 111: operation input means, 112: display means

Claims (6)

[Claims] 1. A display device for displaying digital map data on a display device, wherein a predetermined thinning-out process is performed on map data of one reference scale for each different scale. A plurality of map data of different arbitrary scales, and one map data of an arbitrary scale is selected from the created map data of different arbitrary scales and displayed on the display device. Map display method. 2. The method according to claim 1, wherein the digitalized vector map data is displayed on a display device according to a predetermined rule for each different scale factor with respect to one reference scale vector map data. A thinning process is performed to create a plurality of different scaled vector map data of a smaller scale than the reference scale, and one created scaled vector map is created from the created plurality of different scaled vector map data. A map display method, wherein data is selected and displayed on the display device. 3. The method according to claim 1, wherein the hierarchically managed vector map data is enlarged or reduced on a display device and displayed on a display device. A thinning process is executed in accordance with a predetermined rule to create vector map data of a plurality of different scales smaller than the reference scale, and necessary from the created vector map data of a plurality of different scales. A map display method comprising: selecting one vector map data having an arbitrary scale factor to be displayed on the display device according to a predetermined rule. 4. A map display device for displaying digital map data on a display device, wherein a predetermined thinning-out process is performed on a reference one scale data at a different arbitrary scale factor. A plurality of map data of different arbitrary scales, and one map data of an arbitrary scale is selected from the created map data of different arbitrary scales and displayed on the display device. Map display device. 5. A file device for storing digitally converted map data of one reference scale, a display device for displaying map data, and operation input means for giving an operation command for the map data to be displayed on the display device. And data conversion means for executing a predetermined thinning process for each different arbitrary scale using the map data of the reference scale to create a plurality of map data of different arbitrary scales, and designated by the operation input means. And a map drawing means for selecting one of the plurality of different scales of map data and displaying the map data on the display device. 6. A file device for hierarchically storing vector map data of one reference scale, a display device for displaying the vector map data, and an operation of giving an operation command for the vector map data to be displayed on the display device. Using the input means and the vector map data of the reference scale, a thinning process is performed in accordance with a predetermined rule for each different scale to generate a plurality of vector map data of different scales, and the file device or A data conversion unit to be stored in a storage device, and a map to select one of the plurality of map data items having different scales specified by the operation input unit and display the map data on the display device. A map display device comprising: a drawing unit.