JPH0855214A - Map display control system - Google Patents

Abstract

PURPOSE:To display a map having proper contents corresponding to a display scale (a map where map information to be displayed and map information not to be displayed are properly selected). CONSTITUTION:A map information file storage means 1 stores map information in a map information file 5. A display control information setting means 2 sets display control information in a scale management table 6. A corresponding map information extracting means 3 extracts only the map information corresponding to the display scale from the map information stored in the map information file 5 according to the scale management table 6 where display control information is set by a display control information setting means 2 and stores it in a display memory in a graphic display device 7. An extracted map information display means 4 displays the map information extracted by the corresponding map information extracting means 3 on the display of the graphic display device 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a map in a map information processing system intended for vector data (a map information processing system for expressing map information indicating roads, buildings, map symbols, characters, etc. using vector data). The present invention relates to a map display control method for controlling the display of a map.

[0002]

2. Description of the Related Art In general, a map information processing system includes a map information processing system that reads an existing map with an image scanner and processes it as raster data, and coordinate values of elements that make up the map (form elements that make up the map. Map information processing system that manages the start point and the end point of a line segment and expresses the element as vector data.

The former map information processing system (map information processing system for raster data) has a main purpose only to display a map, and displays the map on a graphic display device mounted on the vehicle to display the map. An example of application is a navigation system that provides directions. The maps targeted by this map information processing system are mainly road information, and are often relatively simple.

On the other hand, the latter map information processing system (map information processing system for vector data) has the main purpose of manipulating the map rather than displaying the map, and has a water supply facility, an electric power facility, and a gas facility. An example of application is an equipment design system for underground buried objects such as. Many maps targeted by this map information processing system are more detailed than those targeted by the former map information processing system.

As described above, the present invention is applied to the latter map information processing system.

Also, in these map information processing systems, maps are handled at various scales. That is, even when a map of the same area is displayed, it is displayed at a scale suitable for the purpose of use. In particular, in a map information processing system for vector data, an optimal scale is required at each stage of the map information operation process in equipment design, etc. It is necessary to change the scale of the target map itself.

In the map display control method in the map information processing system, either of the following two methods is often used to control the change of the map scale.

A method in which map information regarding maps of the same area is stored in a separate file for each required scale, and map information regarding maps of a designated scale is extracted and displayed each time.

As map information regarding maps of the same area, only those for a specific scale are stored in a file,
A method of displaying a map that matches the specified scale by enlarging / reducing the map of that scale.

In general, one of these two methods is used, and the present invention is directed to the map display control method.

Conventionally, in this type of map display control system, when the map is enlarged / reduced so as to fit the display scale (the scale of the map to be displayed), the map is simply enlarged / reduced as a figure. However, the display content was not changed due to the enlargement / reduction (selection of which map information should be displayed). On the other hand, in general, there is a request to display more map information when the map is enlarged and a request to omit extra map information when the map is reduced.

[0012]

In the above-mentioned conventional map display control method, since the map contents are simply enlarged / reduced and the display contents are not changed due to the enlargement / reduction, they are stored in a file. When changing the scale of the existing map to the display scale, there is a problem in that it is not always possible to obtain a map having contents that match the scale after the change. Therefore, in order to deal with such a scale change, the operator needs to "change the selection contents of the map information to be displayed and the map information not to be displayed". However, there is a drawback in that

In view of the above points, an object of the present invention is to provide a map information control system for vector data, and a map display control method for controlling a change of the scale of a map to be displayed, which corresponds to the display scale. It is to provide a map display control method capable of displaying a map having appropriate contents (a map in which map information to be displayed and map information not to be displayed are appropriately selected).

Incidentally, in the map information processing system for raster data, a measure for dealing with the same problem (a measure for displaying a map having appropriate contents according to the display scale)
As a technique, a technique according to Japanese Patent Laid-Open No. 58-122593 (graphic display device) has been proposed. This technology
“Among the map information stored in the first storage means, the map information is stored in a predetermined priority order for each scale rate from an information section predetermined according to the scale rate set by the scale setting means. A display control unit having a second storage means;
And display means for displaying the map information stored in the storage means of the ".
Page 1, left column, lines 7 to 13), the scale of the correspondence between the information section (set of dots) in the graphic memory (first storage means) and the set of dots in the refresh memory (second storage means). It is a method of changing according to the above, and it is premised that raster data is targeted. Therefore, the technique is different from the present invention in which the map information processing system for vector data is applied, in its configuration.

[0015]

A map display control system of the present invention is a map information processing system for vector data, and is a map display control system for controlling a change in scale of a map to be displayed. To a map information file, display control information setting means for setting display control information in the scale management table, and the scale management table in which the display control information is set by the display control information setting means. Based on the map information stored in the map information file, only the map information corresponding to the display scale is extracted from the map information, and the map information extracted by the map information extraction unit is displayed. Map information display means.

[0016]

In the map display control system of the present invention, the map information file storage means stores the map information in the map information file,
The map stored in the map information file based on the scale management table in which the display control information setting unit sets the display control information in the scale management table and the corresponding map information extraction unit sets the display control information in the display control information setting unit. Only the map information corresponding to the display scale is extracted from the information, and the extracted map information display means displays the map information extracted by the corresponding map information extraction means.

[0017]

The present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of a map display control system of the present invention.

The map display control system of the present embodiment comprises a map information file storage means 1, a display control information setting means 2, a corresponding map information extraction means 3, an extracted map information display means 4,
A map information file 5 set on a magnetic disk or the like, a scale management table 6, and a graphic display device 7 having a display memory 71 and a display 72 (see FIG. 5) are included.

FIG. 2 is a diagram for explaining the operation of the map information file storage means 1. Each piece of map information stored in the map information file 5 by the map information file storage means 1 has coordinate values (x-coordinates and y-coordinates of start and end points of a line segment).
It is composed of vectorized map information indicating coordinate values and the like and management information indicating scale, map information type, display color, line type, and the like.

FIG. 3 is a diagram showing the structure of the scale management table 6. The scale management table 6 is a table that has dimensions of scale items and dimensions of map information type items, and holds display control information specified by both items. In addition, "1" in the display control information indicates "display target", and "0" indicates "non-display target".

FIG. 4 is a flow chart showing the processing of the map information extraction means 3. This processing includes a scale management table reading step 401 and a map information reading step 402.
And a display target determination step 403 and a map information display memory storage step 404.

FIG. 5 is a diagram for explaining the operation of the extracted map information display means 4.

Next, the operation of the map display control system of the present embodiment thus constructed will be described.

As shown in FIG. 2, the map information file storage means 1 reads each piece of map information (vectorized map information and management information) constituting the map to be displayed and writes the map information in the map information file 5. .

The map information file storage means 1 performs a writing process to the above-mentioned map information file 5 for all map information relating to the map to be displayed.

The display control information setting means 2 sets each display control information specified by the scale item and the map information type item in the scale management table 6 (see FIG. 3). That is, when map information of a map information type (information indicating roads such as national roads and map symbols) on a map of a certain scale (1/500 and 1/1250, etc.) is to be displayed, "1" is set to the display control information specified by the scale item related to the scale and the map information type item related to the map information type. Also, when map information of a map information type on a map of a certain scale should be excluded from display,
"0" is set to the display control information specified by the scale item related to the scale and the map information type item related to the map information type. The value of each display control information is given by the operator from an input device such as a keyboard.

The corresponding map information extracting means 3 performs the following processing (see FIG. 4).

Before the map information is read from the map information file 5, the scale management table 6 is first read (step 401).

Next, each piece of map information is sequentially read from the map information file 5 (step 402).

A map to be displayed at the display scale (the display scale in the present map display given by the operator in advance) of the map information read in step 402 based on the reference of the scale management table 6 read in step 401. Information (hereinafter, "Map information corresponding to the display scale")
Is expressed) (step 40)
3).

In step 403, “the map information read in step 402 is map information corresponding to the display scale (in the scale management table 6, the scale item related to the display scale and the map information type item related to the map information type of the map information). The display control information specified by and is "1") "
If it is determined that the map information is to be displayed, the map information is stored in the display memory 71 in the graphic display device 7 (step 404) and the next map information (in the map information file 5) is stored. Control is returned to step 402 in order to read the next record).

On the other hand, in step 403, "step 402
When it is determined that the map information read in is not the map information corresponding to the display scale (the display control information is “0”) (when the map information is determined not to be displayed), Control is returned to step 402 to read the map information.

The process shown in FIG. 4 ends when all the map information (records) in the map information file 5 have been processed.

As shown in FIG. 5, the extracted map information display means 4 is displayed on the display memory 71 by the corresponding map information extraction means 3.
The map information stored in is displayed on the display 72 in the graphic display device 7. As a result, it is possible to display a map with appropriate contents according to the display scale.

[0036]

As described above, according to the present invention, the display control information is set in the map display control method for controlling the change of the scale of the map to be displayed in the map information processing system for vector data. By using the scale management table or the like, it is possible to automatically display a map having contents suitable for the display scale without the operator performing display control every time the map is displayed. That is, unlike the conventional case, the operator does not have to “change the selection contents of the map information of the display target and the map information of the non-display target at the time of changing the scale”, which improves the operability of the map information processing system. It will be possible.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment according to a map display control system of the present invention.

FIG. 2 is a diagram for explaining the operation of a map information file storage means in FIG.

FIG. 3 is a diagram showing a configuration of a scale management table in FIG.

FIG. 4 is a flowchart showing a process of a corresponding map information extracting means in FIG.

FIG. 5 is a diagram for explaining the operation of the extracted map information display means in FIG.

[Explanation of symbols]

 1 map information file storage means 2 display control information setting means 3 applicable map information extraction means 4 extracted map information display means 5 map information file 6 scale management table 7 graphic display device 71 display memory 72 display

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Claims (3)

[Claims] 1. A map information file storage means for storing map information in a map information file in a map information control system for controlling change of scale of a map to be displayed in a map information processing system for vector data. Display control information setting means for setting display control information in the scale management table, and map information stored in the map information file based on the scale management table in which the display control information is set by the display control information setting means. A map having a corresponding map information extracting means for extracting only the map information corresponding to the display scale from among the map information, and an extracted map information displaying means for displaying the map information extracted by the corresponding map information extracting means. Display control method. 2. The display control information having the dimension of the scale item and the dimension of the map information type item, which is specified by the scale item and the map information type item, is held in a table format and indicates "1" to be displayed. The map display control method according to claim 1, further comprising a scale management table that represents display control information by "0" indicating "not displayed". 3. A graphic display device having a display memory and a display, wherein the map information extraction means sets map information corresponding to a display scale in the display memory, and the extracted map information display means sets in the display memory. 3. The map display control method according to claim 1, wherein the displayed map information is displayed on the display.