JPH03136087A - Detailed destination map display device - Google Patents

Abstract

PURPOSE:To eliminate the display of unnecessary part of map information and to display a map rapidly and understandably more than ever by providing an area deciding device. CONSTITUTION:The map information is stored in a storage device 2 and divided into groups such as a road group, a river group and a house group, which are given as vector data shown by, e.g., a coordinate string between a start point and an end point. A control device 5 reads out the map information from the storage device 2 and displays every group, which should be surely displayed, in a display device 1. As for other groups, an area deciding device 4 decides whether or not their coordinate data read out from the storage device 2 is that in a prescribed area 4. If the data is that in the prescribed area, it is displayed in the display device 1, whereas if the data is that out of the prescribed area, it is not displayed. Thus, the unnecessary map information can be eliminated, the time for displaying the map is shortened, and an easily understandable map can be obtained.

Description

[Detailed description of the invention] [Industrial application field] The present invention is achieved by adding a %l area determination device.

The present invention relates to a detailed destination map display device that displays a detailed map of the vicinity of the destination and a simplified map of areas far from the destination.

[Conventional technology]

FIG. 6 shows a schematic configuration of a conventional map display device.

1 is a display device that displays map data; 2 is a storage device that stores the map data in the form of a coordinate string; and 3 is a control device that controls the entire system. In the conventional map display device, as shown in the flowchart of FIG. 7, all the map information expressed by the coordinate string read from the storage device 2 is displayed as is.

(Problems to be Solved by the Invention) A conventional map display device is a device that displays all map information read from a storage device as it is.

When the map information itself is detailed, the system displays unnecessarily detailed map information, which has the disadvantage that it takes time to display all of the information.

An object of the present invention is to eliminate display of unnecessary portions of map information by providing an f+i area determination device.

To provide a detailed destination map display device that displays a map faster and easier to understand.

[Means for solving problems]

FIG. 1 shows a detailed destination map display device of the present invention.
2 is a display device that displays map data, and 2 is a storage device that stores map data in the form of a coordinate string.

4 is a memory bag! A region determination device 5 determines whether the coordinate string read out from 2 falls within a predetermined region, and a control device 5 controls the entire system.

[Function] In the destination detailed map display device of the present invention, the map information taken out from the storage device 2 is filtered by the area determining device 4, and the map information in the area far from the destination is sifted and stored in a restricted hierarchy. Display only map information.

By displaying map information for areas near the destination at all levels, a map that is faster and easier to understand can be displayed.

【Example〕

The map information stored in the storage device 2 is divided into layers such as road layer, river layer, and house layer, as shown in FIG. It will be done. The control device 5 is.

The map information is read from the storage device 2, and all layers that must be displayed (for example, only the road layer) are displayed on the display device 1, and other layers are displayed on the el
The area determining device 4 determines whether the coordinate data read from the storage device 2 is within a predetermined area, and if it is within the predetermined area, it is displayed on the display device 1. If the data is outside the predetermined area, it will not be displayed.

FIG. 3 is a diagram illustrating criteria for determining whether or not a coordinate string read from the storage device 2 is a point within a predetermined $I area. p (coordinates (xo, yO)) is the destination.

r is the radius of the area centered on the destination p, a (coordinates (xi
, yl)) is the starting point within the area of destination p, b(coordinates (X1
', yl')) is the end point in the area of destination p, c (coordinates (
X2. Y2)) is the starting point within the area of destination p, d(coordinates (
χ2°, y2″)) is the end point outside the area of destination p, e (coordinates (x3.y3)) is the starting point outside the area of destination P, f (coordinates (X3', y3°)) is the destination end point outside the region of p, g
(coordinates (x4.y4)) is the starting point outside the area of destination p, h
(coordinates (x4', y4')) is the end point outside the area of destination p, 9 (coordinates (xq, yq)) is the vector cd and destination P
The intersection point with a circle of radius r centered at S (coordinates (xs, y
s)) and t (coordinates (xt, yt)) indicate the intersection of vector ef and a circle with radius r centered on destination P.

FIG. 4 shows a processing flowchart in the area determination device. After examining the process (1) and process (2) shown in FIG. In other words, like vector ab, the coordinates of the starting point and ending point are
If they are both included in an area with a radius r centered on the destination p, they are directly displayed on the display device 1 (processing
(proceed to), in process 2, if one point is included in an area with radius r centered on destination P, as in vector cd, then vector cd and radius centered on destination p, as in process 2, The intersection point of r with the circle is found, and in process (2), a vector cq connecting a point C in the area and the intersection q is displayed on the display device 1. As a result of process (2), vector ef and vector gh, both the start and end points have a radius r centered on the destination P.
If it is not included in the area, find the intersection of the vector ef and vector gh with the radius r centered on the destination p, as in process (2), and if two intersections are obtained as in process (2), , In the process [phase], the vector connecting the intersection points is displayed on the display device l. Also, if no intersection is obtained, 1
Nothing is displayed on the display device 1. Since the vector ef of the oral tradition shown in FIG.
to be displayed. On the other hand, since the vector gh has no intersection with a circle of radius r centered on the destination p, 1 display device 1
nothing is displayed.

FIG. 5 shows an example of a map obtained by the process of the present invention. In the diagram, p1 is the departure point, P2 is the destination, rl, r2
and cl indicate a road, respectively. In the case shown in the figure, a road c1 is displayed, and region boundary lines rl and r2 are created corresponding to the starting point p1 and the destination p2.

Then, a detailed map is drawn within the area boundaries rl and r2.

〔Effect of the invention〕

According to the present invention, since unnecessary map information can be removed, the time required to display a map can be shortened and an easy-to-read map can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a configuration of a map display device according to the present invention, FIG. 2 is a configuration of map data in a storage device, FIG. 3 is a diagram explaining criteria for region determination, and FIG. 4 is a processing flowchart in the region determination device. FIG. 5 shows an example of a map display according to the present invention, FIG. 6 shows the configuration of a conventional map display device, and FIG. 7 shows a flowchart of the conventional map display device. DESCRIPTION OF SYMBOLS 1...Display device, 2...Storage device, 4...Area determination device, 5...Control device, pl...Start point, p2...
··Destination. rl...Region boundary line, r2...Region boundary line, cl.
··road.

Claims (1)

[Claims] Coordinate string (X1, Y1) (X2, Y2)... (Xn,
A first means of displaying vector data expressed as Yn) on a map, a second means of dividing the map information into layers and storing each layer in the form of the coordinate strings mentioned above, and a second means of displaying the map with destination and details. A third means for inputting a detailed display area indicating an area to be displayed; and a fourth means for determining whether or not the coordinate string information read from the storage means is in the previously designated detailed display area. and a fifth means for reading and displaying the configuration of the map information on the display means, and when displaying the map, the fourth means determines an area near the point of interest and displays the area in the vicinity. A detailed destination map display device, characterized in that the above-mentioned layers are displayed in detail in the map, and only limited layers are displayed in areas far from the point of interest.