JP2003185461A - Unit and method for displaying map data - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a visual map system, and its displaying method which is a system for forming spectacle data from map data retrieving and displaying an attribute comprising guidance information of local produce out of spectacles, and is convenient to use. <P>SOLUTION: By uniting with a network, a computer 301 to be a user interface, a printer 304 for user service, a map data server 305 for retrieving map data and geographical information, and a CG computing server 306 which forms spectacle display data on the basis of the map data, visual guidance whose trackability and operability are excellent, can be provided. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system that uses two-dimensional map data and three-dimensional landscape data to provide tourist guidance and route guidance in normal times and evacuation guidance in the event of a disaster. The present invention relates to a method of improving operability.

[0002]

2. Description of the Related Art Displaying a landscape from a vector map,
Regarding a system for displaying multimedia information such as photographs of scenery near the route by searching the route on the map, the Proceedings of the Symposium on Functional Graphic Information "Toward advanced use of graphic image media" (199
Year 0, paragraphs 49 to 54) and IPSJ Research Materials Graphics and CAD 49-3 (1991, paragraphs 1 to 8). Also, regarding the display of graphic images, interfaces and systems in virtual reality representation of landscape data, the materials of the Automatic Control Joint Lecture (1990, items 11 to 14).
) And IPSJ Research Materials Graphics and C
Presented in AD 49-8 (1991, paragraphs 1-8).

[0003]

However, in the above-mentioned prior art, the main purpose is to convert and display a two-dimensional map into a three-dimensional landscape, and the feature of both is the topological arrangement between figures in the two-dimensional map. It does not show how to realize relational visibility and sensory comprehension on a single system on a three-dimensional map. In the virtual reality system, the movement of the object in the virtual world displayed graphically, the method of touching the object by the user using the head mounted sensor device or the glove sensor device and the display of the reaction are reported. However, it does not show how to create a new space in a virtual world represented by a landscape and display another attribute in it by using a window to display additional attributes.

The object of the present invention is to visually create a landscape using map data, and by moving the user's viewpoint, it is possible to move to and use both flat and three-dimensional media without a feeling of discomfort. It is to provide a method that allows easy selection of media and a user-friendly system and method for displaying a rectangular or rectangular parallelepiped window in a landscape and displaying documents, figures, and images in the window. The system can also be used as a virtual reality system, providing a visual interface that is convenient for users who do not use conventional devices such as keyboards and mice.

[0005]

[Means for Solving the Problems] In order to solve the above problems, when the viewpoint is directed from the upper side to the lower side, a planar map is displayed, and as the viewpoint moves in the horizontal direction, 3
Generated and displayed a three-dimensional landscape image.

As a more specific embodiment, regarding the display of attributes in a landscape, an instruction cursor is displayed, and a feature such as a building in that direction is displayed in the map data from the direction of the instruction cursor. A pointing method of searching and calculating a three-dimensional window, checking interference with features in the landscape, preferentially displaying the window, and displaying media such as figures and images in it In this way, the display can be displayed in a way that does not feel uncomfortable with the scenery. In addition, because the object that has the attribute to be displayed in the window may be hidden by another feature, searching for this from the map data and switching the hidden object display from solid display to wireframe display Highlight the target. In addition, the target for wireframe display can be passed through without checking for interference, and the target for solid display can be checked through for interference so that the user can use the system with a more realistic feeling. .

Since it is possible to smoothly move between the two-dimensional map and the three-dimensional map by moving the viewpoint, the gazing point is not lost in both cases. In addition, it can be displayed on a medium that is easy for the user to understand, which facilitates printout. The attribute added to the feature is displayed by the three-dimensional window without a sense of discomfort. Also, no complicated movements are required to select a feature. In addition, it is easy to determine whether or not to pass through because the interference check execution is switched depending on the difference between the wire frame display and the solid display form, and it is possible to avoid the discomfort felt when the scene is switched while displaying the landscape. Is.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION A conventional guidance system using map data displays a map on a graphic display as shown in FIG. The main method is to search for a route from the current location to a destination via a relay point and display the route on the map as shown in FIG. 2B, or to print out the retrieved route by overlaying it on the map. It was the purpose. See also FIG.
As shown in (c), along the calculated route or set route, multimedia information such as documents and photo images added to the feature data such as buildings in the vicinity can be displayed in a window or the like. It was presented to the user by the display means. However, in such a system, since the map data was only displayed as the background, it was difficult to confirm the actual position of oneself only with the map, and even when showing the route, the actual route was There was a drawback that it was difficult to correspond to the reality. In addition, the conventional map guidance system has a single function and can be used only in limited cases such as tourist information and directions. Therefore it could not be used for many purposes. In the present embodiment, the former problem is a method of restoring a map in three dimensions, and the latter problem is a route guidance system in normal times and evacuation guidance in an emergency such as a disaster. The multipurpose use of the function of is explained.

FIG. 3 shows a system configuration for realizing a multipurpose visual guidance system. Computer 301
Is an interface device for the user, and the map data is displayed here. The map data is vector data represented by a polygonal figure based on a coordinate sequence. The user uses the input device such as the keyboard 302 or the mouse 303 to input a keyword for map / geographical attribute search, scrolls the map or landscape, and further specifies the map data or landscape data displayed on the display 309. Output using the printer 304. The map data server 305 searches for map data to be displayed on the display 309 and feature data (attribute data) linked to the map data by using the key of the coordinates and the name input by the computer 301, and searches the network 308 via the network 308. And transfers it to the computer 301. For map data that does not exist in the map data server 305, another map data server is accessed via a network 307 such as a LAN (local area network) to search for necessary map data. Further, the map data server 305 performs simulation such as route search, attribute search and evacuation guidance using the map data. The CG / computing server 306 performs ray tracing necessary for displaying a map in a three-dimensional and shaded manner, interference check of a plurality of objects,
Computer graphics (CG) -specific processing such as hidden surface removal is performed to create a landscape. At this time, the landscape is displayed as a solid.

FIG. 4 is a system diagram configured such that the user can virtually experience visual guidance instead of using a normal display. In such a virtual experience system, the user 412 can feel as if in the world created by computer graphics. The binocular display 401 is a head-mounted display including sub-displays for the right eye and the left eye, and also detects head movements using a magnetic sensor or the like. Surround headphones 40
Reference numeral 2 is a hearing device, and if it has an echo function, it can also express the Doppler effect and the like. Further, the glove type pointing device 403 detects movements of a finger and a wrist. Map data server 408, CG / computing server 409
Has the same function as 305 and 306 in FIG. The signal of the movement of the head obtained from the binocular display 401 and the signal of the movement of the finger and the wrist obtained from the glove type pointing device 403 are the binocular display controller 4
04 and the pointing device controller 406, and is sent to the motion analyzer 407. In the motion analyzer 407, simple background data (basic background data) and data that reflects the user's movement (user motion data) are constructed, and the signals coming into the motion analyzer 407 are converted into user motion data. Reflect it and generate the movement. This data is sent to the CG / computing server 409, and more realistic background data and voice data are generated if user motion data is required, and the binocular display controller 404 and the surround headphone controller 4 are used.
05 is displayed on the binocular display 401 worn by the user 412, and a sound is emitted from the surround headphones 402. Incidentally, 411 is a network.

A method of converting between a two-dimensional two-dimensional map and a three-dimensional three-dimensional map using the system shown in FIG. 3 will be described. FIG. 5 shows an image of the flow of map display. As shown in FIG. 5A, it is assumed that the user's viewpoint is in the horizontal direction with respect to the map. At this time, it is a landscape display. Then, the cursor 5 for instructing the user's viewpoint to look downward from above
Operate 01 to move the viewpoint. At this time the landscape is
As shown in (b), the side surface of the feature becomes narrower. When the viewpoint is further moved, the landscape replaces the map as shown in FIG. This conversion of the display form is performed in a state where the landscape and the map almost overlap, so that the user does not lose sight of the target.

6 and 7 show algorithms for converting a two-dimensional map into a landscape which is a three-dimensional map. This algorithm will be described using the functional details of the system of FIG. 3 shown in FIG. A user inputs a map search key (such as his / her position) from the computer 301 (step 601 in FIG. 6). Code input for the map data server 305 to search the map data by the key input determination / coding unit 101. It is converted to (latitude / longitude, etc.) and transferred to the map data server 305, and the map data search unit 105 searches for a map corresponding to the code data (step 602). This map data is vector data and has a format as shown in FIG. This format can be expressed by two types and is identified by 1 bit of the type flag. In Type 1, the height information (Z coordinate) is added to each point, and in Type 2, the Z coordinate is added uniformly to the entire polygonal figure determined by the sequence of (X, Y) coordinates. means. The type 1 format is suitable for buildings with complex shapes, and the type 2 format is suitable for rectangular parallelepipeds such as buildings and contour lines. At this time, if the viewpoint is to see the horizontal direction (step 603), the retrieved map data or the simulation calculation unit 10
7 (described later), the map data subjected to the simulation calculation is transferred to the CG / computing server 306 by the data transfer unit 108, and the landscape data creation unit 111.
At step 604, landscape data is created by computer graphics. The function of selecting the display means according to the direction of the viewpoint is the media selection unit 109. At this time, with respect to the direction of the viewpoint, a default direction is initially set, and a three-dimensional image along that direction is displayed. The landscape data creation unit 111 performs shading by hidden surface removal and ray tracing in order to create this landscape data. The created landscape data or map data is transferred to the computer 301 and displayed on the data display unit 104 (step 605). The CG / computing server 306 also has the data transfer unit 114.
Further, the landscape data is projected on the two-dimensional plane determined by the position and direction of the viewpoint on the data display unit 104 and displayed on the display 309.

Next, the viewpoint or the viewing direction is changed to scroll the landscape data (step 606). The viewpoint position and its direction are indicated by the key input determination unit 10 for the instruction cursor.
2 or coded by the scroll key input determination unit 103. There are two scrolling methods. 1
One is landscape scrolling and the other is flat map scrolling. It is assumed that, when the map is viewed in the landscape, the viewpoint is changed to the horizontal direction (step 607).
At this time, the angle θ formed by the viewing direction and the vertical line is within the specified range.
When θ│ ≦ θth (step 60 in FIG. 7)
8), the media selection unit 109 determines that the map data should be displayed and transfers the map data to the data display unit 1
The display is controlled at 04 (step 609). Then θ
th does not necessarily have to be 0. When | θ | ≠ 0, the map data can be displayed after being subjected to the trapezoidal correction so as to match the image in the human visual field. Next, let's change the view from the vertical direction to the horizontal direction. At this time, when | θ |> Θth within the specified range of the viewpoint (step 610), the media selection unit 109 determines that the landscape data should be used for display, and the landscape data creation unit 111 converts the map data into the landscape data. (Steps 611, 614). Execute the view change scroll accompanying the view change using the data obtained in this way
(Step 612). The data display method determination unit 110,
Functions of the interference check unit 112 and the window generation unit 113 will be described later.

As a result, the transition between the two-dimensional map and the three-dimensional map can be performed without a feeling of strangeness. If you change the view abruptly between a horizontal view and a vertical view, you may lose track of your current location or your goal, but this method avoids this problem. Further, even when printing out, it is possible to output according to the user's preference.

Next, a guide method using display data will be described. One of the important contents in the guidance is a search display of detailed information of the feature. There are two ways to provide guidance, one is a method performed by the user independently, and the other is a method performed autonomously by the system. First, a method for the user to see the landscape will be described. That is, the user scrolls and searches for detailed information while viewing the stereoscopically displayed scene. Scrolling is performed by entering the seven keys shown below.

1. Forward movement, 2. Move backward 3. Move up, 4. Move down, 5. θ (Euler angle), 6. ψ (Euler angle), 7. φ (Euler angle) In order to specify a feature having detailed information, an instruction cursor 501 as shown in FIG. 5A is displayed. At this time, it is necessary to make the shape so that the direction of search can be easily understood. While scrolling, a feature is designated by this pointing cursor and an attribute which is detailed information thereof is searched for.
The attribute search display algorithm is shown in FIGS. 9 and 10.

First, the direction of the pointing cursor is set so as to select a feature (step 801). Next, a feature that matches the direction of the pointing cursor is searched. It can be determined by the Z-buffer method in computer graphics, but it can also be detected by the map data that is the basic data for landscape display, and its method will be shown.
Position 901 of the pointing cursor with respect to the direction of the pointing cursor
To set a search line as indicated by 902 in FIG. 11 (step 802). Then, the feature data intersecting with the line segment is searched while dividing the search line from the start point 901 into small portions (step 804). At this time, as shown in FIG. 12, the wireframe data 1001 of the feature (meaning the graphic data of FIG. 5), the surface data 1002, and the attribute data 10
Searching becomes easy if it has a data structure that is managed separately in 03.

First, (X, Y) in the wire frame data
Check the intersection with the search line 902 using the coordinates. Then, the surface data of the intersected feature data is linked 10
Search 04. The action of following this link is
This corresponds to searching for ID data common to the wire frame data 1001 and the surface data 1002 (see FIG. 12).
Then, the intersection of the search line added with the height and the surface is checked (step 805). If there is an intersecting point (step 806), the coordinate (X, Y, Z) value of that point is calculated, a line pattern is drawn from the point of the indicator bar to the intersection, and the feature is selected. (Step 807). This can be easily obtained because the four coordinates of the plane and the two coordinates of the line segment are known. In FIG. 11, the feature data 903, 9 are used as intersection candidates.
04 is the target of the check. It is shown that the selected feature is selected by highlighting it by changing its color or highlighting it (step 80).
8). Hereinafter, such a feature pointing method will be referred to as beam shot pointing. Such a pointing method is particularly effective in a virtual reality system. This is because the interface does not have a device such as a keyboard or mouse, and the pointing cursor is moved according to the movement of the wrist or finger.

There is a good possibility that the feature data retrieved by beam shot pointing may be obscured to a considerable extent by other feature data.
For this reason, the feature causing the concealment is changed from the solid display to the wireframe display. The selection of the feature data to be displayed in the wire frame can also be performed by using the map data. This method will be described with reference to FIG. It is assumed that the feature data 904 is retrieved in FIG.

First, a line segment is drawn from the feature point constituting the position 1101 of the pointing cursor and the searched feature 1102 to the position 1101 of the cursor, and a region surrounded by the two line segments 1103 and 1104 on the outermost side is drawn. A certain figure is searched (step 809), the surface data of the feature is erased, and only the wire frame is displayed (step 81).
0). In FIG. 13, since the features 1105 and 1106 correspond to this, the display is changed to the wireframe display. In order to perform such data display at high speed, if the wire frame data 1001 and the data of the surface 1002 are displayed with different display attributes, they can be realized by deleting only the surface data. This makes it easier to see the feature data retrieved by beam shot. This is performed by the data display method determination unit 110.

Next, the attribute data added to the feature data is retrieved to display it on the display.
The search procedure of attribute data is shown. First, the feature data retrieved by beam shot pointing is followed by a link 1005 to retrieve the attribute data 1003 (step 811) and display it on the display. There are two possible display methods. One is a method of displaying a rectangular plane window, and the other is a method of displaying a rectangular stereoscopic window. Such a window is displayed in the displayed world. Two
The dimensional rectangular window is used to display document data, two-dimensional graphic data, and image data. The three-dimensional rectangular window is used when displaying a three-dimensional figure. The window is displayed so that the selected object is not completely hidden. Here is how to calculate this region. The (X, Y, Z) of the pointed feature data is converted into the (X, Y) coordinate on the display by passing through the perspective conversion formula. A circumscribed rectangle for this feature is calculated from this (X, Y) data. Then, the display area is divided so as to consider horizontal and vertical line segments so as to pass through each side of the circumscribed quadrangle.
If the sides of the circumscribed quadrangle do not overlap the boundaries of the display area, the maximum display screen is divided into nine. If one side overlaps, it will be divided into six, if two sides overlap, it will be divided into four, and if there are three sides, it will be divided into two. In the area obtained by dividing, the area to display the window is determined by the next step.

Step 1: First, the size of the eight areas is compared with the size of the window, and if the attribute display window fits in one of the areas, one area is selected. step2: The size of the 1 × 2 area is compared with the currently focused window in order from the upper left, and if the attribute window fits in any of them, the largest one Select an area. step3: The size of the 2 × 1 area is compared with the currently focused window in order from the upper left, and if the attribute window fits in any of them, the largest one Select an area. step4: The size of the 2 × 2 area is compared with the currently focused window in order from the upper left, and if the attribute window fits in any of them, the largest one of them is selected. Select an area. step5: The size of the 2 × 3 area is compared with the currently focused window in order from the upper left, and if the attribute window fits in any of them, the largest one Select an area. step6: The size of the 3 × 2 area is compared in order from the upper left with respect to the window that is currently focused on. If the attribute window fits in any of them, the largest one of them is selected. Select an area. As a result, the maximum area for displaying the attribute is searched (step 812).

The same calculation is performed for a three-dimensional window, but a circumscribed quadrangle of a window shape obtained by using perspective transformation is calculated. The three-dimensional window can be preferentially accessed. This can be dealt with by providing the attribute data 1003 with a flag indicating access priority to the data than the landscape data (the wireframe data 1001 and the surface data 1002) that are the background. When a three-dimensional window is displayed, the window is preferentially displayed by checking the background and interference. This is performed by the interference check unit 112 and the window display unit 113 in FIG. Using the system shown in Figure 4,
Since it is possible to link the movement signal of the user's head, wrist, or finger with the movement of the pointing cursor, the pointing cursor on the display screen can be moved according to the movement of the hand. You can then access the graphics in the 3D window. After displaying the window in this manner, the attribute data is displayed in the window (step 813). An image of the actual guidance is shown in FIG. 14
In (a), a building 1203 is designated by a line pattern 1202 by beam shot pointing from the pointing cursor 1201. In FIG. 14B, the building 12
The display attribute of 03 is changed, and the buildings 1204 and 1205 concealing it are displayed in the wire frame. Further, as the attribute information, three-dimensional graphic information (here, a monument in the building 1203 is displayed) is displayed in the three-dimensional window 1207. Here, it is also possible to collectively display a plurality of windows on one display screen. At this time, s above
This can be realized by continuing steps 1 to 6 twice, and not selecting the region selected once for the second time.

By scrolling the landscape data, it is possible not only to change the user's viewpoint and the scene, but also to prevent the data from being penetrated by performing an interference check during solid display. Of course, you can always go through any solid-displayed feature without checking for collisions, but sometimes you cannot know where you are after going through the feature. For this reason, if the feature that one wishes to penetrate is searched for by the beam shot pointing previously displayed, only the wire frame data of the display data is displayed and the surface data is erased. In this way, the wireframe-managed data can pass through it, but the solid-displayed data cannot go beyond that plane due to the interference check. This makes the system more realistic and manageable. Specifically, the interference check is performed only on the surface data 902.

Next, a method for the system to guide autonomously will be described. At this time, specify your position, destination, and transit point. Then, the route is searched using the road map data. This can be obtained by using the Dijkstra method, heap method, A-star method, or the like. When the route is obtained, tag data indicating that the shape of the pointing cursor is generated on another route intersecting the route is added. Then, when the tag position is included in the landscape display range, the same shape as the instruction cursor is displayed. This pointing cursor cannot move until it is pointed.
Then, the actual pointing cursor moves along the path initially obtained, and when the feature is added, the feature is selected by beam shot pointing, and the feature is searched and displayed. As for the timing of pointing, assuming that the position of the pointing cursor that actually operates, that is, the position that actually operates is (X, Y), the feature data having coordinates inside the specified distance from that position as feature points of the figure select.

This is done as follows. Even if the coordinates (Xi, Yi) of the feature point of the feature data are one

[0027]

[Equation 1]

When the condition is satisfied, it is considered that the feature is selected, interference check is performed, and a line pattern is generated from the current position (X, Y) of the pointing cursor toward the coordinates (X, Y) of the intersection. . Then, the attribute information is displayed according to the algorithms shown in FIGS. 9 and 10. Next, when the shape of the pointing cursor appears, the pointing cursor data is beam shot-pointed, the pointing cursor that has been moving so far is erased, and the newly selected pointing cursor graphic is used as a new pointing cursor. Then, the guidance by the autonomous processing is restarted using this instruction cursor. At this time, the route search is performed again for the new destination and the passing place which has not passed through from the selected instruction cursor. In order not to select the route searched first,
The road data is blocked so that there is no road corresponding to the partial line segment extending from the instruction cursor data to the bend for the route obtained immediately before, and the route is recalculated. In this way, it is possible to prevent the same route obtained immediately before from being selected. At this time, it is also possible to enter a new place. An image of guidance by such an autonomous operation is shown in FIG. In FIG. 15A, the feature data 1302 is selected by beam shot pointing with the pointing cursor 1301, and its attribute information 1303 is displayed in the window. FIG. 15B shows that another pointing cursor graphic 1304 has been searched by beam shot pointing with the pointing cursor 1301. Figure 1
5 (c) shows the change of the guide route by selecting a new pointing cursor.

Such a visual guidance system can be used by placing it in a department store, a travel agency, a police box, or the like. In particular, by installing it at a police box, it is possible to perform tasks such as directions that are difficult for people to understand in an easy-to-understand manner.

Furthermore, such a system can be used for other purposes. For example, it is usually used for route guidance, but it can also be used as an evacuation guidance system in the event of an emergency such as an earthquake or fire. This is used in the following method.

First, a route is searched from the place where this system is currently installed to the evacuation place. Then, the simulation calculation unit 107 of FIG. 1 performs a disaster simulation. Fire disasters, floods, and earthquake simulations are currently available as disaster simulations. The initial value of the disaster simulation uses disaster measurement data that comes in through the network. This initial value comes in real time every moment, but since some simulations take time, the initial value data is corrected every time one simulation is completed. What is important here is to perform simulations and display of evacuation routes in a way that is easy for people to understand. First, to show the disaster area, change the color of the feature in the direction of the disaster in the landscape. This color should be conspicuous and unified. It is considered that people who are actually evacuating cannot afford to distinguish colors. Therefore, it is considered that people cannot afford to know the magnitude and direction of a disaster due to the difference in color. An image of an actual evacuation guidance route display is shown in FIG. An arrow 1401 indicates the evacuation direction. The feature data 1402 and 1403 are highlighted because they are in the direction of a disaster.

As described above, the visual guidance system shown above can use the function by changing its purpose such as normal time and emergency, and has a user-friendly interface. You can handle the system regardless of.

[0033]

According to the system of the present invention, it is possible to freely move back and forth between the two-dimensional map data and the three-dimensional landscape data. It is possible to output.
The two-dimensional and three-dimensional windows allow the attributes to be displayed in a form that is easy for the user to understand and that is natural.
Also, when displaying the attribute data, to prevent the feature data linked to the attribute data from being hidden as much as possible,
Both are easy to see at the same time. Since another feature data, which hides the feature data to be further highlighted, is switched to the wire frame display, the highlighting becomes more effective. By displaying the features you want to pass through in wire frame, you can move through the landscape without losing sight of the target. Further, even if the guidance is performed by the system-driven autonomous operation, the user can interactively intervene to change the guidance route, which improves the usability. In addition, this system can be used as a multi-purpose system because it can be used as a tourist guide, guide service at police box, and as an evacuation guidance route display system in the event of a disaster.

[Brief description of drawings]

FIG. 1 is a functional diagram of a visual guidance system of the present invention.

FIG. 2 is a diagram showing an example of use of a conventional guidance system.

FIG. 3 is a device configuration diagram of a visual guidance system.

FIG. 4 is a device configuration diagram of a virtual experience system in which a system user can virtually enter a landscape and experience guidance.

FIG. 5 is a diagram showing that the transition between map data and landscape data is performed without a sense of discomfort by changing the starting point.

FIG. 6 is an algorithm for performing a transition between a two-dimensional map and a three-dimensional map without a feeling of strangeness.

FIG. 7 is an algorithm for performing a transition between a two-dimensional map and a three-dimensional map without a feeling of strangeness.

FIG. 8 is a configuration diagram of map data.

FIG. 9 is an algorithm for displaying attribute information added to feature data in a landscape.

FIG. 10 is an algorithm for displaying attribute information added to feature data in a landscape.

FIG. 11 is an explanatory diagram showing a search method of feature data by beam shot pointing.

FIG. 12 is a diagram showing a management method of landscape and attribute data.

FIG. 13 is an explanatory diagram showing a method of searching for another feature data that conceals the searched feature data.

FIG. 14 is a diagram showing a specific screen image for displaying attribute information.

FIG. 15 is a diagram showing a specific screen image that the system provides guidance by autonomous operation.

FIG. 16 is a screen image when the visual guidance system is also used for evacuation guidance in the event of a disaster.

[Explanation of symbols]

101 ... Key input / coding unit, 102 ... Key input determination unit for instruction cursor, 103 ... Scroll key input determination unit, 104 ... Data display unit, 105 ... Map data search unit, 106 ... Geographic data search unit, 107 ... Simulation Calculation unit, 108 ... Data transfer unit, 109 ... Media selection unit, 110 ... Data display method determination unit, 111 ... Landscape data creation unit, 112 ... Interference check unit, 113 ... Window generation unit, 114 ... Data transfer unit.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) // G08G 1/09 G08G 1/09 FF term (reference) 2C032 HC23 HC26 HD21 2F029 AA02 AB13 AC02 AC03 AC13 AC14 AC16 AD07 5H180 AA01 BB05 EE08 FF03 FF13 FF22 FF24 FF27 FF32 FF35

Claims (6)

[Claims] 1. A map data storage means for storing map data for displaying a map, and a display means for displaying the map,
Means for receiving an instruction of a viewpoint position or a viewing direction when the map is displayed on the display means, a map creating means for creating a two-dimensional map from the map data and a three-dimensional map from the map data, and a map drawn on the three-dimensional map. A map data display device comprising: a changing unit that changes the display of a feature to a display that does not hide another feature hidden by the feature. 2. The map data display device according to claim 1, wherein the changing means switches the display of the feature to a wire frame display. 3. The changing means searches for another feature concealing the feature in the three-dimensional map having attribute information and switches the display to a wire frame display. Map data display device. 4. A means for acquiring the own position and a searching means for searching and guiding a route from the own position and a destination, and the display means displays the searched route on the map. The map data display device according to claim 1, wherein the map data display device is a map data display device. 5. A plane map or a three-dimensional map is created from the map data recorded in the recording means on the basis of an instruction of a viewpoint position or a viewing direction when a map is displayed on the display means via the input means. A map data display method for displaying on a display means is characterized in that the display of a feature drawn on the three-dimensional map is changed to a display in which other features hidden by the feature are not hidden. How to display map data. 6. A means for retrieving map data stored in a storage means, a display means for displaying a map based on the map data, and a viewpoint position or a viewing direction for displaying the map on the display means. Input means and scrolling the stereo map to the changed viewpoint position or viewing direction on the display means when a change of the viewpoint position or viewing direction is input by the input means while the three-dimensional map is displayed. The map creating means includes a map creating means for displaying, and a changing means for changing the display of the feature drawn on the three-dimensional map to a display not hiding another feature hidden by the feature. First when a two-dimensional map or a three-dimensional map is created from the map data and displayed according to the viewing direction of the map to be displayed on the display means, and the three-dimensional map is first displayed on the display means. The map data display device and displaying the three-dimensional map from the set viewpoint position.