JP4063176B2 - Map display device - Google Patents

Description

  The present invention relates to a map display device.

  2. Description of the Related Art Conventionally, as disclosed in Patent Document 1, for example, there is a map display device that displays a bird's-eye view (three-dimensional map) that is easy to grasp a sense of distance and is realistic. FIG. 5 is an image diagram showing a display example of the display unit of the map display device described in Patent Document 1.

The map display device displays grid lines on a road map displayed in a bird's eye view, and displays a distance D1 between grid lines in order to make it easy to grasp the actual sense of distance from the display unit.
Japanese Patent Laid-Open No. 9-237035

  However, the map display device described in Patent Document 1 has a problem that an actual distance in the depth direction or the like cannot be grasped unless the grid lines are counted, and it is difficult to intuitively grasp the sense of distance.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a map display device capable of displaying a three-dimensional map in which a sense of distance is easily grasped intuitively.

  In the map teaching apparatus according to claim 1, a display unit for displaying a three-dimensional map, map data storage means for storing map data for displaying the three-dimensional map, and a desired range of 3 using the map data. And a drawing unit for displaying a three-dimensional map on the display unit and displaying a display scale including the distance of the depth of the three-dimensional map and the distance of the three-dimensional map on the lower side and the upper side of the display unit on the display unit. It is characterized by. According to this, when a 3D map is displayed on the display unit, a display scale composed of the distance of the depth of the displayed 3D map and the distance of the 3D map on the lower side and the upper side of the display unit is displayed. Since it is displayed on the screen, the actual distance of the displayed three-dimensional map can be understood, and the sense of distance can be grasped intuitively.

  In the map display device according to claim 2, the display scale is displayed at the corner of the display unit. According to this, since the display scale is displayed at the corner of the display unit, it is possible to grasp the display scale and the like without reducing the visibility of the three-dimensional map.

Also, in the map display device according to claim 3, the display scale is, numbers, or, is characterized in that the display by the numbers and shapes. According to this, visibility can be improved by displaying the display scale with numbers , or numbers and figures.

  Hereinafter, an embodiment in which a map display device of the present invention is applied to a navigation device will be described with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of a navigation device (map display device) 1 according to an embodiment of the present invention.

  A navigation device (map display device) 1 includes a position detection unit 2, a map data storage unit 3, a switch information input unit 4, a memory unit 5, a display unit 6, an audio output unit 7, and a control circuit 8 connected thereto. .

  The position detection unit 2 includes a GPS (Global Positioning System) receiver, a gyro sensor, a vehicle speed sensor, and the like, and is a part that calculates the current vehicle position. The position detection unit 2 is configured to be usable while being interpolated because the sensors have errors of different properties. In this case, if the present location can be calculated, it is not necessary to provide all of these sensors, and any one or more sensors may be provided.

  The map data storage unit 3 is for inputting various types of map data such as road map data and landmark data for drawing landmarks on the road map to the control circuit 8. The map data storage unit 3 includes a storage medium for storing various types of map data. As the storage medium, a CD-ROM or DVD-ROM is generally used depending on the amount of data, but a memory card or hard disk is used. Such a medium may be used.

  The map data storage unit 3 stores two types of data. The first is road map data based on structured data. This structured data includes node data regarding points where a plurality of roads intersect, merge and branch, and link data regarding roads connecting the points. Here, the node data is data such as a node ID with a unique number for each node, node coordinates, a node name, a connection link ID in which link IDs of all links connected to the node are described, and an intersection type. Consists of The link data is composed of data such as a link ID with a unique number for each road, link length, start and end coordinates, road type such as expressway and general road, road width, link travel time, etc. Yes. The structured data has a hierarchical structure, and displayed links and nodes are switched in the hierarchical structure in accordance with the scale of the displayed road map. As the structured data, data covering all areas to be displayed on the map is stored in the map data storage unit 3.

  The second is road map data based on image pattern data. Examples of the image pattern data include three-dimensional road map data close to an actual landscape such as a building shape, and road map data using satellite photographs and aerial photographs. In the case of road map data using satellite photographs or aerial photographs, a road map is created by changing the viewpoint altitude or the angle with the ground (look angle) when looking down from the viewpoint in the screen control management unit 13 described later. Thus, a road map can be displayed in two dimensions and three dimensions. However, since this image pattern data has a large amount of data, only the road map data covering a part of the area such as the downtown area and the urban area is stored in the map data storage section 3.

  The switch information input unit 4 includes, for example, a mechanical switch installed around the display unit 6 and a touch switch integrated with the display unit 6 and is used for various inputs. For example, the switch information input unit 4 includes various switches such as a detailed switch for refining a map displayed on the display unit 6, a wide area switch for widening the map, and a three-dimensional switch for displaying a three-dimensional map.

  The memory unit 5 is composed of, for example, a ROM or a RAM, and an execution program for operating the navigation device 1 is stored in the ROM, and the RAM is a map acquired from temporary data or a map data storage unit when the program is executed. Data etc. are temporarily stored. This program can also be acquired from the outside via the memory unit 5.

  The display unit 6 is composed of, for example, a liquid crystal display. On the screen of the display unit 6, a road map around the current position and the own vehicle mark M are displayed based on the current position of the vehicle detected by the position detection unit 2 and the map data input from the map data storage unit 3. Is displayed. The screen of the display unit 6 includes a designation screen for designating a destination, a road map around the designated destination, and a setting screen for setting various functions of the navigation device 1 on / off. Is displayed. The audio output unit 7 includes a speaker and outputs audio for guidance and audio for explaining the operation of the navigation device 1.

  The control circuit 8 is configured as a normal computer and executes predetermined arithmetic processing according to a program stored in the memory unit 5. In FIG. 1, main functions executed by the control circuit 8 are displayed as a functional block diagram. That is, the control circuit 8 includes a map data acquisition unit 9, a route calculation unit 10, a route guidance unit 11, a drawing unit 12, and a screen control management unit 13.

  The map data acquisition unit 9 acquires necessary map data from the map data storage unit 3 and gives it to each unit. For example, normally, map data including the current position detected by the position detection unit 2 is acquired from the map data storage unit 3 and given to the screen control management unit 13. The screen control management unit 13 instructs the drawing unit 12 to display the road map around the current position on the display unit 6 together with the host vehicle mark M indicating the current position.

  When the destination is input by the switch information input unit 4, the route calculation unit 10 creates an optimal route from the current position to the destination based on the map data given from the map data acquisition unit 9. That is, the map data acquisition unit 9 acquires map data from the current position to the destination from the map data storage unit 3, and the route calculation unit 10 applies a technique such as a known Dijkstra method to the map data. To create an optimal route.

  The created optimum route is given to the route guide unit 11. The route guidance unit 11 instructs the screen control management unit 13 to identify and display a road corresponding to the created optimum route in a specific color in the road map displayed on the display unit 6. Further, the route guidance unit 11 calculates a guidance point such as an intersection where a right or left turn should be performed, and outputs a voice signal to the voice output unit 7 so as to notify the guidance point by voice. In addition, the route guidance unit 11 gives information on the guidance point to the screen control management unit 13, and the screen control management unit 13 displays a magnified view near the intersection and a schematic diagram of the expressway on the display unit 6. 12 is instructed.

  Here, the operation of display processing by the navigation device (map display device) 1 will be described. FIG. 2 is a flowchart showing display processing according to the embodiment of the present invention. FIG. 3A is an image diagram showing a display example of the display unit 6 according to the embodiment of the present invention, and FIG. 3B shows another display example of the display unit 6 according to the embodiment of the present invention. It is an image figure, (c) is an image figure which shows another example of a display of the display part 6 concerning embodiment of this invention. FIG. 4 is an image diagram showing the viewpoint height and depression angle according to the embodiment of the present invention.

  First, in step S1, the current position is specified. The current position is identified by using the position information of the vehicle detected by the position detection unit 2 and the road shape data of the map data acquired from the map data acquisition unit 9 on which road the current position of the vehicle exists. Identify. When the current position is specified, the process proceeds to step S2.

  In step S2, it is determined whether or not a destination has been set. This determination is performed by determining in the route calculation unit 10 whether or not the destination is input by the switch information input unit 4. If the destination is set, the process proceeds to step S3. If the destination is not set, the process proceeds to step S5.

  In step S3, a route from the current location to the destination is set. In the route setting, the route calculation unit 10 calculates the optimum route from the current position to the destination using the map data given from the map data acquisition unit 9. When the route is set, the process proceeds to step S4.

  In step S4, route guidance processing is performed. The route guidance process is performed by the route guidance unit 11. As described above, a voice signal is input to the voice output unit 7 for the guidance point on the route, or information on the guidance point is given to the screen control management unit 13. When the route guidance process is performed, the process proceeds to step S5.

  In step S5, it is determined whether or not the map display is a three-dimensional display. This determination is performed by determining whether or not the three-dimensional switch of the switch information input unit 4 is operated by the screen control management unit 13. If the three-dimensional switch has been operated, the process proceeds to step S7. If the three-dimensional switch has not been operated, the process proceeds to step S6. In step S6, a two-dimensional map display process is performed. In the processing of 2D map display, a 2D map is displayed on the display unit 6 by the drawing unit 12 or the like, and a guidance point is notified by voice using the voice output unit 7 by the route guidance unit 11 or in the vicinity of an intersection. This is done by causing the display unit 6 to display the enlarged view.

  In step S7, a three-dimensional map is displayed on the display unit 6. For the display of the 3D map, first, the screen control management unit 13 has information for drawing the 3D map such as the viewpoint height h and depression angle Θ (hereinafter also referred to as viewpoint information) as shown in FIG. Input to the drawing unit 12. Then, the drawing unit 12 draws a three-dimensional map and a guide route near the current position in a bird's eye view display format based on the information acquired from the screen control management unit 13. Further, the drawing unit 12 displays the drawn three-dimensional map on the display unit 6. When the destination is not set, only the three-dimensional map near the current position is displayed on the display unit 6. When the three-dimensional map is displayed on the display unit 6, the process proceeds to step S8. Note that the viewpoint information corresponds to the detail / wide area switch operation and can be changed in multiple stages (for example, 3 stages to the detail / wide area side), but if there is no detail / wide area switch operation, it is the default. A value is input to the drawing unit 12.

  In step S8, the display scale or viewpoint information is displayed on the display unit 6. The display scale or viewpoint information is displayed on the display unit 6 by the drawing unit 12 corresponding to the viewpoint information or viewpoint information of the three-dimensional map displayed on the display unit 6. When the display scale or the viewpoint information is displayed on the display unit 6, the process proceeds to step S9. Note that the display of the display scale and the viewpoint information can be configured to be selected or switched by a switch operation.

  Here, the display scale is a lower side distance L1, an upper side distance L2, and a depth distance L3 of the three-dimensional map displayed on the display unit 6 as shown in FIG. This display scale is determined by the viewpoint information, and may be stored in a storage unit (not shown) in association with the viewpoint information. It should be noted that the lower side distance L1, the upper side distance L2, and the depth distance L3 shown together with the arrows in FIG. 3A are described for explanation and are not displayed on the actual display unit 6.

  As for the display form of the display scale, as shown in FIG. 3A, the display area A is displayed with numbers (L1 = 200 m, L2 = 400 m, L3 = 300 m), or FIG. As shown in the figure, the display area A is displayed with a figure such as a polygon and a number. With respect to the display mode of the viewpoint information, as shown in FIG. 3C, the display area A is displayed with a figure with a scale and numerals (h = 500 m, Θ = 60 °). Although not shown, the viewpoint information display form may be displayed only with numbers. The display area A that is the display position of the display scale or the viewpoint information on the display unit 6 does not reduce the visibility of the three-dimensional map displayed on the display unit 6, so that FIGS. A corner as shown in FIG.

  In step S9, the presence / absence of detailed / wide area switch operation is determined. The presence / absence of the detail / wide area switch operation is determined by determining whether the detail / wide area switch of the switch information input section 4 is operated or not by the screen control management section 13. If there is an operation, the process proceeds to step S10, and if there is no operation, the process returns to step S1.

  In step S10, the screen control management unit 13 determines whether the operated switch is a detail switch operation. If the switch is a detail switch, the process proceeds to step S11. If the switch is a wide area switch, the process proceeds to step S13. .

  In step S11, a detailed three-dimensional map is displayed on the display unit 6. The details of the three-dimensional map are obtained by three-dimensional information such as viewpoint information corresponding to the detail switch input to the screen control management unit 13 (when the detail switch is operated, the viewpoint height h decreases and the depression angle Θ decreases). Information for drawing a map is input to the drawing unit 12. The drawing unit 12 draws a detailed three-dimensional map in the bird's eye view display format based on the information acquired from the screen control management unit 13. Further, the drawing unit 12 displays the drawn three-dimensional map on the display unit 6. If a detailed three-dimensional map is displayed on the display part 6, it will progress to step S12. In step S <b> 12, the detailed display scale or viewpoint information of the three-dimensional map is displayed on the display unit 6 by the drawing unit 12.

  In step S <b> 13, a wide area three-dimensional map is displayed on the display unit 6. The widening of the 3D map is based on the 3D viewpoint information corresponding to the wide area switch input to the screen control management unit 13 (when the wide area switch is operated, the height h of the viewpoint increases and the depression angle Θ increases). Information for drawing a map is input to the drawing unit 12. Then, the drawing unit 12 draws a wide-area three-dimensional map in the bird's eye view display format based on the information acquired from the screen control management unit 13. Further, the drawing unit 12 displays the drawn three-dimensional map on the display unit 6. When a wide-area three-dimensional map is displayed on the display unit 6, the process proceeds to step S14. In step S <b> 14, the display unit 6 displays the display scale or viewpoint information of the broadened three-dimensional map in the drawing unit 12.

  In this way, when a 3D map is displayed on the display unit 6, the lower side distance L1, the upper side distance L2, the depth distance L3 (display scale), the viewpoint height h, and the depression angle of the displayed 3D map are displayed. Since Θ (viewpoint information) is displayed on the display unit 6, the actual distance of the displayed three-dimensional map can be known, and the sense of distance can be grasped intuitively.

  Further, since the display scale and the viewpoint information are displayed at the corner (display area A) of the display unit 6, the display scale and the like can be grasped without deteriorating the visibility of the three-dimensional map. Furthermore, the visibility can be improved by displaying the display scale and the viewpoint information with numbers or / and figures.

1 is a block diagram showing a schematic configuration of a navigation device (map display device) 1 according to an embodiment of the present invention. It is a flowchart which shows the display process concerning embodiment of this invention. (A) is an image figure which shows the example of a display of the display part 6 concerning embodiment of this invention, (b) is an image figure which shows another example of a display of the display part 6 concerning embodiment of this invention. (C) is an image figure which shows another example of a display of the display part 6 concerning embodiment of this invention. It is an image figure which shows the height and depression angle of a viewpoint concerning embodiment of this invention. It is an image figure which shows the example of a display of a display part concerning a prior art.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Navigation apparatus (map display apparatus) 2 Position detection part 3 Map data storage part 4 Switch information input part 5 Memory part 6 Display part 7 Voice output part 8 Control part 9 Map data acquisition part 10 Route calculation unit, 11 Route guidance unit, 12 Drawing unit, 13 Screen control management unit

Claims (3)

A display unit for displaying a three-dimensional map;
Map data storage means for storing map data for displaying the three-dimensional map;
A 3D map in a desired range is displayed on the display unit using the map data, and the depth distance of the 3D map and the distances of the 3D map on the lower side and the upper side of the display unit are included. Drawing means for displaying a display scale on the display unit;
A map display device comprising: The map display device according to claim 1, wherein the display scale is displayed at a corner of the display unit. The map display device according to claim 1, wherein the display scale is displayed by numbers , or numbers and figures.

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