JP2009162484A - Map display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a "map display device" which settles uneasiness of a user caused by that a guide path is displayed on a map screen whereon a polygon road map is not present, and thus can enhance the reliability of a navigation system. <P>SOLUTION: Line map data which expresses roads with lines, polygon map data which includes the polygon road map expressing the roads with planes, and line map-polygon map link data which shows linkage of a line map with the polygon road map, are imported, and it is discriminated from the line map-polygon road map link data whether or not the polygon road map is present in a map of a guide path portion to be displayed on the map screen. At the time when it is made clear by the discrimination that the polygon road map is not present in the map of the portion of display of the guide path in the map to be displayed, a reduced scale of map display is changed to that of wide-area display, that is, to a reduced-scale region wherein the line map is to be displayed, so that the guide path can be displayed on the line map. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a map display device mainly used for a navigation device, and in particular, when traveling along a guide route in an area where there is no polygon road map data, the guide route is not displayed on a polygon image on which no road is displayed. The present invention relates to a map display device.

  In the navigation device, a map / information data storage medium such as a CD-ROM, a DVD-ROM, a hard disk or the like on which map data for drawing a map and facility information data for searching a facility are recorded, and the map / information A data capture device that captures data from a data storage medium, a display device that displays a map, etc., and a self-contained navigation device that uses a GPS receiver, a mileage sensor, a gyroscope, etc. The vehicle position detection device for detecting the vehicle position is fetched from the map / information data storage medium and the map image around the vehicle position is drawn on the screen of the display device based on the map data. At the same time, the vehicle position mark is displayed superimposed on the display screen, and the map image is scanned as the vehicle moves. Roll display, or moving the fixed vehicle position mark a map image on a screen, so that seen whether the vehicle is traveling where the current at a glance.

  Map data stored in a map / information data storage medium such as a CD-ROM, DVD-ROM, or hard disk is divided into longitude and latitude widths of appropriate sizes according to various scale levels. A road or the like is stored as a coordinate set of nodes expressed by longitude and latitude. The road data for displaying the line map is composed of two or more nodes connected to each other. The map data includes road layers including a road list, a node table, an intersection configuration node list, etc., and roads, buildings, and facilities on the map screen. Map data such as background layers for displaying parks, rivers, etc., and information data for displaying letters, map symbols, etc., such as administrative division names such as city names, road names, intersection names, and facility names Etc.

  Similarly to the background layer, the plane data is recorded as polygon data and stored in association with the map data. In particular, roads have road polygon data that can be displayed at a predetermined scale or larger, and this road polygon data is almost complete in Japan, but there are countries that have not yet been developed in developing countries. Many.

  In addition, this navigation device has a route guidance function for allowing a user to easily travel on a road toward a desired destination or waypoint (hereinafter referred to as “destination”) without making a mistake. Yes. According to this route guidance function, a destination is set by various means as will be described later, and an appropriate route is calculated from various points in the route connecting these points from the departure point to the destination. It comes to present. Also, the route selected by the user is stored as a guide route, and while driving, the guide route is drawn on the map image with a different color from other routes and displayed on the screen. When approaching an intersection where the course of course should be changed within a certain distance, the intersection is enlarged and displayed on the screen by drawing an arrow indicating the direction in which the course should be changed, or a right or left turn is guided by voice. In this way, the user can be guided to the destination.

Patent Document 1 discloses a technique for smoothly scrolling a series of map display data along an optimum route from a starting point to a destination when the driver gives an instruction.
JP-A-8-190835

  In the navigation device as described above, when the destination is set as described above, the guidance route is calculated and displayed on the map screen, the road displayed on the map is a road based on line data formed by connecting nodes. A map is displayed, and a guidance route is displayed on the map. Further, when displaying a map of a predetermined scale or larger that can express the width of the road, a map using the road polygon data as described above is displayed, and a guidance route is displayed on the road.

  Therefore, when traveling in an area where road polygon data is maintained, for example, as shown in FIG. 5A, a road polygon P2 is displayed together with a polygon P1 of buildings and ponds, and the road displayed by the road polygon data is displayed. A guide route U is displayed on the screen. When trying to display a wide-area map with a scale larger than this map, the road map displayed with the road polygon data is displayed in the illustrated example as shown in FIG. When displaying a large wide area map, as shown in FIG. 5C, the road based on the road polygon data indicating the road width is not displayed, and a map composed of connected nodes is displayed. When displaying a large-scale wide-area map, a map that omits narrow roads is displayed as appropriate.

  However, in current map data of developing countries, for example, polygon data such as buildings and ponds are relatively complete, but road polygon data indicating road borders is not necessarily maintained. Therefore, for example, as in the polygon map screen of FIG. 6 showing the same area as in FIG. 5A, buildings and the like are displayed by the polygon P1, but no road is displayed. Conventionally, the guidance route U is displayed on a map screen on which no road is displayed as shown in the figure. In particular, a user who does not know such a situation becomes uneasy about whether there is a road, and the reliability of the navigation device There was a problem of impairing sex.

  Therefore, the present invention relates to a map display device that prevents a guide route from being displayed on a map screen having no polygon road map data, eliminates user anxiety, and increases the reliability of the navigation device.

  In order to solve the above problems, the map display device according to the present invention combines line map data representing roads with lines, polygon map data including polygon road maps representing roads with planes, and line maps and polygon road maps. The map data capturing unit captures the map data capturing unit that captures the polygon map link data indicating the line map, and whether or not the polygon road map exists in the map of the guide route portion displayed on the map screen. When it is determined that there is no polygon road map in the guide route display portion of the map to be displayed by the guide route map polygon road data presence / absence determination unit and the guide route map polygon road data presence / absence determination unit determined from the data A line map forced display unit for displaying a line map is provided.

  Another map display device according to the present invention is characterized in that, in the map display device, the determination processing in the on-guidance route map polygon road data presence / absence determination unit is determined based on line map polygon road map link data. .

  Further, in another map display device according to the present invention, in the map display device, the line map forced display unit displays a line map by increasing a scale of the map to be displayed and displaying a wide area map. Features.

  Another map display device according to the present invention is characterized in that, in the map display device, the line map forced display unit displays a line map of a virtual road by a line parallel to the guidance route.

  The map display device according to the present invention is characterized in that, in the map display device, the determination process in the on-guide route map polygon road data presence / absence determining unit is continuously performed during movement along the guide route. And

  Further, in the map display device according to the present invention, in the map display device, the determination process in the map polygon road data presence / absence determination unit on the guidance route is all performed when the guidance route is set, and the determination result data is obtained. The data is stored, and the data is read and used during movement along the guidance route.

  Since the present invention is configured as described above, the guidance route is displayed on the map screen on which the polygon road data is not drawn in a state where the polygon road map is displayed, thereby preventing the user from becoming uneasy. The map display device can increase the reliability of the navigation device.

  The present invention aims to prevent a guide route from being displayed on a map screen on which polygon road data is not drawn. Line map data representing roads as lines and polygon road maps representing roads as planes are used. Polygon road map exists in the map data import part that captures the polygon map data including the line map polygon map link data indicating the combination of the line map and the polygon road map, and the guide route portion map displayed on the map screen Whether or not to determine whether the map is to be displayed by the map polygon road data presence / absence determination unit on the guidance route and the map polygon road data presence / absence determination unit on the guidance route, This is realized by providing a line map forced display section that displays a line map when it is determined that there is no polygon road map in the guidance route display part. .

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a functional block diagram of a navigation device mainly showing a map display processing unit 31 as a map display device according to the present invention. In the navigation device shown in FIG. 1, in order to perform the same function as that of a normal navigation device, a ROM storing software for comprehensively performing various predetermined functions in the system control unit 10, and processing the software The CPU and RAM are provided to control each functional unit connected thereto.

  In the illustrated navigation apparatus, a vehicle position detection unit 13 is connected to the system control unit 10 and the position data of the GPS receiver 11 is input. By inputting the movement data of the vehicle from the azimuth detecting unit 12, the current position of the vehicle is accurately detected. Further, the system control unit 10 is connected to an instruction signal input unit 16 and is provided with a voice recognition unit 15 for inputting a signal from the remote controller 14 and recognizing the user's instruction voice as in the prior art. Is also typing. The scale of the map instructed by the user is also output from the instruction signal input unit 16 to the display map scale instruction capturing unit 37 of the map display processing unit 31 described later.

  Further, a data fetching unit 18 is connected to the system control unit 10, and necessary map data, facility information, etc. are fetched from a map / information data recording medium 17 such as a CD-ROM, DVD-ROM, or hard disk. If the data recording medium can easily write data, such as a hard disk, the data can be read and used after reading from outside or data processed by other functional units. It is also possible to input to a recording medium. Therefore, the map / information data recording medium 17 records data related to diagram data obtained by connecting nodes as map data, and also records polygon map data. The polygon map data includes a map in which road polygon data recorded as polygon data also exists for a road and a map that does not exist.

  The guide route calculation unit 19 captures the current location of the vehicle detected by the vehicle position detection unit 13, captures a separately set waypoint and final destination, and performs various types such as the shortest required time, the shortest distance, and general road priority. Calculate and present the optimum guidance route under the conditions. The guide route guide unit 20 stores the guide route finally selected by the user for the guide route calculated as described above, and safely and definitely from the current position to the final destination. Guidance is provided by voice and screen so that the vehicle can run. This guide route is captured by a guide route capturing unit 39 of the map display processing unit 31 described later.

  The voice output unit 21 outputs voice guidance output from the guidance route guide unit 20 from the speaker 22 and further outputs various voices as necessary. The image display unit 23 displays various images to be output on the monitor 24. In addition to a map centered on the current location, the guidance route output from the guidance route guide unit 20, and an enlarged view of the intersection, a touch panel is provided on the monitor 24. When equipped, various displays such as a display for a user to input an instruction by touching the monitor are performed.

  The map display processing unit 31 that performs map display according to the present invention is connected to the system control unit 10 and operates in association with the above-described units. In the illustrated example, the vehicle position detection unit 32 detects the vehicle position. The current position detected by the unit 13 is captured, and the map data capturing unit 33 captures a map around the current position. Further, in the illustrated example, the guide route calculated by the guide route calculation unit 19 acquired by the guide route acquisition unit 39 is also acquired, and map data along this guide route is acquired separately from the current position. It is also possible.

  In the map data fetching unit 33, especially for the road map data 34, line map data 35 created by connecting nodes, and polygon road map data 37 shown as plane data that can also display the road width as polygon data. The line map data 35 and the polygon road map data 37 are each provided with attribute data as various data related to the road for each individual road. As one of the attribute data, for example, For the line map data 35, data linked to the polygon road map is provided as line map / polygon road map link data 36, and similarly, the polygon road map data 37 is provided with attribute data as various data related to each polygon road. As one of the attribute data, the data linked to the line map is It is provided as a map polygon road map link data 36. By this line map / polygon road map link data 36, roads are associated with each other, and a guide route based on the line map data can be displayed separately even when the polygon road map is displayed.

  In addition to recording such line map / polygon road map link data 36 as attribute data of each map data, the line map data is prepared as link data separately from these data, and only by preparing the link data. And a polygon road map data link may be prepared. In the present invention, such link data makes it possible to easily detect the presence or absence of polygon road map data corresponding to a line map, and to easily switch the display of these.

  In the example shown in FIG. 1, the monitor display map range detection part 40 is provided, and the range of the map displayed on the monitor 24 which displays a map is detected. At the time of detection, the map range displayed on the monitor 24 is displayed based on the display map scale captured by the display map scale instruction capturing unit 35 for the map displayed around the current position captured by the current position capturing unit 32. To detect. In the guide route display detection unit 41 in the monitor display map area, with respect to the guide route taken in by the guide route taking unit 39, which range is the guide route in the range of the map displayed on the monitor detected by the monitor display map range detection unit 40 To detect.

  The on-route map polygon road data presence / absence discriminating unit 42 uses data indicating the portion of the guided route in the range of the map to be displayed on the monitor, which is detected by the on-monitor map area guide route display detecting unit 41. Thus, it is determined whether or not the polygon road data 37 exists in this portion of the road map data 35 taken in by the map data fetching unit 33. The determination can be easily made by searching the line map / polygon road map link data 36 portion. The line map / polygon road map link data 36 is recorded on the map / information data recording medium as attribute data of the line map data 34, as attribute data of the polygon road map data 37, or as data separate from these. deep.

  In the forced line map display section 42, the on-route map polygon road data presence / absence determination section 40 displays the polygon road data on the map of the portion of the map that is currently displayed on the monitor or where the guide path is displayed. The map to be displayed on the monitor is forcibly displayed as a line map when it is determined that the map does not exist. In particular, the display map scale changing unit 44 increases the scale of the display map to display a wide area map. Thus, the scale is set such that the polygon road map is not originally displayed, and thereby the line map is displayed. In addition to displaying a line map with such a reduced scale, a line that displays a virtual road as a line along the guidance route even when a detailed map with a relatively small scale is currently displayed. A map display may be performed.

  The map display unit 45 displays a map on the monitor 25 based on the processing performed by each processing function unit as described above. In the illustrated example, the current position of the vehicle captured by the current position capturing unit 32 is displayed. Read the map data in the appropriate range captured by the map data capture unit 33 based on the position, the display map scale captured by the user or the navigation device, which is initially set by the position, the display map reduction instruction capture unit 38, The map of the range detected by the monitor display map range detection unit 40 is output to the monitor, and the guidance route captured by the guidance route capture unit 39 is displayed on the map.

  When such a map display is performed, polygon map data is read and displayed on a detailed map having a scale smaller than a predetermined scale, and a line map is displayed on a wide area map larger than the scale. Further, during normal driving, a polygon map that can also indicate the width of the road is displayed. However, if the line map compulsory display unit 43 detects that there is no polygon road data in the portion of the map that displays the guidance route in the currently displayed map, the map display unit increases the scale to display a wide area map, etc. To forcibly display a line map.

  In the present invention composed of the functional blocks as described above, for example, the present invention can be carried out in order according to the operation flow shown in FIG. In the map display process shown in FIG. 2, the calculation and setting of the guide route is first performed (step S1), and then the current position is captured (step S2). Next, a map around the current location and a guidance route are displayed (step S3). After that, it is determined whether or not the current polygon map is being displayed (step S4). If it is determined that the polygon map is not being displayed, the process returns to step S2 to capture the current position and the above operation is repeated.

  When it is determined in step S4 that the polygon road map is currently being displayed, the scale of the currently displayed map is read (step S5). Thereafter, in consideration of the scale of the map, the screen display map area is detected (step S6), and it is determined whether or not there is a polygonal road map on the map on the guide route of the screen display map area (step S7). . In this determination, when a plurality of currently displayed polygon map data are combined to display one map, and there is no polygon road map on any individual map for which a guide route is set, Here, it is determined that there is no polygon road map in the map on the guide route in the screen display map area. If it is determined that there is a polygon road map in this determination, map display using the currently displayed road polygon is continued in step S9.

  In step S7, when it is determined that there is a portion that does not have a polygon road map in the map on the guidance route in the screen display map area, in step S8, the map is enlarged to display a wide area map. Change to the displayed scale and display the line map. Thereafter, at the same time as the processing in step S9, it is determined whether or not the vehicle has arrived at the destination in step S10. If it is determined that the destination has not yet been reached, the process returns to step S2 and the above operation is repeated. If it is determined in step S10 that the vehicle has arrived at the destination, this process is terminated (step S11). In addition, when the line map is forcibly displayed as described above, for example, a display such as “The road becomes unclear if the detailed map is displayed any more is displayed”, and the user is forced from the line map display state. Attention may be paid to trying to display a detailed map at a reduced scale.

  In the example of the operation flow of FIG. 2, the example in which the process of detecting that the polygon road data does not exist in the map displayed on the screen is performed while running is shown. For example, as shown in FIG. You may make it perform all when setting. That is, in the example of the map display process shown in FIG. 3, the calculation and setting of the guidance route is first performed (step S21), and then it is immediately determined whether or not the vehicle travels on a road without a polygon road map (step S22). .

  This determination is performed by searching all map portions where no polygon road map exists in the map portion where the guide route is set when the guide route is set. When it is determined in this step S22 that the set guidance route does not travel on the map portion without the polygon road map, the process proceeds to step S33 to display the polygon road map to the destination, and the process ends in step S34. To do. It should be noted that even if all polygon road map displays are set in step S33, various displays can be arbitrarily performed according to user instructions. If the guidance route is set and it is determined that all the polygonal road maps exist on the guidance route by performing the processing as described above, the same map display as before is performed without performing any special processing thereafter. Processing is done.

  When it is determined in step S22 that the vehicle travels on a road without a polygon road map, the travel map portion of the road without a road polygon is stored (step S23). Thereafter, almost the same processing as in the example of FIG. 2 is performed except for some differences. In step S24, the current position is fetched, and then the current location map and the guidance route are displayed (step S25). It is determined whether or not it is being displayed (step S26). When it is determined that the polygon map is not displayed, the process returns to step S24 and the above operation is repeated, and when it is determined that the polygon map is currently displayed, it is displayed now. The scale of the current map is read (step S28).

  Thereafter, the screen display map area is detected (step S28), and it is determined whether or not there is a polygonal road map on the map on the guidance route of the screen display map area (step S29). As a result of the determination, when it is determined that there is a polygon road map in the map on the guidance route in the screen display map area, in step S32, a process of continuing the map display using the currently displayed road polygon is performed. If it is determined in step S29 that there is no portion of the polygon road map, the map is displayed with the scale changed to the line map display (step S30). Thereafter, it is determined whether or not the vehicle has arrived at the destination (step S31). If the vehicle has not yet arrived at the destination, the flow returns to step S34 to repeat the above operation, and when it is determined that the vehicle has arrived at the destination, the processing is terminated. (Step S34) is the same as in the example of FIG.

  In the present invention, as a result of the operation as described above, when traveling along a guide route in an area where a polygon road map is not prepared, conventionally, the nature of buildings, ponds, etc. is shown by polygons as shown in FIG. In this case, there is a problem that the guide route is shown in the portion where the road is not shown, and the user becomes anxious. However, according to the present invention, as shown in FIG. Without displaying the map screen as shown in (a), by displaying the wide area with the scale up to the scale for displaying the line map as shown in (b), there is no road as described above. There is no need to display a screen that travels through the part.

  In the above-described embodiment, the road is changed to a scale represented by a diagram so as not to give anxiety as if driving in a place without a road when driving in an area without a polygon road map. In addition, as shown in FIG. 4C, for example, when a road is not displayed on the screen by running in an area where there is a guide route polygon map but there is no polygon road map, it is parallel to the guide route U. A line of a virtual road R having a predetermined width is displayed on both sides of the line, and it is originally indicated that there is a road at this part by a broken line or the like, or as if a road is at this part by a solid line. Also good. When performing such a process of displaying a virtual line map, a guide route partial virtual road display unit is used instead of the line map forced display unit 43 of FIG. 1, and in the operation flow of FIG. Then, in step S30, it can be carried out by performing a process of displaying a virtual line map composed of lines having a predetermined width across the guide route.

It is the functional block diagram which mainly showed the map display process part in the Example which applied the map display apparatus by this invention to the navigation apparatus. It is an operation | movement flowchart of the map display process in the Example. It is another operation | movement flowchart of the map display process in the Example. The example of a map display by this invention is shown, (a) shows the conventional comparative example, (b) shows the example of a display of this invention, (c) is a figure which shows the other example of a display. It is a figure which shows the relationship between the scale change in the map display in which the conventional polygon road map is maintained, and a display map. It is a figure which shows the state which displayed the guidance route in the map in which the conventional polygon road map is not maintained.

Explanation of symbols

31 Map display processor
32 Current position capturing unit 33 Map data capturing unit 34 Road data 35 Line map data 36 Line map / polygon road map link data 37 Polygon road map data 38 Display map scale instruction capturing unit 39 Guide route capturing unit 40 Monitor display Map range detector 41 Monitor display map area guide route display detector 42 Guide route map polygon road data presence / absence determiner 43 Line map forced display unit 44 Display map scale change unit 45 Map display unit

Claims (6)

Map data capture unit that captures line map data representing roads as lines, polygon map data including polygon road maps representing roads as planes, and line map polygon map link data indicating the combination of line maps and polygon road maps When,
A guidance route on-map polygon road data presence / absence discriminating unit for discriminating whether or not a polygon road map exists in the map of the guidance route part to be displayed on the map screen;
A map map compulsory display unit for displaying a line map when it is determined that the polygon road map does not exist in the guide route display portion of the map to be displayed by the map polygon road data presence / absence determination unit on the guide route; A featured map display device.   2. The map display device according to claim 1, wherein the determination processing in the on-guidance route map polygon road data presence / absence determination unit is determined based on line map polygon road map link data.   The map display device according to claim 1, wherein the line map forced display unit displays a line map by increasing a scale of a map to be displayed and displaying a wide area map.   The map display device according to claim 1, wherein the line map forced display unit displays a line map of a virtual road with a line parallel to the guidance route.   The map display device according to claim 1, wherein the determination processing in the on-guidance route map polygon road data presence / absence determination unit is continuously performed during movement along the guidance route.   The discrimination process in the on-guidance route map polygon road data presence / absence discriminating unit is performed all when a guidance route is set, and data of the discrimination result is stored, and the data is read and used during movement along the guidance route. The map display device according to claim 1.

Images