JP5097329B2 - In-vehicle information terminal, summary map creation device, summary map display method - Google Patents

Description

  The present invention relates to a method and apparatus for simplifying and displaying a map based on map data.

  The apparatus disclosed in Patent Document 1 performs processing such as straightening and orthogonalization on the road shape in the map data, and further displays only landmark information within the range defined by the mask. Simplify the map. By displaying the simplified map in this way, an easy-to-read map is provided.

JP-A-11-202762

  When the device disclosed in Patent Document 1 is applied to a car navigation device and a simplified map is displayed to guide a vehicle to a destination, the road shape is simplified, so that a dead-end road is known. There is a problem that it is difficult.

The in-vehicle information terminal according to the invention of claim 1 is a summarization target road determining means for determining a preset recommended route and a road selected according to a road type from roads intersecting the recommended route as a summarization target road. Summarizing target roads determined by the summarizing target road determining means based on the road data included in the map data and creating a summary map; and roads other than the recommended route among the summarizing target roads Is a determination means for determining whether or not the road is dead-end, and sequentially confirms the links connected to the recommended route from the intersection with the recommended route for the road data used in the summary of the road, and before the number of links reaches a predetermined value If the link is interrupted and determines that dead-end road is blind to the road, otherwise determining means and the connecting road is not a dead end for the road , When displaying on the display means a summary map, are those comprising a display control means for displaying in different display forms a dead-end road and connecting road.
The in-vehicle information terminal according to the invention of claim 2 is a summarization target road determining means for determining a preset recommended route and a road selected according to a road type among roads intersecting the recommended route as a summarization target road. Summarizing target roads determined by the summarizing target road determining means based on the road data included in the map data and creating a summary map; and roads other than the recommended route among the summarizing target roads Is a determination means for determining whether or not the road is dead end, and for the road data used for the summary of the road, links that are connected to the recommended route from the intersection are sequentially confirmed, and the distance from the intersection reaches a predetermined value. If the link is interrupted before, the road is determined as a dead end road, otherwise the road is determined as a connected road that is not a dead end. A constant section, when displaying on the display means a summary map, are those comprising a display control means for displaying in different display forms a dead-end road and connecting road.
According to a third aspect of the present invention, in the in-vehicle information terminal according to the first or second aspect , the display control means displays the dead end road in a uniform display color and displays the connected road in a gradation color.
According to a fourth aspect of the present invention, in the in-vehicle information terminal of the first or second aspect , the display control means displays the dead end road with a specific display.
The summary map creation device according to the invention of claim 5 determines a summary target road for determining, as a summary target road, a preset recommended route and a road selected according to a road type among roads intersecting the recommended route. A summary map creation means for summarizing the summary target road determined by the summary target road determination means based on the road data included in the map data, and creating a summary map ; A determination means for determining whether or not a road is dead end, the road data used for summarizing the road is sequentially checked for links linked to the recommended route and before the number of links reaches a predetermined value. in the case where the link is interrupted and determines that dead-end road is blind to the road, otherwise determining determines that connecting road is not a dead end for the road And the step, in abridged map, and display change means for representing in different display forms a dead-end road and connecting roads, signal outputs a summary map and connected to the dead end road road represented in different display form by display changing means to the outside And a summary map output means.
The summary map creation device according to the invention of claim 6 determines a summary target road that determines a preset recommended route and a road selected according to a road type from roads intersecting the recommended route as a summary target road. A summary map creation means for summarizing the summary target road determined by the summary target road determination means based on the road data included in the map data, and creating a summary map; A determination means for determining whether or not a road is a dead end, and sequentially confirms a link connected from the intersection with the recommended route to the road data used for the summary of the road, and the distance from the intersection is set to a predetermined value. If the link is broken before reaching the road, the road is determined as a dead-end road, and if not, the road is determined as a connected road that is not a dead-end. A determination means, a display change means for displaying a dead-end road and a connected road in different display forms in the summary map, and a summary map expressed in a display form in which the dead-end road and the connected road are different by the display change means And a summary map output means for outputting.
A summary map display method according to a seventh aspect of the present invention is a summary map display method in a map display device comprising a control circuit and a display means, and a recommended route preset by the control circuit and an intersection with the recommended route. The road selected according to the road type is determined as the road to be summarized, the road to be summarized is summarized based on the road data included in the map data, and a summary map is created. When determining whether or not roads other than the recommended route are dead ends, the road data used for the summary of the road is checked sequentially from the intersection with the recommended route before the number of links reaches the predetermined value. in the case where the link is interrupted and determines that dead-end road is blind to the road, otherwise it determines that connecting road is not a dead end of the road, abridged map When displayed on the display means is for displaying in different display forms a dead-end road and connecting road.
A summary map display method according to an eighth aspect of the present invention is a summary map display method in a map display device comprising a control circuit and display means, and a recommended route preset by the control circuit and an intersection with the recommended route. The road selected according to the road type is determined as the road to be summarized, the road to be summarized is summarized based on the road data included in the map data, and a summary map is created. When determining whether or not a road other than the recommended route is dead end, the road data used for the summary of the road is sequentially checked for the links connecting the intersection with the recommended route, and the distance from the intersection is set to a predetermined value. If the link is broken before reaching the road, the road is determined as a dead end road; otherwise, the road is determined as a connected road that is not a dead end. When displaying about map on the display means is for displaying in different display forms a dead-end road and connecting road.

  According to the present invention, when a summary map is displayed, a dead-end road and a connection road that is not a dead-end are displayed so as to be distinguishable in different display forms. Since it did in this way, in the display of the summary map which simplified the road shape, a dead end road can be displayed in an easy-to-understand manner.

  A configuration of a navigation apparatus according to an embodiment of the present invention is shown in FIG. This navigation device is mounted on a vehicle, and creates and displays a map that summarizes a normal map (hereinafter referred to as a summary map) by simplifying a road shape based on the normal map. . 1 includes a control circuit 11, a ROM 12, a RAM 13, a current location detection device 14, an image memory 15, a display monitor 16, an input device 17, and a disk drive 18. The disc drive 18 is loaded with a DVD-ROM 19 in which map data is recorded.

  The control circuit 11 includes a microprocessor and its peripheral circuits, and performs various processes and controls by executing a control program stored in the ROM 12 using the RAM 13 as a work area. When the control circuit 11 performs a summary map creation process described later, a summary map is created based on the map data recorded on the DVD-ROM 19 and displayed on the display monitor 16. In this summary map, the map display is easy to understand by not displaying roads that are not related to guiding the vehicle to the destination.

  The current location detection device 14 is a device that detects the current location of the host vehicle. For example, a vibration gyro 14a that detects the traveling direction of the host vehicle, a vehicle speed sensor 14b that detects a vehicle speed, and a GPS sensor that detects a GPS signal from a GPS satellite. 14c and the like. The navigation device 1 determines a range for creating a summary map, a route search start point, and the like based on the current location of the host vehicle detected by the current location detection device 14 and displays the current location on the summary map.

  The image memory 15 stores image data to be displayed on the display monitor 16. The image data includes road map drawing data for displaying a summary map, various graphic data, and the like, which are created by a summary map creation process of the control circuit 11. The display monitor 16 displays a summary map on the screen using the image data stored in the image memory 15 and provides it to the user under the control of the control circuit 11. The input device 17 has various input switches for the user to set a destination and a transit point (hereinafter simply referred to as a destination), which is realized by an operation panel, a remote controller, or the like. The user can set a destination by specifying a place name or a position on a map by operating the input device 17 in accordance with a screen instruction displayed on the display monitor 16.

  The disk drive 18 reads map data for creating a summary map from the loaded DVD-ROM 19. This map data includes route calculation data used to calculate the recommended route to the destination, route guidance data used to guide the vehicle to the destination according to the recommended route, such as an intersection name and a road name, It includes road data representing roads, background data representing map shapes other than roads, such as rivers, railways, and various facilities (landmarks) on maps.

  In the road data, the minimum unit representing a road section is called a link, and each road is composed of a plurality of links. A point connecting the links is called a node, and each node has position information (coordinate information). The link shape, that is, the shape of the road is determined by the position information of this node. By executing deformation processing as will be described later on this road data, a summary map is created. Information about the type of road (link type) is set for each link. Although an example using a DVD-ROM is described here, the map data may be read from a recording medium other than the DVD-ROM, such as a CD-ROM or a hard disk.

  When the destination is set by the user as described above, the navigation device 1 uses the current location detected by the current location detection device 14 as a route search start point, and calculates a route to the destination based on the above-described route calculation data. And a predetermined algorithm. The recommended route thus obtained is displayed on the summary map separately from other roads by changing its display form, for example, display color. Thereby, the user can recognize the recommended route on the summary map on the screen. In addition, the navigation device 1 guides the host vehicle by instructing the traveling direction by an image or voice to the user so that the host vehicle can travel according to the recommended route. In this way, the vehicle is guided to the destination.

  A flowchart of the summary map creation process executed in the control circuit 11 is shown in FIG. In step S1, a road for which a summary map is to be created (hereinafter referred to as a summary target road) is determined within a predetermined map range in the map data. Here, the recommended route set as described above and the road intersecting with the recommended route are set as the summary target roads. All roads that intersect the recommended route may be summarized roads, but if roads are complicated, if only roads selected according to the road type are summarized roads, It can be an easy-to-understand summary map.

  In step S2, a summary map is created by executing deformation processing (straightening / orthogonalization processing) on the summary target road determined in step S1. The contents of this deformation process will be described later.

  In step S3, a leveling process is performed on the summary map created by performing the deformation process in step S2. The leveling process refers to turning the entire summary map around the center thereof so that the direction of the route viewed from the current location is directed right above the screen. The leveling process may be performed as necessary and may be omitted. In addition, the direction of the route viewed from the current location does not have to be directed right above the screen. For example, the approach direction to the next guidance intersection may be directed right above the screen.

  In step S4, one of roads other than the recommended route, that is, a road that intersects with the recommended route is selected from all the roads that have been summarized in step S1. In the subsequent processing, one road that intersects with the recommended route is divided into the intersections with the recommended route and handled as separate roads.

  In step S5, it is determined whether the road selected in step S4 is a dead end from the intersection with the recommended route. If it is determined that it is a dead end, the process proceeds to step S6, and the road (hereinafter referred to as a dead end road) is displayed in a uniform color. On the other hand, if it is determined that it is not a dead end, the process proceeds to step S7, and the road (hereinafter referred to as a connected road) is displayed in a gradation color. In this gradation display, it is preferable to make the display color lighter as it goes farther from the recommended route. In this way, it becomes easier to visually understand that the connecting road continues beyond the range displayed on the summary map. After performing Step S6 or S7, the process proceeds to Step S8.

  The determination in step S5 is specifically performed as follows. For the road data used for summarizing the road selected in step S4 (that is, road data representing the original road before the summarization), the links connected to the recommended route from the intersection are sequentially confirmed, and the number of links If the link is broken before reaching the predetermined value, it is determined that the road is a dead end road. On the other hand, if the link is not broken even if the number of links reaches a predetermined value, it is determined that the road is a connection road. In addition, it is good also as determining whether it is a dead end road or a connection road not by the number of links but by whether a link breaks before the distance from an intersection reaches a predetermined value.

  In step S8, it is determined whether all roads other than the recommended route have been selected from the summary target roads in step S4 executed so far. If a road other than all recommended routes has been selected, the process proceeds to step S9. However, if there is a road other than the recommended route that has not yet been selected, the process returns to step S4, and after selecting in step S4, the processes of steps S5 to S7 described above are executed for that road.

  In step S9, the landmark position is corrected with respect to the summary map. The details of the landmark position correction will be described later. In step S10, the landmark whose position has been corrected in step S9 is superimposed on the summary map, and the summary map is displayed on the display monitor 16. In step S11, the vehicle position and the direction of travel destination are displayed on the summary map displayed in step S10. After executing Step S11, the processing flow of FIG. A summary map is created and displayed as described above.

  FIG. 3A is a display example of the summary map created by the summary map creation process described above. In this summary map, a recommended route 30 indicated by a thick line in the drawing and roads 31 to 36 intersecting with the recommended route 30 are displayed. The roads 31 and 32, and 33 and 34 are connected via the intersections 37 and 38 with the recommended route 30, respectively. The roads 35 and 36 are connected to an intersection 39 where the recommended route 30 turns left. A host vehicle position mark 40 and a travel destination direction mark 41 are displayed on the recommended route 30.

  As shown in the figure, the roads 31 and 33 to 36 are displayed in gradation so that the display becomes lighter away from the recommended route, which indicates that the road is a connected road and not a dead end. Yes. On the other hand, the road 32 is uniformly displayed as shown in the figure. Thus, it is indicated that the road 32 is a dead end road and the destination is a dead end.

  Instead of representing the dead-end road and the connecting road by the uniform color display and the gradation color display as described above, a specific display may be attached to one of the roads. For example, for the dead-end road 32, a dead-end mark 42 as shown in FIG. 3B is displayed, and nothing is displayed on other roads that are connected roads. Even in this way, it can be shown on the summary map whether or not it is a dead end. In addition to this, any display method may be used as long as it can display a dead-end road and a connection road.

  Here, the summary map creation method executed in step S2 of FIG. 2 will be described. The summary map is created by executing a process called deformation process on the set map range based on the map data. The contents of the deformation process will be described below.

  FIG. 4 and FIG. 5 are detailed explanatory views for explaining the contents of deformation processing used when creating a summary map in the present invention, respectively. In FIG. 4, road shape straightening (composition point thinning-out processing) will be described as deformation processing (1).

  Assuming that the original figure shown in FIG. 4A is the original road shape, on the other hand, as shown in FIG. 4B, a line connecting both end points (first end point and second end point). The perpendicular distance of each point with respect to (broken line) is measured, and the longest perpendicular distance dmax is obtained. If dmax is equal to or larger than a predetermined value ε set in advance, the corresponding constituent point is left. That is, as shown in (c), a point corresponding to the dmax is added as a new end point (referred to as a third end point), and the first end point and the third end point, and the third end point and the second end point are Draw lines that are connected by broken lines. Note that the points or constituent points here are for determining the shape of the road, that is, the link train, and are nodes or shape interpolation points in the road data (points set between the nodes to determine the link shape). It corresponds to.

  In this way, the same processing is repeated until the longest perpendicular distance dmax becomes smaller than ε. Assume that dmax <ε in the state shown in FIG. At this time, a straight line connecting adjacent end points is drawn, and the road shape is represented by the shape of the straight line. As a result, the road shape as shown in (e) is obtained. In this way, the road shape straightening process is performed.

  In FIG. 5, the orthogonalization of the road shape will be described as the deformation process (2). If the figure shown in FIG. 5A is the original road shape, a straight line passing through the first point (P1) of the first broken line and parallel to the x-axis (the horizontal direction of the map) is obtained. . This straight line is taken as a reference line indicated by a broken line. Next, as shown in (b), for the vector (link) P1P2 connecting the point P1 and the next point P2, the angle θ made with the reference line is obtained.

  Next, as shown in (c), with the vector length fixed, the vector P1P2 is rotated around the starting point P1 so that θ ′ = n · Δθ (n is an integer). Thereby, the end point P2 is moved. The angle Δθ is a unit angle when the vector P1P2 is rotated, and is set to 45 °, for example. By this process, the angle formed by the vector P1P2 and the reference line is corrected in increments of unit angle Δθ.

  Next, as shown in (d), the amount of movement (dx, dy) of the point P2 is sequentially propagated to the next point of the point P2. In the case of an intersection, it is branched and propagated. As a result, the positions of the other points move one after another.

  Thereafter, the same processing as described above is repeated. That is, as shown in (e), a straight line passing through the point P2 and parallel to the x axis is used as a reference line, and an angle θ formed by the next vector P2P3 and the reference line is obtained. Then, as shown in (f), the vector P2P3 is rotated around the start point P2 so that θ ′ = n · Δθ, and the end point P3 is moved. Thereafter, as shown in (g), the amount of movement (dx, dy) that the point P3 has moved is propagated to the next point of P3. In the case of an intersection, it is branched and propagated.

  By sequentially performing such processing on all points, a road shape as shown in (h) is finally obtained. In this way, the road shape is orthogonalized. As described above, the deformation process is completed by performing the straightening and orthogonalizing process of the road shape. By performing this deformation process on the set map range, a summary map can be created.

  On the summary map created as described above, landmarks indicating the positions of various facilities and the like are displayed as in the original map before the deformation process. However, as the road shape is simplified by the deformation process, the position of the road in the summary map changes from the original map. Therefore, if the landmark is displayed on the summary map with the original position, the positional relationship between the road and the landmark cannot be represented correctly. Therefore, it is necessary to correct the position of the landmark after performing the deformation process. The method will be described below.

  In FIG. 6, the outline of the landmark position correction executed in step S9 will be described. As shown in FIG. 6A, the map before the deformation process describes a delicate positional relationship between the position of the landmark and the road. When the deformation process as described above is performed on the original map, and the landmark position is displayed as it is, a summary map as shown in FIG.

  In the summary map shown in (b), only the position of the road is changed with respect to the original map shown in (a), so the positional relationship between the original landmark and the road is not maintained. For example, paying attention to a post office near the center of the map, the post office is located on the opposite side of the road in the original map shown in (a) and the summary map shown in (b). Therefore, in order to correct such inconvenience, the position of the landmark is corrected. As a result, as shown in the summary map shown in (c), the positional relationship between the road and the landmark is the position on the original map. Try to approximate the relationship.

  Next, a detailed algorithm for landmark position correction will be described with reference to FIG. In the landmark position correction, first, as shown in FIG. 7A, a pair list between shape vectors before and after summarization is created. Here, by performing the deformation process as described above at the time of summarization, the number of constituent points of the shape vector representing the shape of the road changes from the original one. Therefore, when creating a pair list, the directionality between the branch points between the shape vectors related in the pair list must match. That is, a one-to-one correspondence relationship is established for each branch point before and after the deformation process.

  After the pair list is created in this way, as shown in (b), correction processing for equalizing the norm of each shape vector and the distance between the corresponding branch points is performed. That is, in the original map before summarization, the norm value of the shape vector closest to the landmark and the ratio of the distance from the landmark to each branch point in the road route including the shape vector are measured. With this measured value, even in the summary map after deformation processing, the norm value and the ratio of the distance from the landmark to the branch point are equivalent to the shape vector associated with the pair list. , Calculate landmark position. Then, a landmark is displayed at the calculated position.

  In the landmark position correction described above, the shape and distance of the road changes by converting a normal map into a summary map by deformation processing, so the corresponding landmarks (shops along the road, etc.) also match the road. The coordinates need to be converted. Therefore, as a parameter for the position of the landmark before conversion, what percentage of the whole landmark is from one end of the road (link) before conversion, which side of the road, from the road Find how many meters away. Then, the converted landmark position is determined using the three parameters for the corresponding road data after conversion. This will be described using a specific example shown in FIG.

FIG. 8A shows an example of a landmark position on a normal map before the deformation process. Roads connecting the points A and B, the link 51 between points A and _{A 1,} point _{A 1} and the link 52 between the _{A 2,} the link 53 between the point _{A 2} and _{A 3,} and the point _{A 3} , B, and a landmark 61 exists along the road. The length of each of the links 51 to 54 is 150 m, 200 m, 350 m, and 500 m, and the road connecting the points A and B constituted by these links has a total length, that is, 1200 m. . The landmark 61 is located 200 m from the point A3 toward the point B, that is, at a point 900 m from the point A, on the left side of the road. The location of the landmark 61 is 10 m away from the road.

  For the landmark position before such deformation processing, the three parameters described above are obtained. The ratio of the first parameter, that is, the distance from one end (point A) of the road to the total distance is obtained as 900/1200 = 0.75 (75%). The second parameter, that is, which side of the road is located, is determined to be on the left side of the road from point A to point B. The third parameter, that is, the distance from the road is obtained as 10 m.

  FIG. 8B shows an example of a landmark position on the summary map after the deformation process is executed. In this summary map, the road connecting the point A and the point B is represented by one link 55, and its length is 1000 m. When the landmark 61 is displayed on this summary map, the converted position is determined using the three parameters obtained previously. That is, the distance from the point A is obtained as 1000 × 0.75 = 750 m using the first parameter. The second parameter and the third parameter determine the position on the left side of the road (link 55) viewed from the point A and 10 m away from the road. By displaying the landmark 61 at a position that satisfies these conditions, the position of the landmark 61 is corrected.

  By performing the processing described above, the position of the landmark is corrected in the summary map, and the positional relationship between the road and the landmark can be approximated to the original map before the summary. As a result, the landmark position in the summary map can be made as shown in FIG. 6C with respect to the landmark position of the original map shown in FIG. A landmark map is created by representing landmark positions on the deformed map.

According to the embodiment described above, the following operational effects can be obtained.
(1) A summary map is created (step S2), it is determined whether or not the road is a dead end (step S5), and the dead end road and the connection road that is not a dead end are displayed in different display forms. (Steps S6 and S7). Since it did in this way, in the display of the summary map which simplified the road shape, a dead end road can be displayed clearly.

(2) The recommended route and the road that intersects with the recommended route are set as summary target roads (step S1), and a summary map is created for these roads. Since it did in this way, when guiding according to a recommended route, only a related road can be displayed as a summary map, and it can be made easy-to-understand map display.

(3) Further, a road intersecting with the recommended route is extracted (step S4), it is determined whether or not the road is a dead end, and the dead end road and the connected road are displayed in different display forms. Since it did in this way, when a user tries to go to the road which crosses out of a recommended route, it can be easily recognized and avoided which road is a dead end.

(4) For roads that intersect the recommended route, check the links that are connected ahead from the intersection with the recommended route, and before the number of links reaches the predetermined value or before the distance from the intersection reaches the predetermined value. When the link is broken, it is determined that the road is a dead end road. Since it did in this way, it can be determined reliably which road is a dead end road.

(5) A dead-end road is displayed in a uniform display color, and a connected road is displayed in a gradation color. Alternatively, the dead end road is displayed with a specific display. Since it did in this way, it can identify easily which road is a dead end road.

  In the above embodiment, an example has been described in which the navigation device reads map data from a storage medium such as a DVD-ROM to create a summary map, but the present invention is not limited to this. For example, the present invention can be applied to a communication navigation apparatus that downloads map data from an information distribution center using wireless communication using a mobile phone or the like. In this case, the summary map creation process as described above may be performed in the information distribution center, and the result may be output as a signal from the information distribution center and distributed to the navigation device. That is, the information distribution center is composed of a device that creates a summary map, displays dead-end roads and connected roads in different display forms in the summary map, and a device that outputs the summary map to the outside.

  In the above embodiment, the summary map creating means is realized by step S2, the road extracting means is step S4, the determining means is step S5, and the display control means is realized by each processing step of step S10. However, the present invention is not limited to the above embodiment. Other embodiments conceivable within the scope of the technical idea of the present invention are also included in the scope of the present invention.

It is a block diagram which shows the structure of the navigation apparatus by one Embodiment of this invention. It is a flowchart of a summary map creation process. It is a display example of a summary map. It is explanatory drawing of the deformation | transformation process (1) utilized when producing a summary map. It is explanatory drawing of a deformation | transformation process (2) similarly. It is explanatory drawing of the outline | summary of the position correction of a landmark. It is explanatory drawing of the detailed algorithm of the position correction of a landmark. It is a figure which shows the specific example of the position correction of a landmark.

Explanation of symbols

1 Navigation device 11 Control circuit 12 ROM
13 RAM
14 current location detection device 15 image memory 16 display monitor 17 input device 18 disk drive 19 DVD-ROM
30 Recommended route 40 Own vehicle position mark 41 Destination direction mark 42 Dead end mark

Claims (8)

A summarizing target road determining means for determining, as a summarizing target road, a preset recommended route and a road selected according to a road type among roads intersecting the recommended route;
Summarizing map creating means for summarizing the summarizing target road determined by the summarizing target road determining means based on the road data included in the map data and creating a summary map;
A determination means for determining whether roads other than the recommended route among the roads to be summarized are dead ends, and the road data used for the summary of the road is a link connected from the intersection with the recommended route first. Judging means for sequentially checking, if the link is broken before the number of links reaches a predetermined value, the road is determined as a dead end road; otherwise, the road is determined as a connection road that is not a dead end ; ,
An in-vehicle information terminal comprising: display control means for displaying the dead-end road and the connection road in different display forms when the summary map is displayed on the display means. A summarizing target road determining means for determining, as a summarizing target road, a preset recommended route and a road selected according to a road type among roads intersecting the recommended route;
Summarizing map creating means for summarizing the summarizing target road determined by the summarizing target road determining means based on the road data included in the map data and creating a summary map;
A determination means for determining whether roads other than the recommended route among the roads to be summarized are dead ends, and the road data used for the summary of the road is a link connected from the intersection with the recommended route first. If the link is broken before the distance from the intersection reaches a predetermined value, the road is determined as a dead end road, and if not, the road is determined as a connected road that is not a dead end. A determination means;
An in-vehicle information terminal comprising: display control means for displaying the dead-end road and the connection road in different display forms when the summary map is displayed on the display means. The in-vehicle information terminal according to claim 1 or 2 ,
The in-vehicle information terminal characterized in that the display control means displays the dead-end road in a uniform display color and displays the connection road in a gradation color. The in-vehicle information terminal according to claim 1 or 2 ,
The in-vehicle information terminal characterized in that the display control means displays the dead-end road with a specific display. A summarizing target road determining means for determining, as a summarizing target road, a preset recommended route and a road selected according to a road type among roads intersecting the recommended route;
Summarizing map creating means for summarizing the summarizing target road determined by the summarizing target road determining means based on the road data included in the map data and creating a summary map;
A determination means for determining whether roads other than the recommended route among the roads to be summarized are dead ends, and the road data used for the summary of the road is a link connected from the intersection with the recommended route first. Judging means for sequentially checking, if the link is broken before the number of links reaches a predetermined value, the road is determined as a dead end road; otherwise, the road is determined as a connection road that is not a dead end ; ,
In the summary map, display changing means for representing the dead-end road and the connection road in different display forms;
A summary map generating device comprising: summary map output means for outputting a summary map in which the dead end road and the connection road are displayed in different display forms by the display changing means . A summarizing target road determining means for determining, as a summarizing target road, a preset recommended route and a road selected according to a road type among roads intersecting the recommended route;
Summarizing map creating means for summarizing the summarizing target road determined by the summarizing target road determining means based on the road data included in the map data and creating a summary map;
A determination means for determining whether roads other than the recommended route among the roads to be summarized are dead ends, and the road data used for the summary of the road is a link connected from the intersection with the recommended route first. If the link is broken before the distance from the intersection reaches a predetermined value, the road is determined as a dead end road, otherwise the road is determined as a connected road that is not a dead end. A determination means;
In the summary map, display changing means for representing the dead-end road and the connection road in different display forms;
A summary map generating device comprising: summary map output means for outputting a summary map in which the dead end road and the connection road are displayed in different display forms by the display changing means . A summary map display method in a map display device comprising a control circuit and display means,
By the control circuit,
A preset recommended route and a road selected according to the road type among roads intersecting with the recommended route are determined as summary target roads,
A summary map is created by summarizing the road to be summarized based on road data included in map data,
When determining whether roads other than the recommended route among the summarization target roads are dead ends, sequentially confirm the links connected to the recommended route from the intersection with the recommended route for the road data used for the summary of the road, If the link is broken before the number of links reaches a predetermined value, the road is determined as a dead end road, and if not, the road is determined as a connection road that is not a dead end.
When displaying the said summary map on the said display means, the said dead end road and the said connection road are displayed with a mutually different display form, The summary map display method characterized by the above-mentioned . A summary map display method in a map display device comprising a control circuit and display means,
By the control circuit,
A preset recommended route and a road selected according to the road type among roads intersecting with the recommended route are determined as summary target roads,
A summary map is created by summarizing the road to be summarized based on road data included in map data,
When determining whether roads other than the recommended route among the summarization target roads are dead ends, sequentially confirm the links connected to the recommended route from the intersection with the recommended route for the road data used for the summary of the road, If the link is broken before the distance from the intersection reaches a predetermined value, the road is determined as a dead end road; otherwise, the road is determined as a connected road that is not a dead end;
When displaying the said summary map on the said display means, the said dead end road and the said connection road are displayed with a mutually different display form, The summary map display method characterized by the above-mentioned .

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