JP6000879B2 - Route guidance device - Google Patents

Description

  The present invention relates to a route guidance device that performs route guidance along a route based on a route search result on a map image displayed on a display screen.

  In a route guidance device, for example, an in-vehicle navigation device, a route from a set departure point to a destination is displayed on a map on a display screen, and a current vehicle of a moving target is displayed on the map on the display screen. While displaying the position, route guidance along the route from the departure point to the destination is performed. Conventionally, in this route guidance, when the vehicle position approaches the intersection set to turn right or left on the route to be guided, as shown in FIG. Along with the map image MP of route guidance, an enlarged view (hereinafter referred to as an enlarged view of an intersection) CR of an area including the intersection position is displayed side by side (for example, Patent Document 1 (Japanese Patent Laid-Open No. 2002-2002)). No. 54936). In the route guidance map image MP, as shown in FIG. 15, the route is displayed with a bold line of a specific display color, for example, and highlighted, and the vehicle position is displayed with a specific mark MK.

  This intersection enlarged view CR is displayed on the display screen DSP together with the route guidance map image MP, so that the user can know the detailed positional information of the roads before and after the intersection in the route, Convenient.

JP 2002-54936 A

  However, conventionally, all of the roads in the vicinity of the intersection are generally displayed on the enlarged view of the intersection regardless of the route based on the route search result. For this reason, there are cases where a large number of roads unrelated to the route from the departure point to the destination are drawn together on the enlarged intersection view. In this way, if a road that has nothing to do with the route from the starting point to the destination is drawn together, it is rather confusing, the original route becomes difficult to understand, and it seems that it looks annoying There is also.

  An object of this invention is to provide the route guidance apparatus which can improve the above problem.

In order to solve the above problems, the invention of claim 1
On the map image displayed on the display screen, in the route guidance device that performs guidance along the route based on the route search result,
Level setting means for setting a display cost level for determining a display mode of the road on the map image based on a positional relationship between the route based on the route search result and the road on the map image;
Drawing means for drawing each of the roads in a display mode corresponding to the level set by the level setting means;
Equipped with a,
Regardless of whether the road is on a route based on the route search result, the level of the display cost of the road existing in the traveling direction of the guidance target in the route is related to the road on the route. The route guidance is set so as to increase, and the level of the display cost of the road existing in the direction intersecting the traveling direction is set so as to reduce the relationship with the road on the route. Providing equipment.

  The invention according to claim 2 relates to the relationship between the road on the map image and the route based on the route search result according to the set display cost level. It draws in the display mode according to the strength of.

According to this invention, in the level setting means, the level of the display cost for determining the display mode of the road on the map image is determined based on the positional relationship between the route and the road based on the route search result on the map. Determine and set. In the invention of claim 10 , the level of the display cost is set by the level setting means so that each road is displayed in a display mode corresponding to the strength of the positional relationship with the route based on the route search result. The

  According to the present invention, a road having a low positional relationship or a road having no positional relationship with the route along which the moving object travels is drawn by a drawing means, for example, at a low density so as to be inconspicuous on the map. It can be made to display.

The invention of claim 5 is the route guidance device according to any one of claims 1 to 4,
A function of drawing an enlarged view of an area including the intersection when a guidance object moving along the route based on the route search result approaches the intersection during the route guidance;
The level setting means sets the display cost level determined for a road existing in an area including the intersection corresponding to the enlarged view,
The drawing means provides a route guidance device that draws an enlarged view of an area including the intersection including a road drawn in a display mode corresponding to the level set by the level setting means.

According to the invention of claim 5, in an enlarged view of an intersection, a road that is not related to the route along which the moving object travels or a road that is not related is drawn at a low density, for example, so that it does not stand out on the map. Or can be hidden. For this reason, in the enlarged view of the intersection, it is expected that a road that is not related to the route or a road that is not related to the route and the road of the route will not be confused, and that the visual annoyance is improved.

  According to this invention, the display mode of the road on the map image can be controlled according to the level of the display cost set based on the positional relationship between the route based on the route search result and the road on the map image. it can. For this reason, roads that have little or no relation to the route on which the movement target travels can be displayed inconspicuously on the map, and roads that are not related to the route of the search result and the search result The road of this route will not be confused, and the appearance will be improved.

It is a block diagram which shows the structural example of embodiment of the route guidance apparatus by this invention. It is a figure which shows the flowchart for demonstrating operation | movement of 1st Embodiment of the route guidance apparatus by this invention. It is a figure which shows the flowchart for demonstrating the example of the flow of the level setting process of the display cost in 1st Embodiment of the route guidance apparatus by this invention. It is a figure which shows the example of the level of the display cost set by 1st Embodiment of the route guidance apparatus by this invention, and the figure which shows the example of the intersection enlarged view based on the level of the set display cost. It is a figure which shows the flowchart for demonstrating the example of the flow of the level setting process of the display cost in 2nd Embodiment of the route guidance apparatus by this invention. It is a figure which shows the example of the level of the display cost set by 2nd Embodiment of the route guidance apparatus by this invention, and the figure which shows the example of the intersection enlarged view based on the level of the set display cost. It is a figure which shows the flowchart for demonstrating the example of the flow of the level setting process of the display cost in 3rd Embodiment of the route guidance apparatus by this invention. It is a figure which shows the example of the level of the display cost set by 3rd Embodiment of the route guidance apparatus by this invention. It is a figure which shows the example of the level of the display cost set by 4th Embodiment of the route guidance apparatus by this invention. It is a figure which shows the example of the intersection enlarged view based on the level of the display cost set by 4th Embodiment of the route guidance apparatus by this invention. It is a figure for demonstrating the example of the flow of the level setting process of the display cost in 5th Embodiment of the route guidance apparatus by this invention. It is a figure which shows the example of the level of the display cost set by 5th Embodiment of the route guidance apparatus by this invention. It is a figure for demonstrating the example of the display mode of the link in 5th Embodiment of the route guidance apparatus by this invention. It is a figure for demonstrating the example of the flow of the level setting process of the display cost in 5th Embodiment of the route guidance apparatus by this invention. It is a figure for demonstrating an example of the display screen of a route guidance apparatus.

  Hereinafter, several embodiments of a route guidance apparatus according to the present invention will be described with reference to the drawings. The embodiment of the route guidance device described below is applied to a so-called car navigation device in which a moving object is an automobile. In the route guidance apparatus according to the embodiment described below, when the position of the vehicle approaches the intersection set to turn right or left on the route to be guided on the route obtained as a result of the route search. In addition, as shown in FIG. 15, the display screen DSP has a function of displaying a route guidance map image MP and an enlarged view of an area including the intersection position (hereinafter referred to as an enlarged intersection view) CR side by side. Prepare.

  And in the embodiment of the route guidance device described below, the intersection enlarged view is displayed so that the road that is not related to the route or the road that is not related to the route and the road of the route are not confused, By making inconspicuous roads that are unrelated to those routes or unrelated roads, it is displayed so that it can improve the annoying appearance.

[First Embodiment]
FIG. 1 is a block diagram showing a hardware configuration example of a route guidance apparatus according to the first embodiment of the present invention. The route guidance apparatus according to the first embodiment includes a configuration in which each unit described later is controlled by a control unit 10 including a microcomputer, for example.

  The control unit 10 includes a map data storage unit 11, a route search unit 12, a memory unit 13, a current position measurement unit 14, an operation input unit interface 15, and a display control unit 16 via the system bus 100. The route guidance display processing unit 17 is connected. An operation input unit 18 is connected to the operation input unit interface 15. The display control unit 16 is connected to a display unit 19 made of, for example, an LCD (Liquid Crystal Display).

  The operation input unit 18 includes a button operation unit and a touch panel arranged on the display screen of the display unit 19, in this example, the LCD screen. The control unit 10 has a function of detecting a button operation in the button operation unit and a function of detecting a touch operation through the touch panel. A software program for executing a function of the control unit 10 for detecting these operations is stored in the memory unit 13.

  The memory unit 13 also stores a software program for controlling the entire route guidance device. Further, in this example, the memory unit 13 includes a route search result storage unit 131 that stores information on the result of the route search executed by the route search unit 12.

  The map data storage unit 11 stores map data digitized so as to be usable by a computer, so-called electronic map data. The electronic map data in this example includes route search data for performing a route search. The route search data includes link data corresponding to the road in the smallest unit of the travel route, data of nodes representing road end points such as intersections and dead ends, landmark information, and the like. That is, the route search data is data representing the road network by a plurality of nodes and links connecting the nodes.

  The link data includes a link ID (identification) for identifying the link, link attribute information such as a road name and a road type corresponding to the link, and an evaluation value of the road such as an average travel time of the link (link Cost). The node data includes a node ID for identifying each node, node attribute information such as an intersection and a dead end, and the like. Both ends of the road corresponding to the link are defined by two nodes, and the link data and the data of the nodes at both ends of the link are stored correspondingly. The link cost is determined based on factors such as the type of road, the presence or absence of tolls, the occurrence rate of traffic congestion, and the like.

  The route search unit 12 refers to the route search data in the map data storage unit 11 on the basis of information such as the departure place, destination, and waypoint set by the user through the operation input unit 18, and uses the link cost as a reference. The route search is performed, and the optimum route from the departure point to the destination through the waypoint is obtained. The obtained route information of the search result is stored in the route search result storage unit 131 of the memory unit 13.

  The current position measurement unit 14 detects the position of the vehicle using, for example, an autonomous navigation assistance function using a gyro in addition to a GPS (Global Positioning System) positioning function. In the route guidance process described later, a map image is displayed on the display screen such that the vehicle position measured by the current position measurement unit 14 is located at the center of the display screen, for example. On the route guidance display screen, the vehicle position is displayed by the specific mark as described above so that the user can easily see it.

  The route guidance display processing unit 17 includes a route guidance image creation unit 171 and an intersection enlarged view creation unit 172. The intersection enlarged view creation unit 172 includes a display cost level setting unit 173. The route guidance display processing unit 17 is activated when a user performs a route guidance start input operation through the operation input unit 18.

  The route guidance image creation unit 171 is set based on the route search result stored in the route search result storage unit 131 of the memory unit 13 when a route guidance start input operation is performed through the operation input unit 18. Route guidance map image information for executing route guidance from a certain departure point to a destination is created. The route guidance image creation unit 171 updates the route guidance map image information according to the current position obtained by positioning by the current position measurement unit 14.

  In this example, the enlarged intersection map creation unit 172 indicates that the current position during the route guidance in the route guidance display processing unit 17 indicates the intersection direction instead of the straight traveling direction of the route of the route search result with respect to the traveling direction. Fired when approaching an intersection. When activated, the intersection enlarged view creation unit 172 evaluates and sets the level of the display cost for the link corresponding to the road in the area for creating the enlarged intersection view as described later. Then, the intersection enlarged view creation unit 172 controls the display mode of the road corresponding to the link according to the display cost level of the evaluation result, or the road that is not related to the route or the road that is not related to the route. Display inconspicuously to prevent confusing those roads and route roads, and also to improve the visual annoyance.

  The route search unit 12, the display control unit 16, and the route guidance display processing unit 17 are described as discrete functional units in the configuration of FIG. 1, but these are stored in the memory unit 13 by the control unit 10. It can be realized as a software function unit realized by executing a software program.

[Example of Processing Operation of Route Guidance Display Processing Unit 17 in First Embodiment]
As described above, in the route guidance device, when the user inputs the setting of the starting point, the destination, and the waypoint as needed through the operation input unit 18 and receives the route search request, the route search is performed. The unit 12 searches for the optimum route from the departure point to the destination through the waypoint, and stores the route of the search result in the route search result storage unit 131 of the memory unit 13.

  When a route search is performed by the route search unit 12 and a route guidance start request is made through the operation input unit 18 in a state where the route search result is stored in the route search result storage unit 131, a route guidance display process is performed. The unit 17 is activated.

  FIG. 2 is an example of a flowchart for explaining an example of the processing operation of the route guidance display processing unit 17.

  First, the route guidance display processing unit 17 activates the route guidance image creation unit 171, electronic map data in the map data storage unit 11, information on the route search result from the route search result storage unit 131, and current position measurement. Based on the data of the current position of the vehicle from the unit 14, a map image for route guidance is created and displayed on the display screen of the display unit 19 (step S101). The route guidance map image is displayed at a scale designated by the user.

  Here, the route guidance map image created by the route guidance image creation unit 171 is a map image centered on the current position of the host vehicle obtained by measurement by the current position measurement unit 14, and the map image Above, the road of the route determined based on the route search result stored in the route search result storage unit 131 is highlighted, and the current position mark is displayed on the road of the route. ing. Then, the route guidance image creation unit 171 changes the map image on the display screen to the movement of the vehicle so that the current position mark of the vehicle changes on the map as the current position of the vehicle moves. Change with it.

  Next, the route guidance display processing unit 17 determines whether or not the current position of the own vehicle has become the display start position of the enlarged intersection map (step S102). Here, “the current position of the vehicle has become the display start position of the enlarged intersection view” means that the route search result ahead of the intersection intersects the traveling direction, not the straight traveling direction. This is a time when the direction is indicated, and the current position of the own vehicle is a position a predetermined distance away from the intersection.

  When it is determined in step S102 that the current position of the vehicle is not the display start position of the enlarged intersection map, the route guidance display processing unit 17 returns the process to step S101 and performs the process of step S101. Do.

  Further, when it is determined in step S102 that the current position of the host vehicle has become the display start position of the enlarged intersection map, the route guidance display processing unit 17 activates the enlarged intersection map creation unit 172 to create the enlarged intersection map. The display screen is divided and displayed in parallel with the map image for route guidance as described above (step S103). A detailed processing example of the intersection enlarged view creation unit 172 will be described later.

  Next, the route guidance display processing unit 17 determines whether or not the current position of the host vehicle has reached the display end position of the enlarged intersection view (step S104). Here, the current position of the own vehicle has become the display end position of the enlarged intersection view when the current position of the own vehicle has passed the intersection.

  If it is determined in step S104 that the current position of the vehicle is not the display end position of the enlarged intersection map, the route guidance display processing unit 17 displays the route guidance map image and the enlarged intersection map in parallel. The state to be continued is continued. If it is determined in step S104 that the current position of the vehicle has reached the display end position of the enlarged intersection map, the route guidance display processing unit 17 ends the processing operation of the enlarged intersection map creation unit 172 and displays the display screen. The display of the enlarged intersection view is terminated (step S105).

  Next, the route guidance display processing unit 17 monitors the operation input through the operation input unit 18 and determines whether or not there is an instruction to end the route guidance (step S106). Returning to step S101, the processing after step S101 is repeated. When it is determined in step S106 that an end instruction has been given, the route guidance display processing unit 17 ends the route guidance display processing routine of FIG.

[Example of processing operation of the enlarged intersection creation unit 172 in the first embodiment]
Next, an example of the processing operation of the intersection enlarged view creation unit 172 in the first embodiment will be described with reference to the flowchart of FIG. 3 and FIG. 4 illustrating an example of the processing result.

  When the intersection enlarged view creation unit 172 is activated, first, an area for creating an enlarged intersection view is determined, and nodes and links included in the area are collected from the map data storage unit 11. Then, the intersection enlarged view creation unit 172 activates the display cost level setting unit 173, and in the first embodiment, sets the display cost level for all the collected links (step S111). ).

  Here, the level of the display cost for the link indicates the degree of displaying the link inconspicuously, and the higher the level, the greater the degree of displaying the road corresponding to the link inconspicuously. ing. That is, if the link display cost level is “0”, the degree of inconspicuousness is “0”, which means that the road corresponding to the link is displayed most clearly, and the numerical value of the level can be increased. The higher the degree of inconspicuousness of the road corresponding to the link.

  An example of the processing operation of the display cost level setting unit 173 in the first embodiment will be described below. The display cost level setting unit 173 sets the level of the display cost of the link according to the positional relationship between the link corresponding to each road and the route of the route search result. In the first embodiment, The display cost level setting unit 173 sets the display cost level by paying particular attention to the connection relationship with the route of the link route search result.

  That is, when the link is directly connected to the route of the route search result, it is assumed that the relationship between the link and the route is high and the display cost level is low. When the link is indirectly connected to the route of the route search result via another link, the display cost level is set higher as the number of other links sandwiched between them is larger. In other words, the link that is indirectly connected to the route via another link has a higher display cost level as the degree of separation from the route increases.

  In the first embodiment, when the link has no connection with the route of the route search result, the display cost level is set to a negative value and excluded from the link displayed on the display screen.

  Based on the above, the display cost level setting unit 173 first sets the level of the display cost of the link corresponding to the route stored in the route search result storage unit 131 in the area where the enlarged intersection map is created. “0” is set (step S112). That is, the road corresponding to the link corresponding to the route is set to a level at which the road is most prominently displayed.

  Next, the display cost level setting unit 173 sets the display cost level of links not connected to any link to “−1” in the area (step S113).

  Next, the display cost level setting unit 173 sets the display cost level of all links directly connected to the link corresponding to the route to “1” (step S114). Then, the display cost level setting unit 173 sets the variable i for repetition processing (i is an integer) to an initial value i = 1 (step S115), and sets the display cost level to “i”. The display cost level of all links connected to the link is set to “i + 1” (step S116).

  Next, the display cost level setting unit 173 determines whether or not the setting of the display cost level has been completed for all links in the area where the enlarged intersection map is created (step S117), and determines that it has not been completed. Sometimes, the variable i for repetitive processing is changed to “i = i + 1” (step S118), the processing is returned to step S116, and the processing after step S116 is repeated.

  If it is determined in step S117 that the display cost level setting has been completed for all links in the area, the display cost level setting unit 173 notifies the intersection enlarged view creation unit 172 of the setting result. Upon receipt of this notification, the intersection enlarged view creation unit 172 determines the display mode of the road corresponding to the link according to the set display cost level of all the links, and displays the enlarged intersection view on the display screen (step). S119). This is the end of the intersection enlarged view creation processing routine in the case of the first embodiment.

  FIG. 4A shows an example of the display cost level set for each link in the area of the enlarged intersection set by the display cost level setting unit 173 in the first embodiment. In FIG. 4A, the set display cost level of each link is shown as a numerical value surrounded by a square on each link. The same applies to the examples of display cost levels to be described later.

  That is, in FIG. 4A, links L0a, L0b, L0c, L0d, and L0e indicated by bold lines are links of the route search result, and the display cost level is “0” in step S112 described above. Set to The link Lno that is not connected to the route links L0a, L0b, L0c, L0d, and L0e in the area of the enlarged intersection is set to the display cost level of “−1” in step S113 described above. .

  Then, each of the links L1a, L1b, L1c, L1d, L1e, L1f, L1g, and L1h that are directly connected to the links L0a, L0b, L0c, L0d, and L0e of this route are set in step S114 described above. The display cost level is set to “1”. The links L2a, L2b, L2c, L2d, L2e, L2f, L2g, L2h, L2i, L2j, L2k, L2l, L2m, L2n, and L2o that are directly connected to the links L1a to L1h are respectively In step S116 described above when the variable i for repetitive processing is i = 1, the display cost level is set to “2”. Furthermore, in the example of FIG. 4A, the display cost level of the link L3j connected to the link L2j or the link L2k whose display cost level is set to “2” is the variable i for the iterative process. In step S116 described above when i = 2, “3” is set.

  In this embodiment, the intersection enlarged view creation unit 172 determines the shade of the road corresponding to each link according to the display cost level of each link set as described above, and creates an enlarged intersection view. In this case, as the display density of the road corresponding to the link whose display cost level is “0” becomes the highest, and the display cost level increases as “1” → “2” → “3”, respectively, The display density of the road corresponding to the link is sequentially displayed so as to become lighter. In this embodiment, the link whose display cost level is “−1” is excluded from the display target.

  An example of the intersection enlarged view CR1 in the first embodiment, which is displayed when the display cost level of each link in the area displayed as the intersection enlarged view is set as shown in FIG. As shown in FIG. As shown in FIG. 4B, according to the intersection enlarged view CR1 of the first embodiment, the link Lno having no connection relationship with the route is not displayed in the intersection enlarged view CR1. The display density of each link is determined according to the connection relationship with the path of each link and the degree of separation from the path.

  Accordingly, roads that are not related to the route or roads that are not related to the route are displayed inconspicuously, and the roads of the route and those roads are prevented from being confused. Also, roads that are not related to the route are displayed, and roads that are not related to the route are inconspicuous.

[Second Embodiment]
The route guidance device according to the second embodiment is different from that of the route guidance device according to the first embodiment in that the processing operation of the display cost level setting unit 173 in the enlarged intersection creation unit 172 of the route guidance display processing unit 17 is the same as that of the route guidance device of the first embodiment. Different. The other configurations of the route guidance apparatus of the second embodiment are the same as the hardware configuration example shown in FIG. 1 and the outline of the processing of the route guidance image creation unit 171 of the route guidance display processing unit 17 shown in FIG. Including, it is configured in exactly the same way as the route guidance device of the first embodiment.

In the first embodiment described above, the link display cost level is set based only on the connection relationship with the route of the route search result. However, in the route guidance, the user shows a high degree of interest (attention level) for the link ahead in the direction of travel, but the interest in the link that intersects the direction of travel is too high. No degree (attention level) is shown. Therefore, in the second embodiment, in the setting of the display cost level after “1”, not only the connection relationship between the link with the display cost level set and the unset link but also the connection angle is considered. By doing so, the connectivity with the link whose display cost level is already set is high, but the display cost level of the link corresponding to the road that the user does not need to care about is set to be high .

  FIG. 5 is a flowchart for explaining a processing operation example of the intersection enlarged view creation unit 172 in the second embodiment.

  The intersection enlarged map creating unit 172 of the second embodiment first determines an area for creating an enlarged intersection map in the same manner as in the first embodiment, and stores the nodes and links included in the area as map data. Collected from the unit 11 (step S201). Then, the intersection enlarged view creation unit 172 activates the display cost level setting unit 173 and performs the display cost level for the link of the route in exactly the same manner as in steps S102 to S104 in FIG. 3 of the first embodiment described above. Is set to “0”, the display cost level is set to [−1] for the link that is not connected to the link of the route, and the display cost level is set to “−1” for the link that is connected to the link of the route. Processing up to the setting of “1” is performed (step S202).

  Next, the display cost level setting unit 173 sets a variable i (i is an integer) for iterative processing to an initial value i = 1 (step S203), and sets the display cost level to “i”. The connection angle between the link connected to the link and the link whose display cost level is “i” is referred to (step S204).

  Whether the link angle of the link connected to the link with the display cost level “i” for the link with the display cost level “i” is 180 degrees or a predetermined angle other than 180 degrees, That is, it is determined whether the direction is straight or crossing (step S205). When it is determined in this step S205 that the direction is straight ahead, the display cost level setting unit 173 displays the display cost of the link connected in the straight direction with respect to the link whose display cost level is set to “i”. The level is set to “i + 1” (step S206). If it is determined in step S205 that the direction is the crossing direction, the display cost level setting unit 173 displays the display cost of the link connected in the crossing direction with respect to the link whose display cost level is set to “i”. Is set to “i + 2” (step S207).

  Then, after step S206 or step S207, the display cost level setting means 173 determines whether or not the display cost level has been set for all the links in the area where the enlarged intersection map is created (step S208). When it is determined that the process has not been completed, the variable i for the repetitive process is changed to “i = i + 1” (step S209), the process returns to step S204, and the processes after step S204 are repeated.

  If it is determined in step S208 that the display cost level setting has been completed for all links in the area, the display cost level setting unit 173 notifies the intersection enlarged view creation unit 172 of the setting result. Upon receipt of this notification, the intersection enlarged view creation unit 172 determines the display mode of the road corresponding to the link according to the set display cost level of all the links, and displays the enlarged intersection view on the display screen (step). S210). This is the end of the intersection enlarged view creation processing routine in the case of the second embodiment.

  FIG. 6A shows an example of the display cost level set for each link in the area when the above-described second embodiment is applied to the same area as the intersection enlarged view shown in FIG. . As can be seen by comparing FIG. 6A with FIG. 4A described above, for the links L1b, L1d, L1e, L1f, and L1g whose display cost level is set to “1”, The display cost level of the links L2d, L2e, L2h, L2j, L2k, L2m, and L2n connected in the crossing direction is “2” in FIG. In this case, it is “3”, and the relationship is further lowered. Further, since the level of the display cost of the link L3a is in the crossing direction with respect to both the link L2j and the link L2k, what is “3” in FIG. 4A is shown in FIG. Then, it is “4”, and the relationship is further lowered.

An example of the intersection enlarged view CR2 in the second embodiment, which is displayed when the display cost level of each link in the area displayed as the intersection enlarged view is set as shown in FIG. As shown in FIG. As can be seen from FIG. 6B, according to the intersection enlarged view CR2 of the second embodiment, as in the first embodiment, the display density of each link is connected to the route of each link. In addition, for links connected to links whose display cost level is “1” or higher, the connection angle with the level-set link is more straight ahead than the straight direction. In the case of the intersection direction, the display cost level is set higher. Therefore, according to the second embodiment, the above-described links L2d, L2e, L2h, L2j, L2k, L2m, L2n, and L3a, which are assumed to have a lower relationship with the road corresponding to the link of the route, It is set higher than the level of display cost in the first embodiment, for example, the display density is made lighter and made less noticeable on the display screen.

  In the second embodiment described above, in the setting of the display cost level after “1”, the link with the display cost level set (the display cost level is “i”) and the unset link If the connection angle is in the straight direction, the display cost level of the unset link is “i + 1”, and if the connection angle is the crossing direction, the display cost level of the unset link is “i + 2”. As such, the degree of change in the display cost level is changed. However, in the second embodiment, instead of changing the degree of changing the display cost level to a higher level, the link with the display cost level already set (the display cost level is “i”) and the unset When the connection angle with the link is straight, the display cost level of the unset link is “i + 1”, but when the connection angle is the crossing direction, the display cost level of the unset link is May be set so that the link whose connection angle is in the crossing direction is not displayed.

[Third Embodiment]
In the route guidance device of the third embodiment, the processing operation of the display cost level setting unit 173 out of the intersection enlarged view creation unit 172 of the route guidance display processing unit 17 is the same as that of the route guidance device of the first embodiment. Is different. The other components of the route guidance apparatus according to the third embodiment are the hardware configuration example shown in FIG. 1 and the outline of the processing of the route guidance image creation unit 171 of the route guidance display processing unit 17 shown in FIG. Including the route guidance apparatus of the first embodiment.

[Example of processing operation of the intersection enlarged view creation unit 172 in the third embodiment]
In general, it is important for a user (driver) who uses route guidance in a car navigation apparatus to turn at a target intersection, so what is the destination of the target intersection in the direction of travel before turning at the target intersection? Or show a high degree of interest. On the other hand, since the user (driver) only needs to know the target intersection to bend, there is often no need to display in detail the destination at the target intersection.

  In the third embodiment, the above points are taken into consideration. That is, in the third embodiment, in the enlarged view of the intersection, the link ahead of the target intersection that needs to be displayed in detail is more related to the link of the route, and the target Since it is not necessary to display in detail the point where the intersection is bent, the relationship between the route and the link is reduced.

  FIG. 7 is a flowchart for explaining a processing operation example of the intersection enlarged view creation unit 172 according to the third embodiment.

  In the same way as in the first embodiment, the intersection enlarged view creation unit 172 of the second embodiment defines an area for creating an enlarged intersection view, and maps and stores the nodes and links included in the area. Collect from. Then, the intersection enlarged view creation unit 172 activates the display cost level setting unit 173 to set the display cost level for all the collected links (step S301).

  First, the display cost level setting unit 173 sets the level of the display cost of the link to the intersection among the links corresponding to the route stored in the route search result storage unit 131 in the area where the enlarged intersection map is created. “0” is set (step S302).

  Next, the display cost level setting unit 173 determines whether the link that is not connected to the link corresponding to the route in the area, that is, the link corresponding to the route directly or indirectly. The level of the display cost of the link not sharing is set to “−1” (step S303).

  Next, the display cost level setting unit 173 sets the display cost level of the link connected ahead of the intersection in the straight traveling direction (traveling direction) to “0” (step S304). Next, the display cost level setting unit 173 sets the display cost level of the link corresponding to the route, which is a link ahead of the intersection, to “1”, and sets the display cost level to “0”. The level of the display cost of all links connected to the set link is set to “1” (step S305).

  Then, the display cost level setting unit 173 sets the variable i (i is an integer) for repetition processing to an initial value i = 1 (step S306), and sets the display cost level to “i”. The display cost level of all links connected to the link is set to “i + 1” (step S307).

  Next, the display cost level setting unit 173 determines whether or not the setting of the display cost level has been completed for all links in the area where the enlarged intersection map is created (step S308), and determines that it has not been completed. Sometimes, the variable i for the repetitive process is changed to “i = i + 1” (step S309), the process returns to step S307, and the processes after step S307 are repeated.

  If it is determined in step S308 that the display cost level setting has been completed for all links in the area, the display cost level setting unit 173 notifies the intersection enlarged view creation unit 172 of the setting result. Upon receipt of this notification, the intersection enlarged view creation unit 172 determines the display mode of the road corresponding to the link according to the set display cost level of all the links, and displays the enlarged intersection view on the display screen (step). S310). This is the end of the intersection enlarged view creation processing routine in the case of the third embodiment.

  FIG. 8 shows an example of the display cost level set for each link in the area when the third embodiment described above is applied to the same area as the intersection enlarged view shown in FIG. As can be seen by comparing FIG. 8 with FIG. 4A described above, the level of the display cost of the links L0d and L0e ahead of the intersection is the link corresponding to the route. What was “0” in FIG. 4A is now “1” in FIG. For this reason, the links L1g and L1h connected to the links L0d and L0e are “1” in FIG. 4A and “2” in FIG.

  On the other hand, even if the link does not correspond to the route, the display cost level of the link L1f ahead of the intersection in the traveling direction is “0” in FIG. For this reason, the level of the display cost of the links L2k, L2l, and L2m connected to the link L1f is “2” in FIG. 4A, but is “1” in FIG. Further, the display cost level of the link L3a connected to the link L2k is “3” in FIG. 4A but is “2” in FIG.

  From the above, according to the third embodiment, the situation of the road ahead of the intersection is displayed in more detail than in the case of the first embodiment, and is ahead of the intersection. The road situation is displayed in a display mode in which the relationship with the route is lower than in the case of the first embodiment, and the route guidance of the car navigation is used than in the case of the first embodiment. It is possible to provide an easy-to-understand enlarged view of the intersection that matches the user's (driver) requirements.

[Fourth Embodiment]
The fourth embodiment is an example in which the third embodiment and the second embodiment described above are combined. That is, steps S301 to S305 in FIG. 7 of the third embodiment described above are used until the link display cost level in the area of the intersection enlarged view is set to “1”. Then, for the setting of the display cost level of the link after the display cost level is set to “1”, the steps after step S203 in FIG. 5 of the second embodiment are used.

  FIG. 9 shows an example of the display cost level set for each link in the area when the fourth embodiment is applied to the same area as the intersection enlarged view shown in FIGS. 4, 6 and 8. Indicates. As can be seen from a comparison between FIG. 9 and FIG. 8 described above, the same is true for the links with the set display cost level up to “1”. Then, the links L1a, L1b, L1d, L1e, L2k, L2m and the links L2b, L2d, L2e, L2h connected to the links L0d, L0e in which the display cost level is set to “1”. , L2j, L3a, L2m, L2o and L1h, L1g display cost levels are “2” in FIG. 8 but “3” in FIG.

  An example of the intersection enlarged view CR4 in the fourth embodiment, which is displayed when the display cost level of each link in the area displayed as the enlarged intersection view is set as shown in FIG. 9, is shown in FIG. Show. As can be seen from FIG. 10, according to the intersection enlarged view CR4 of the fourth embodiment, as in the first embodiment, the display density of each link is determined from the connection relationship with the route of each link and the route. For links that are connected to links whose display cost level is “1” or higher, the connection angle with the level-set link is the crossing direction rather than the straight direction. In the case of, a higher display cost level is set. Furthermore, according to the fourth embodiment, the situation of the road ahead of the intersection is displayed in more detail than in the case of the third embodiment, and the road is ahead of the intersection. This situation is displayed in such a display manner that the relationship with the route is lower than in the case of the third embodiment, and can be an enlarged view of the intersection that matches the request of the user (driver).

[Fifth Embodiment]
In the above embodiment, the display cost level setting unit 173 sets the display cost level for the link of the area for creating the enlarged intersection map. However, the level of the display cost is set for each node that defines the link of the area for creating the enlarged intersection map, and the display mode of the road corresponding to the link between the nodes is determined according to the setting result. Also good. In this case, the display cost level set for the nodes is used for determining the display mode of the road corresponding to the link connected between the nodes.

  The fifth embodiment is an example of such a case, and the display cost level setting means 173 sets the display cost level for all the nodes in the area where the enlarged intersection map is created. Accordingly, the other configuration of the route guidance apparatus of the fifth embodiment is the outline of the processing of the hardware configuration example shown in FIG. 1 and the route guidance image creation unit 171 of the route guidance display processing unit 17 shown in FIG. Including the route guidance apparatus of the first embodiment.

  FIG. 11 is a flowchart for explaining a processing operation example of the intersection enlarged view creation unit 172 in the fifth embodiment.

  The intersection enlarged view creation unit 172 of the fifth embodiment defines an area for creating an enlarged intersection view, and collects all nodes and links included in the area from the map data storage unit 11. Then, the intersection enlarged view creation unit 172 activates the display cost level setting unit 173 to set the display cost level for all the collected nodes (step S401).

  First, the display cost level setting unit 173 sets the display cost level of all nodes connecting the links corresponding to the routes stored in the route search result storage unit 131 to “0” in the area where the enlarged intersection map is created. (Step S402). Next, the display cost level setting unit 173 sets the display cost level of the node on the unset side of the link connected to the link corresponding to the route to “1” (step S403).

  Next, the display cost level setting unit 173 sets the variable j (j is an integer) for the iterative process to an initial value j = 1 (step S404), and sets the display cost level to “j”. The display cost level of the node on the other side of the link connected to the selected node is set to “j + 1” (step S405).

  Next, the display cost level setting unit 173 determines whether or not the display cost level has been set for all the nodes in the area where the intersection enlarged view is created (step S406), and determines that it has not been completed. Sometimes, the variable j for the repetitive process is changed to “j = j + 1” (step S407), the process returns to step S405, and the processes after step S405 are repeated.

  If it is determined in step S406 that the setting of the display cost level has been completed for all the nodes in the area, the display cost level setting unit 173 notifies the intersection enlarged view creation unit 172 of the setting result. Upon receiving this notification, the intersection enlarged view creation unit 172 determines the display mode of the road corresponding to the link according to the set display cost level of all the nodes, and displays the enlarged intersection view on the display screen (Step S1). S408). This is the end of the intersection enlarged view creation processing routine in the case of the fifth embodiment.

  In FIG. 12, when this fifth embodiment is applied to the area of the same enlarged intersection as in the first to fourth embodiments described above, it is set to all nodes for the area. The example of the level of display cost is shown.

  That is, in FIG. 12A, all of the nodes N1 to N6 included in the links L0a, L0b, L0c, L0d, and L0e indicated by the bold lines corresponding to the route of the route search result are displayed at the display cost in step S402 described above. Is set to “0”.

  In this fifth embodiment, the link Lno that is not connected to the route links L0a, L0b, L0c, L0d, and L0e does not have any nodes in the area of the enlarged intersection view. Deviate from. For this reason, in the fifth embodiment, the road corresponding to the link Lno is not a drawing target in the enlarged intersection view.

  Then, each of the nodes N7 to N13 at the other end of the links L1a, L1b, L1c, L1d, L1e, L1f, L1g, and L1h connected to each of the nodes N1 to N6 in the path is in step S403 described above. The display cost level is set to “1”.

  The links L2a, L2c, L2d, L2f, links that are connected to each of the nodes N7 to N13 whose display cost level is set to “1” and whose other end node is not set. The nodes N14 to N23 at the other end of each of L2g, L2i, L2j, L2k, L2l, L2n, and L2o are displayed at the display cost in step S405 described above when the variable j for iterative processing is j = 1. Is set to “2”. Further, in the example of FIG. 12, the level of the display cost of the node N24 at the other end of the link L3a that is connected to the node N20 whose display cost level is set to “2” Therefore, the variable j is set to “3” in the above-described step S405 when j = 2.

  In this embodiment, the intersection enlarged view creation unit 172 changes the shade of the road corresponding to the link between the two end nodes to the display cost level set for the nodes at the both ends as described above. Determine accordingly and create an enlarged view of the intersection. In this case, when the display cost level set in the two nodes at both ends of the link is the same, the intersection enlarged view creation unit 172 determines the shade of the road corresponding to the link based on the display cost level. . However, the display cost level set for the two nodes at both ends of the link may be different. In this case, the intersection enlarged view creation unit 172 may select one of several determination methods as described below. One determines the shade of the road corresponding to the link between the nodes at its ends.

  FIG. 13 is a diagram for explaining a method for determining the shade of the road corresponding to the link between the nodes at both ends when the level of the display cost set for the two nodes at both ends of the link is different.

  In the method shown in FIG. 13A, the link between the nodes at both ends is handled based on the lower level of the display cost levels set at the nodes Na and Nb at both ends of the link L. Determine the shade of the road. Further, in the method shown in FIG. 13B, based on the higher level of the display cost levels set at the nodes Na and Nb at both ends of the link L, the distance between the nodes Na and Nb at both ends is set. The shade of the road corresponding to the link L is determined. In the method shown in FIG. 13C, the link L between the nodes Na and Nb at both ends is based on the average value of the display cost levels set at the nodes Na and Nb at both ends of the link L. Determine the shade of the corresponding road. Further, in the method shown in FIG. 13D, the lightness and darkness of the road corresponding to the link L is gradually adjusted so as to correspond to the display cost levels set at the nodes Na and Nb at both ends of the link L. This is a method of changing the display mode to a so-called gradation display mode.

  The intersection enlarged view creation unit 172 may use the link display mode of any one of FIGS. 13A to 13D in advance, or may be used through the operation input unit 18 in advance. It is also possible for the person to select which display mode of FIGS. 13A to 13D displays the road corresponding to the link, and to display the selected display mode. .

  It goes without saying that the same effect as in the fourth embodiment can be obtained in the fifth embodiment. And according to this 5th Embodiment, since the level of the display cost of a link is set about the node of the both ends of a link, the node (some of the nodes of all the links included in the area of an intersection enlarged view) Node is outside the area), but there is no node for links that are not connected to any link, so there is a merit that it is automatically removed from the display target from the enlarged intersection map .

  In the example of FIG. 11, in the setting of the display cost level after the display cost level “i = 1”, the display cost level is “i” as in the first embodiment described above. The display cost level of a node was set based only on the connection relationship with the node. However, even when the level of the display cost is set for the node according to the fifth embodiment, not only the connection relation but also the node in the traveling direction as in the second to fourth embodiments described above. Set the display cost level considering whether it is in the direction that intersects the direction of travel, whether the node is in the direction of travel ahead of the intersection, or whether it is in the direction around the intersection, etc. You may make it do.

[Sixth Embodiment]
In the intersection enlarged view creation unit 172 in the first to fourth embodiments described above, the display cost level setting unit 173 is configured to set the display cost level for all links in the area where the intersection enlarged view is created. . However, as in the sixth embodiment described below, in the area where an enlarged intersection is created, a link is searched from the route as a base point, and a branch is extended from the route, and displayed on the searched link. You may make it set the level of cost.

  According to the sixth embodiment, in the area where the enlarged intersection map is created, the link having no connection with the link directly or indirectly connected to the route sets the display cost level. Not eligible. For this reason, in the case of the above-described first to fourth embodiments, a link having no connection with a link directly or indirectly connected to the route has a display cost level of “−1”. Is not required, and the processing can be simplified.

  A processing example of the intersection enlarged view creation unit 171 in the sixth embodiment is shown in a flowchart of FIG. Also in the case of the sixth embodiment, any of the first to fourth embodiments described above is applied in setting the display cost level after the display cost level “i = 1”. be able to. The example of FIG. 11 described below is a case where the technique of the first embodiment is used to set the display cost level after the display cost level “i = 1”.

  In the sixth embodiment, the intersection enlarged view creation unit 171 first sets an intersection enlarged view creation area and activates the display cost level setting unit 172 (step S501). The display cost level setting unit 172 first detects a link corresponding to a route in the area for creating an enlarged intersection, and sets the display cost level of the detected link to “0” (step S502).

  Next, the display cost level setting unit 172 detects the link connected to the link corresponding to the route, and sets the display cost level of the detected link to “1” (step S503).

  Next, the display cost level setting unit 173 sets a variable i (i is an integer) for iterative processing to an initial value i = 1 (step S504), and sets the display cost level to “i”. The link connected to the detected link is detected, and the display cost level of the detected link is set to “i + 1” (step S505).

  Next, the display cost level setting unit 173 determines whether or not there remains a link whose display cost level is not set in the area where the enlarged intersection map is created (step S506), and there is an unset link. Is determined, the variable i for the repetitive process is changed to “i = i + 1” (step S507), the process returns to step S505, and the processes after step S505 are repeated.

  If it is determined in step S506 that there is no unset link in the area, the display cost level setting unit 173 notifies the intersection enlarged view creation unit 172 of the setting result. Upon receipt of this notification, the intersection enlarged view creation unit 172 determines the display mode of the road corresponding to the link according to the set display cost level of all the links, and displays the enlarged intersection view on the display screen (step). S508). This is the end of the intersection enlarged view creation process routine in the case of the sixth embodiment.

  The above description of the sixth embodiment is a case where the level of the display cost is set for the link. Similarly to the case of the fifth embodiment, when the level of the display cost is set for the node, This sixth embodiment is applicable.

[Other Embodiments or Modifications]
In the above description of the embodiment, the road display mode determined according to the level of the display cost set for the link or node is the road density on the displayed map, but the road display mode is It is not limited to the concentration. For example, by determining the color of the road on the displayed map according to the level of the display cost set for the link or node, the road corresponding to the link is displayed according to the relationship with the route. May be.

  The display mode of the road may be a combination of color and density. For example, as the display mode of the road, all links may be the same color, and the density may be changed according to the display cost level, or the road may be displayed in a different color according to the display cost level. While displaying, the density for each different color may be changed according to the level of display cost.

  Moreover, you may make it use the transparent and semi-transparent aspect for the display aspect of a road. In that case, the greater the display cost level, the higher the transparency of the road.

  Further, the road display mode may be made inconspicuous by narrowing the line width as the display cost level increases.

  In the fifth embodiment, the gradation display shown in FIG. 13D is used as the road display mode corresponding to the link when the display cost level is set for the node. Even when a display cost level is set for a link, gradation display may be used for links before and after the level changes.

  Further, in the above-described embodiment, in the area of the intersection enlarged view, a link that is not connected to another link has a display cost level of “−1” in the above example, and the road corresponding to the link is Not displayed, but not displayed, and is displayed in a specific display mode, for example, a specific color, to notify the user that the road is not connected to other roads. May be.

  Further, in the above-described embodiment, the road corresponding to the link is displayed with the display mode changed according to the level of the display cost set for the link or the node. However, if the level of display cost set for links or nodes is higher than a certain level, the roads corresponding to those links and the roads identified by those nodes should be hidden. May be. In that case, the user may be able to select the boundary level for whether or not to hide.

  The enlargement ratio of the area (display area) of the intersection enlarged view is not set to a predetermined value fixed in advance, but is considered a road that is not displayed or a road that has no meaning to be displayed because the relationship is thin. On the other hand, an enlargement ratio at which a road corresponding to a link having high connectivity with respect to a route including the current position is sufficiently displayed may be calculated and determined from the calculation result. For example, there are many links with low connectivity to the route around the area of the enlarged intersection map, and when the roads corresponding to those links are hidden, the area around the enlarged intersection map area is blank, By that amount, it is possible to give a more detailed display by enlarging the enlargement ratio of the intersection enlarged view.

  In the above-described embodiment, the display cost level is set for each link unit. However, instead of setting the display cost level for each link, for example, the display cost level is evaluated in units of link strings that connect multiple continuous links, such as the same road name and the same road type. In addition, the entire road corresponding to the link row unit may be controlled to be drawn in a display mode corresponding to the display cost level set in the link row.

  Further, in the above-described embodiment, the positional relationship between the route based on the route search result serving as a reference for setting the level of the display cost and the road on the map image is only the connection relationship, the connection relationship and the connection direction thereof. (Directly traveling direction or crossing direction), connection relationship and whether the connection is a straight ahead direction or a crossing direction ahead of the intersection are given as examples, but are not limited thereto. For example, the display cost level may be set according to the distance between the route based on the route search result and the road on the map image.

  Further, in the above-described embodiment, the present invention is applied to an enlarged intersection view displayed when the current position approaches an intersection designated as a route on the display screen during route guidance. Explained the case. However, the present invention is not applied only to the display of such an enlarged view of the intersection, and may always be performed on a normal display screen during route guidance. In this case, the user can switch between the display mode in which the road display mode is changed according to the level of display cost according to the present invention and the normal mode in which all roads are displayed in the same display mode as before. You may do it.

  In the route guidance device, the current position (vehicle position) is displayed while displaying the map on the display screen as well as the state in which the route search is performed by setting the departure point and the destination and performing route search. There is also a mode to display. Even in this mode, the level of the display cost is set for the link or node corresponding to the road in the traveling direction or the road in the crossing direction on the basis of the currently traveling road, and the road corresponding to the set level is set. It is also possible to change and display the display mode. However, in that case, every time the current position (vehicle position) moves, for example, by a predetermined distance, the display cost level is recalculated and the road display mode of the display map image on the display screen is updated. Like that.

  In the above-described embodiment, the route guidance device includes the map data storage unit 11, the route search unit 12, and the route guidance display processing unit 17. The present invention is configured only by the route guidance device. It is a case where it is made possible. However, the route guidance device of the present invention can also be configured as a system in which a server device and a client device are connected through a network.

  In that case, the server device includes a map data storage unit 11, a route search unit 12, a memory unit 13, and a route guidance display processing unit 17 in the configuration of FIG. The client device includes a memory unit 13, a current position measurement unit 14, an operation input unit interface 15, an operation input unit 18, a display control unit 16, and a display unit 19, and includes a communication unit with the server device. be able to.

  In the configuration, the server device performs a route search in response to a route search request accompanied by information on the departure point and destination from the client device, and stores the result in the memory unit. Further, the server device receives the route guidance request from the client device and creates a route guidance map image using the route guidance image creation unit 171 and the enlarged intersection creation unit 172 of the route guidance display processing unit 17. To the client device. The client device can receive the route guidance service by receiving the image information from the server device and displaying it on the display unit 19.

  The client device is provided with the function of the route guidance display processing unit, for example, by receiving it from the server device as an application program, etc., and receiving provision of map information, route search result information, etc. from the server device. It is also possible to create a map image of route guidance and an enlarged view of the intersection with the own device and display them on the display screen of the display unit 19. For example, the client device may be configured as a high-functional telephone terminal (so-called smartphone) that can be connected to the server device via the Internet.

  Moreover, although the above-mentioned embodiment took the case of the route guidance apparatus as a car navigation apparatus whose moving object is a motor vehicle, for example, the route guidance device of this invention is not only when the moving object is a car. For example, the present invention can be applied to a bicycle or a pedestrian.

  DESCRIPTION OF SYMBOLS 10 ... Control part, 11 ... Map data storage part, 12 ... Route search part, 131 ... Route search result storage part, 14 ... Current position measurement part, 17 ... Route guidance display processing part, 18 ... Operation input part, 19 ... Display , 171... Route guidance image creation unit, 172.

Claims (14)

On the map image displayed on the display screen, in the route guidance device that performs guidance along the route based on the route search result,
Level setting means for setting a display cost level for determining a display mode of the road on the map image based on a positional relationship between the route based on the route search result and the road on the map image;
Drawing means for drawing each of the roads in a display mode corresponding to the level set by the level setting means;
Equipped with a,
Regardless of whether the road is on a route based on the route search result, the level of the display cost of the road existing in the traveling direction of the guidance target in the route is related to the road on the route. The route guidance is set so as to increase, and the level of the display cost of the road existing in the direction intersecting the traveling direction is set so as to reduce the relationship with the road on the route. apparatus. The drawing means draws the road on the map image in a display mode according to the strength of the relationship with the route based on the route search result according to the set display cost level. The route guidance device according to claim 1. The positional relationship between the route and the road based on the route search result on the map serving as a reference for determining the level of the display cost is a connection relationship between the route based on the route search result of the road. The route guidance device according to claim 1 or 2, characterized by the above. The positional relationship between the route and the road based on the route search result on the map serving as a reference for determining the level of the display cost includes a connection angle of the road with respect to the traveling direction of the guidance target in the route, The level of the display cost of the road in the direction intersecting the traveling direction is set higher than the level of the display cost of the road in the traveling direction. The route guidance apparatus described. A function of drawing an enlarged view of an area including the intersection when a guidance object moving along the route based on the route search result approaches the intersection during the route guidance;
The level setting means sets the level of the display cost for a road existing in an area including the intersection corresponding to the enlarged view,
Said drawing means any of claims 1 to 4, characterized in that to draw the enlarged view of the area including the intersection including road drawn in a display mode corresponding to the level set by the level setting means A route guidance device according to any one of the above. The route guidance device according to claim 5 , wherein the level setting unit sets the level of the display cost for each link included in an area including the intersection corresponding to the enlarged view. The connection relationship of the road with the route based on the route information of the route search result is that the road is in a direct connection relationship with the route based on the route information of the route search result or an intermittent connection relationship. And in the case of the intermittent connection relationship, it may be changed according to the number of other roads existing between the road and the route based on the route information of the route search result. The route guidance device according to claim 2, wherein On the map image displayed on the display screen, in the route guidance device that performs guidance along the route based on the route search result,
Level setting means for setting a display cost level for determining a display mode of the road on the map image based on a positional relationship between the route based on the route search result and the road on the map image;
Drawing means for drawing each of the roads in a display mode corresponding to the level set by the level setting means;
With
A function of drawing an enlarged view of an area including the intersection when a guidance object moving along the route based on the route search result approaches the intersection during the route guidance;
The level setting means sets the level of the display cost for a road existing in an area including the intersection corresponding to the enlarged view,
The drawing means draws an enlarged view of an area including the intersection including a road drawn in a display mode according to the level set by the level setting means,
It said level setting means, each of the nodes to define the links included in the area including the intersection corresponding to the enlarged view, the display cost ROUTE guiding device you and sets the level of. The route guidance device according to claim 6 or 8, wherein the level setting means sets the level of the display cost in a unit of a link row connecting a plurality of links having continuity. When the front Symbol link nodes at both ends to a set level are different, the drawing means, the road of the link, according to claim 8, characterized in that for drawing in the display mode corresponding to one of the levels the navigation system. When the front Symbol link nodes at both ends to a set level are different, the drawing means, the road of the link, be drawn in a display mode corresponding to the average value of both the level to claim 8, wherein The route guidance apparatus described . When the front Symbol link nodes at both ends to a set level are different, the drawing means, the road of the link, the display mode corresponding to the level of one node, the display mode corresponding to the level of the other node The route guidance device according to claim 8, wherein the drawing is performed so as to change sequentially. Before Symbol rendering means, road no connection relationship between the route based on the route information of the route search results, as hidden, the route guidance apparatus according to claim 5 or claim 8, characterized in that it is drawn. The drawing means has, as the display mode, any one of display attributes including display density, transparency, line width, color, etc. of the road on the map image, or a plurality of selected display attributes. The route guidance device according to claim 1 or 8 , wherein a combination of the above is used.

Images