JP3209823B2 - Car navigation system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-vehicle navigation device for guiding a vehicle by instructing a driver on a current position and a traveling direction of the vehicle. The present invention relates to a technology for selecting and providing effective guidance information.

[0002]

2. Description of the Related Art As a conventional on-vehicle navigation device, there is a device for obtaining a current position of a vehicle and displaying a road map near the obtained current position on a display device based on road map data stored in advance. Are known.

[0003] As described in Japanese Patent Application Laid-Open No. 64-75911, when a moving object passes through an intersection or a road, a driver of the moving object is instructed based on road map data stored in advance. There is also known a navigation apparatus that performs voice synthesis of predetermined guidance information and notifies the guidance information.

[0004]

According to the technology for displaying a road map on the display device, the size of the display surface of the display device is limited. There is a limit. For this reason, the driver cannot instantaneously check the road information in an area that is not displayed on the screen. Therefore, in the future (when traveling on this road), there is a doubt as to where to reach.

On the other hand, the scale is reduced (for example, 1/5
When a road map (wide area map) is displayed, the area of the road map that can be displayed on the screen is widened, but the amount of information displayed on the screen increases, and the amount of information displayed increases. The visual recognition time increases by the length of time, which causes a problem in terms of safety during traveling. In order to avoid this, if information is thinned out and displayed, there is a problem that the necessary information is more likely to be lost as much as the information is thinned out.

Next, according to the apparatus described in Japanese Patent Application Laid-Open No. 64-75911, the driver is not notified unless the moving body passes through an intersection or a road, so that only information at the current position can be obtained. Therefore, it is not suitable for traveling while predicting the destination (future) of the traveling process.

Accordingly, an object of the present invention is to provide an in-vehicle navigation device capable of providing effective guidance information for a driver even in an area other than a display area when guiding a vehicle to travel.

[0008]

To achieve the above object,
An on-vehicle navigation device, comprising: map data storage means for storing map data including road network data representing a road map and background data representing various backgrounds of a road; and position measurement means for determining a current position of a vehicle. Reading the road network data of the area including the current position of the vehicle determined by the position measuring means from the map data storage means, and displaying the road map represented by the read road network data on the display device. includes an output selecting means for displaying, what type of information outputs or settings, and a setting input unit for setting a search range of the output information, the ground
The map data storage means stores the road network data and the background data.
Linking some of the various backgrounds included in the
The output selection unit specifies a road on which a vehicle is traveling and a position of the vehicle on the road from the current position obtained by the position measurement unit and the read road network data. And, while displaying the position of the identified vehicle on the road map displayed on the display device in an identifiable manner, predicting the traveling route of the vehicle from the identified position and the identified road, the background near the predicted route is The road network data and the background data of the necessary district are read from the map data storage means, and the road network data and the background data are read.
It is determined whether the linkage information exists in the
If there is no information, search for the type of information set by the setting input means in the set search range,
If there is linkage information, the
There is provided an in-vehicle navigation device which searches for related background data and displays information on a background represented by the searched background data on the display means.

[0009]

According to the vehicle navigation apparatus of the present invention, the output selection means determines the road on which the vehicle is traveling from the current position obtained by the position measurement means and the read road network data. Locate the vehicle above,
While displaying the position of the specified vehicle on the road map displayed on the display device in an identifiable manner, predicting the traveling route of the vehicle from the specified position and the specified road, it is necessary to set a background near the predicted route as necessary. The road network data and the background data of the district are read from the map data storage means, and the linkage information is stored in the road network data and the background data.
It is determined whether there is any information, if there is no linkage information, for the type of information set by the setting input means,
Search within the set search range and find the linkage information.
If so, the background associated with the linkage information
The data is searched, and information on the background represented by the searched background data is displayed on the display means.

Therefore, the passing point information (roads, facilities, municipalities) and the road conditions of the peripheral area that cannot be displayed on the display device are output in real time according to the running conditions of the vehicle (the running road and the traveling direction). Therefore, the driver can easily understand the driving conditions, and the driving load can be reduced.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a vehicle-mounted navigation device according to the present invention will be described below.

FIG. 1 shows the configuration of an on-vehicle navigation device according to this embodiment.

In the figure, 1 is a position measuring means for calculating the current position of the vehicle, 2 is a map data storage means, 3 is a selection input means, 4 is a dynamic road information input means, 5 is an output selection means, 6
Is an output means.

The position measuring means 1 has a magnetic azimuth sensor and a distance sensor. Based on the traveling direction of the vehicle based on the direction of the geomagnetism detected by the magnetic azimuth sensor and the travel distance of the vehicle by the movement amount sensor. Calculate vehicle position on map coordinates.

The map data storage means 2 stores map data divided for each district. The map data includes road network data and background data.

The setting input means 3 is used to set display conditions such as audio and graphics output selection and output data reference values, and further includes a start switch for starting output. Dynamic road information input means 4
Is used to receive road traffic information that changes in real time from an information center via a receiving device provided outside the vehicle.

The output selecting means 5 reads out the map data of the target area obtained by the position measuring means 1 from the map data storing means 2, and according to the reference value of the output data set by the setting input means 3, the expected destination direction. Search for guidance information.
That is, when the vehicle is in a running state, the output selection unit 5 determines the vehicle position and the vehicle direction on the map coordinates calculated by the position measurement unit 1 and the reference values of the output data (output device, road traffic Calculates the search target area to output the guide information based on the necessity / unnecessity of information, whether or not to consider the traveling direction of the vehicle, the type of output information, and the search range of output information) Search for necessary guidance information from.

The output means 6 converts the guidance information and the road network image retrieved by the output selection means 5 into a CRT.
And a display device using a liquid crystal display or the like. Further, when the traveling guidance is started, a vehicle position that changes every moment is given from the position measuring means 1, so that a mark is displayed on the road network image displaying the vehicle position. Further, the output means 6 can output the information by voice from the voice output device at the timing when the guide information is searched.

First, the road network data is composed of link data and road attribute data, and the background data is composed of point data and background attribute data. In the road attribute data table, a link pointer is added to a link having a relationship with the background data, and the background data can be extracted by referring to a destination pointed by the pointer.

Here, the map data stored in the map data storage means will be described.

FIG. 12 shows the structure of the map data. As shown, the map data includes road network data a and background data b.

As shown in FIG. 12A, the road network data is
The link data 100 is composed of link data 100 and road attribute data 110, and the background data is composed of point data 120 and background attribute data 130.

The link data 100 is provided for each link constituting the road, and includes link identification data 101,
Data 1 indicating the position coordinates of the node points at both ends of the link
03, 105, node identification data 102, 104 serving as connection information with adjacent node points, and data 106 for designating road attribute data corresponding to the link.

The road attribute data stores data indicating additional information of the corresponding link.
Road types (expressways, national roads, prefectural roads, major local roads, narrow streets, etc.) 111 and road numbers (Tomei, Keihin, Route 1, 234
(Such as a road line) 112, an average travel time 113, various road attributes 114, and data 114 specifying background data 120 related to (attached to) the corresponding link.

As described above, the data 114 specifying the background data 120 related to the corresponding link directly links the road data and the background data. In this embodiment, among various backgrounds, background data on facilities attached to roads, such as service areas and expressway exits, and administrative boundaries that are boundaries of administrative districts are included in the data 114 by the data. Link to the road network data of the existing link. In this case, it is said that the associated road network data and background data have linkage information.

It should be noted that background data on public facilities and general facilities, such as city halls and department stores, is not related to road network data. That is, the data 114 for designating the background data of the department or the like is not particularly provided.

For nature such as water system and mountain system, it is assumed that linking to the road network data is optional.

The point data 120 is provided for each background, and the classification (public facilities, administrative boundaries, nature, administrative divisions, road auxiliary facilities, etc.) 121 to which the background belongs, its position coordinates 122, and corresponding to the background Background attribute data 130
It has data 123 to be specified.

The background attribute data 130 stores data indicating additional information of the corresponding background, and indicates the type of the background (city hall, municipalities, service areas, tunnels, water systems, mountain systems, city boundaries, etc.). Data 131, data 132 indicating its name, and data 13 indicating its shape and position
Two.

The on-vehicle navigation apparatus according to the present embodiment stores road traffic information linked to road network data in advance, as well as background data, and stores the road traffic information received by the dynamic road information input means 4. The information is linked with the road network data and stored.

Now, the on-vehicle navigation device shown in FIG. 1 can be actually configured using a CPU as shown in FIG.

That is, in FIG. 2, the position measuring means 1 in FIG. 1 includes a CPU 16, a magnetic direction sensor 7, a sensor amplifier 8, an A / D converter 9, a distance sensor 10, and a sensor I / O1.
1 is realized. The vehicle traveling direction based on the direction of the geomagnetism detected by the magnetic direction sensor 7 and the unit traveling distance of the vehicle detected by the distance sensor 10 are received via the A / D converter 9 and the sensor I / O 11, and based on this. , CP
U16 calculates the vehicle position with the starting point as the origin.

The map data storage means 2 in FIG. 1 is realized by an external storage device 12 and a media controller 13. The road network data and the background data read from the external storage device 12 are temporarily stored in the RAM 18.

The setting input means 3 shown in FIG. 1 includes a setting input section 14 for moving a displayed cursor, accepting a reference value of output selection and output guidance information at a cursor set position, and starting guidance information display, and This is realized by a switch I / O 15 that controls signals together with the CPU 16.

The dynamic road information input means 4 of FIG.
This is realized by an external information receiver 22 and a communication device I / O 23. The dynamic road information input means 4 receives external data such as traffic regulation information, traffic congestion information, accident occurrence information, road construction information, etc., which change from moment to moment.

Next, the output selection means 5 of FIG.
6 and the ROM 17 and the RAM 18. CPU16
Reads the map data of the display target area based on the vehicle position on the map coordinates calculated by the position measurement means 1 from the map data storage means 2 and stores it in the RAM 18. Similarly, the CPU 16 reads display conditions such as audio and graphics output selection and a search reference value for output guidance information from the setting input means 3 and stores them in the RAM 18. Also, the CPU 16
Is output guidance based on the vehicle position and the traveling direction of the vehicle on the running road on the map coordinates calculated by the position measuring means 1 and the search reference value of the output guidance information set by the setting input means 3. A search target area of information is obtained, and map data of this area is read from the map data storage means 2 and RA
Store it in M18.

Then, based on the road type and road number of the running road on the map coordinates calculated by the position measuring means 1, the road is traced toward the vehicle traveling direction, and other connecting roads, main facilities, Search guidance information while identifying municipalities, water systems, and mountain systems. The guide information searched here is written into the RAM 18. The position data of the vehicle calculated by the CPU 16 when the traveling guidance is started is also written in the RAM 18.

The display means 6 shown in FIG. 1 is realized by a graphic display controller 19, an image memory 21, and a display device 20. The CPU 16 is connected to an image memory 21 that can be directly accessed from the graphic display controller 19, and displays a road network image, guidance information, and the current vehicle information on the display device 20 based on the map data in the RAM 18 and the guidance information also stored in the RAM 18. Display the position.

Hereinafter, the operation of the vehicle-mounted navigation device according to this embodiment will be described.

In the car navigation system according to the present embodiment, when the current position is estimated by the position measuring means 1, the output selecting means 5 stores the map data of a district of a predetermined size including the estimated current position in the map data storing means 2. , And a road network image as shown in FIG.

Then, the process proceeds to a guide information search process.

FIG. 3 is a flowchart showing the procedure of this guide information search process.
Shown in

As shown in the figure, when the search criteria of the output guidance information is set by the setting input operation on the setting input means 3 in the display state of the road network image, the output selecting means 5 The process proceeds to the information search step 302 to execute a guide information search process (step 30). Here, designation of a search direction, a search distance, a search range, and output guide information is accepted as a search criterion of the output guide information. The specification of the search direction is a specification of a direction in which guidance information is to be extracted from the current position, and a specification of a direction such as an extension direction of a current traveling direction of a traveling road is accepted. The designation of the search distance is a specification of how far the guidance information centering on a point in the search direction from the current position is to be extracted. The specification of the search range is a specification of how much guidance information is to be extracted around a search distance point that is a point away from the current position in the search direction in the search direction. Is a specification of what kind of information is to be output as guidance information, such as information on public facilities,
Accepts information on general facilities, information on facilities attached to roads, administrative divisions, information on administrative boundaries, information on nature, road traffic information, etc.

The guidance information obtained in step 302 is displayed on the output means 6 together with the current position and the road network image as shown in step 303.

Thereafter, the current position data is calculated at predetermined time intervals, and each time the current position moves by an amount corresponding to one screen, the steps 302 and 303 are performed.
Is repeated (step 304).

The details of the guidance information search process in step 302 will be described.

Here, the description will be made on the assumption that the extension direction of the current traveling direction of the traveling road is specified as the search direction in step 301.

FIGS. 4 and 5 show the procedure of the guidance information search process in step 302 of FIG.

First, in step 401, the current traveling road of the vehicle is specified. Next, in step 402, the current position on the road on which the vehicle is traveling and the traveling direction of the vehicle are determined.

In step 403, in order to output guide information according to the search criterion of the output guide information received in step 301 in FIG.
A search target area suitable for specifying the search distance is estimated, and road network data and background data of the area are read from the map data storage means 2. The search target area is an area including the route from the current position to the search distance point.

Then, steps 404, 406, 40
According to the determinations in steps 8, 410, 413, step 40
At 5, 407, 409, 411, 412, and 414, guidance information to be output is extracted according to the designation of the output guidance information set in advance.

That is, when the information specified as the output guidance information includes information on the background of a specific classification, the background data on the background of this specific classification is linked to the road network data described above. If the background point data is not classified by the road attribute data and the data 115, the search distance and the search range are specified in steps 405 and 412. Based on this, background data on a background belonging to the classification is searched and extracted as guidance information.

On the other hand, there is a case where the information designated as the output guidance information includes information on the background of a specific classification, and the background data on the background of this specific classification is linked to the road network data described above. If the data is classified into a class having information on the road, that is, if the background point data is associated with the road attribute data and the data 115, the information is linked by the data 115 in Steps 407, 409 and 411. Based on the relationship, background data on the background of the classification in the search target area is searched and extracted as guidance information.

On the other hand, if the information specified as the output guide information includes road traffic information, step 414 is executed.
In, road traffic information on an estimated traveling road in the search target area is sequentially extracted.

Next, FIG. 6 shows a processing procedure for reading the road network data and the background data (map data) of the search target area in step 403 in FIG.

In this process, the next traveling road is predicted from the traveling road and its traveling direction, and the map data from the current position to the search distance point is read. In addition, facilities near the predicted traveling road, traffic information of the predicted traveling road, and the like are sequentially extracted.

That is, first, at step 501, the type of road and the road number (route number) of the currently traveling road are checked based on the currently traveling road, and this road is traced in the vehicle traveling direction.

Next, at step 502, it is determined whether or not a search distance point, which is a point following the specified search distance from the current position toward the traveling direction, has been reached, and if the search distance has been reached, the process is terminated.

If not reached yet, steps 503, 5
At 04 and 505, in order to correspond to the road identification number of the real-time traffic information in the post-processing, the identification number of the road link being followed on the road map data (FIG. 1).
2, 101) is stored, and the background data linked to the road network data is stored for use in post-processing. That is, in the map data diagrams 12 and 13, the data 106 of the link data 100 and the background data 120 linked to the road link tracing from the data 114 of the road attribute data are obtained and stored.

In order to use road traffic information linked to road network data as guidance information in post-processing,
The road traffic information on the road being followed is stored.

When the road being followed is out of the area of the currently read road map data, map data of the next district is read in steps 506 and 507.

Next, steps 405 and 412 in FIGS.
The guide information search process when the road network data and the background data have no linkage information will be described.

FIG. 7 shows this processing procedure.

In this case, the contents of the road network data and the background data have a structure as shown in FIG.

Therefore, in this processing, first, step 6
01, all the background data inside the specified search range around the search distance point, which is the point following the specified search distance from the current position to the traveling direction side, is the position information of the point data (FIG. 11). , 122) is extracted as guidance information. If the number of background data exceeds the number of guide information that can be output, only background data close to the search distance point is selected as guide information (step 60).
2).

Next, steps 407 and 40 in FIGS.
A description will be given of a process of searching for guidance information when the road network data and the background data have linkage information in 9 and 411.

FIG. 8 shows this processing procedure.

In this process, first, in step 701, all background data up to the search distance point stored in step 504 of FIG. 6 is extracted as guidance information. Then, the background data extracted to output the guide information in the order of travel is rearranged in order from the current position (step 7).
02).

Next, the process of searching for road traffic information in step 414 of FIG. 5 will be described.

FIG. 9 shows a processing procedure of this processing.

In this process, road traffic information is searched as guidance information while considering real-time traffic information.

First, at step 801, it is determined whether or not real-time traffic information has been input from the dynamic road information input means 4 since the previous guidance information output.

If not entered, step 50 in FIG.
The road traffic information stored in 5 is used as it is as case information.

If real-time traffic information has been input since the last time the guidance information was output, this information is shown in FIG.
It is determined using the link identification number stored in step 503 in FIG. 6 (step 802).

If it is not for the road that has been followed, it is determined whether or not all the input real-time traffic information has been processed. If all the real-time traffic information has been processed, the processing is terminated (step 805).

If it is on the road that has been followed, it is determined in step 803 whether or not it is for a section that overlaps with the road traffic information stored in step 505 in FIG.

If there is no overlap, it is determined in step 805 whether or not all the input real-time traffic information has been processed. If all of them have been processed, the processing is terminated.

If the sections overlap, real-time information is prioritized in step 804, and the road traffic information stored in step 505 in FIG. 6 is rewritten according to the contents of the corresponding real-time traffic information. Then, when the processing for all the input real-time traffic information is completed, all the processing is terminated (step 805).

Now, as described above, FIG.
When the search processing for the guidance information of No. 0 is completed, the extracted guidance information is processed in step 304 as described above, and the guidance information is output together with the road network image and the current position as shown in FIG. 6 is displayed on the display device. In the present embodiment, the name of the background and the like are displayed as guidance information on a sub-screen (sub-window) provided for displaying guidance information, in addition to the screen (window) displaying the map network image. Of course, the display form may be another form.

In the above description, the case where the traveling direction is specified as the search direction has been described. However, when this direction is not specified, or when the vehicle is stopped, as shown in FIG. Then, a search process for guidance information may be performed for both directions of the road on which the vehicle is traveling, and guidance information for both directions may be displayed.

Instead of displaying the guide information on the display device, the voice output device may output (notify) to the driver by a synthesized voice or the like.

Also, steps 405 and 412 in FIGS.
In the guidance information search process when the road network data and the background data have no linkage information, the background data within the specified search distance range from the specified search distance point are determined in the order from the closest to the search distance point. Although extracted as number guidance information (see FIG. 7), this step 405
In the case where the road network data and the background data in 412 have no linkage information, the guidance information search process in FIG.
0 may be performed.

FIG. 10 shows a second processing procedure of the guide information search processing in the case where the road network data and the background data have no linkage information in steps 405 and 412.

In this processing, a route calculation from each background data (facility) point to the estimated travel road being followed is performed, and only the background data for which the shortest route has been obtained is extracted.

In this process, first, in step 901, all background data inside the search range with the search distance point as the center is extracted. Next, adjacent road links are extracted based on the position information of each background data obtained in step 901 (step 902).

Next, an arbitrary position on each road link extracted in step 903 is set as a route calculation start point, and in step 904, a search distance point is set as a route calculation end point. Then, the route calculation from each set route calculation start point to the set route calculation end point is performed by using map data of an area within the search range centered on the search distance point and map data of a district including the search distance point. To obtain the shortest route (step 905).

Then, only the background data corresponding to the route calculation start point at which the shortest route was obtained in step 906 is selected as guidance information (step 90).
6).

In this way, as shown in FIG.
It is not necessary to output information about the background considered to be unnecessary as guide information, and it is possible to output only information about the background considered to be necessary as guide information.

As described above, according to the on-vehicle navigation device according to the present embodiment, at least one of the current position of the vehicle on the road and the traveling direction of the vehicle is determined using the road map data stored in advance. Appropriate guidance information can be displayed by predicting the traveling road and outputting traffic information on the roads, facilities, municipalities, and traveling roads predicted to pass to the output device.

[0090]

As described above, according to the present invention, it is possible to provide an on-vehicle navigation device which can provide effective guidance information for a driver even in a region outside the display when the vehicle is guided. it can.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a vehicle-mounted navigation device according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating a specific configuration example of a vehicle-mounted navigation device.

FIG. 3 is a flowchart showing the operation of the on-vehicle navigation device.
It is a chart.

FIG. 4 is a flowchart showing the first half of a guide information search processing procedure;

FIG. 5 is a flowchart showing the latter half of the guide information search processing procedure.

FIG. 6 is a flowchart showing a procedure for reading map data.

FIG. 7 is a first flowchart showing a guide information extraction processing procedure;

FIG. 8 is a second flowchart showing a guide information extraction processing procedure;

FIG. 9 is a third flowchart showing a procedure for extracting guidance information.

FIG. 10 is a fourth flowchart showing a guide information extraction processing procedure;
It is a chart.

FIG. 11 is a first explanatory diagram showing a process of extracting guidance information.

FIG. 12 is a second explanatory diagram illustrating a process of extracting guidance information.

FIG. 13 is a third explanatory diagram illustrating a process of extracting guidance information.

FIG. 14 is an explanatory diagram showing a display example of a road network image.

FIG. 15 is an explanatory diagram showing a first display example of guidance information.

FIG. 16 is an explanatory diagram showing a second display example of guidance information.

FIG. 17 is a fourth explanatory diagram showing a guide information extracting process.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Position measurement means 2 Map data storage means 3 Selection input means 4 Dynamic road information input means 5 Output selection means 6 Output means

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Claims (8)

(57) [Claims] 1. An on- vehicle navigation device, comprising: map data storage means for storing map data including road network data representing a road map and background data representing various backgrounds of a road; A display device; a display device; and a road map represented by the read road network data, wherein the road network data of the district including the current position of the vehicle determined by the position measurement unit is read from the map data storage unit. the display and output selecting means to be displayed on the device, what type of information outputs or settings, and, Bei a setting input unit for setting a search range of the output information
The map data storage means stores the road network data and the background
Relate to some of the backgrounds in the data
Further comprising linkage information, wherein the output selecting means specifies a road on which the vehicle is traveling and a position of the vehicle on the road from the current position obtained by the position measuring means and the read road network data. Displaying the position of the specified vehicle on the road map displayed on the display device so as to be identifiable, predicting the traveling route of the vehicle from the specified position and the specified road, and setting the background near the predicted route as necessary. The road network data and the background data of the area to be read are read out from the map data storage means, and the linkage information is stored in the road network data and the background data.
Is determined, and if there is no linkage information, the type of information set by the setting input means is searched in the set search range, and there is linkage information.
The background data associated with the linkage information.
A vehicle-mounted navigation device for searching for data and displaying information on a background expressed by the searched background data on the display means. 2. The on-vehicle navigation device according to claim 1, wherein the output selection unit determines a road on which a vehicle is traveling based on a current position obtained by the position measurement unit and the read road network data. And when specifying the position of the vehicle on the road, the driving direction of the vehicle is also specified, and the position of the specified vehicle is identifiably displayed on the road map displayed on the display device. The driving route of the vehicle is predicted from the specified driving direction and the specified road, and the background near the predicted route is retrieved by reading the road network data and the background data of the required area from the map data storage means. And a display unit for displaying information on a background represented by the searched background data on the display means. 3. A vehicle navigation system, comprising: map data storage means for storing map data including road network data representing a road map and background data representing various backgrounds of a road; and a current position of the vehicle. A display device; a display device; and a road map represented by the read road network data, wherein the road network data of the district including the current position of the vehicle determined by the position measurement unit is read from the map data storage unit. It includes an output selecting means for displaying on said display device, and a setting input unit for performing one of setting outputs what kind of information, the output selection unit, the current position of the position measuring means is determined From the read road network data, the road on which the vehicle is traveling, the position of the vehicle on the road and the traveling direction of the vehicle are specified, and the road map displayed on the display device is displayed on the road map. Along with displaying the position of the specified vehicle in an identifiable manner, the background existing within an area within a predetermined range whose position is determined by a point advanced a predetermined distance in the traveling direction of the specified road on the specified road, The road network data and the background data of the required area are read out from the map data storage means, and the road network data and the background data are linked to the link data.
Judge whether or not there is linkage information.
If the type of information set by the setting input means is searched, and there is linkage information,
A vehicle-mounted navigation device that searches for background data associated with image information and displays information on a background expressed by the searched background data on the display unit. 4. A vehicle navigation apparatus, comprising: map data storage means for storing map data including road network data representing a road map and background data representing various backgrounds of a road; and a current position of the vehicle. A display device; a display device; and a road map represented by the read road network data, wherein the road network data of the district including the current position of the vehicle determined by the position measurement unit is read from the map data storage unit. It includes an output selecting means for displaying on said display device, and a setting input unit for performing one of setting outputs what kind of information, the output selection unit, the current position of the position measuring means is determined From the read road network data, the road on which the vehicle is traveling, the position of the vehicle on the road and the traveling direction of the vehicle are specified, and the road map displayed on the display device is displayed on the road map. The position of the specified vehicle is displayed so as to be identifiable, and a background near the specified road is required between the position of the specified vehicle and a point traveling a predetermined distance on the road specified in the traveling direction. consisting of said road network data and background data area is read out from said map data storage means, a road
Whether the linkage information exists in the network data and background data
The determination, if the linkage information is not, then search for the type of information set by the setting input unit, phosphorus
If there is cage information, it is related by the linkage information.
An on- vehicle navigation device characterized by searching for background data to be attached, and displaying information on a background represented by the searched background data on the display means. 5. The on-vehicle navigation device according to claim 3, wherein the road traffic information data is stored in association with a point or a section on each road on a road map represented by the road network data. Having road traffic information recording means, wherein the output selecting means is a point or section on the specified road from a position of the specified vehicle to a point traveling a predetermined distance along a road specified in a traveling direction. The road traffic information associated with the road network data and the road traffic information data of the required area are read and searched, and the road traffic information expressed by the searched road traffic information data is displayed on the display means. An in-vehicle navigation device characterized in that the information is displayed on a navigation device. 6. The on-vehicle navigation device according to claim 5, further comprising: a dynamic road information input unit that receives a road traffic information broadcast corresponding to a point or a section on each road; The means, when searching the road traffic information, the dynamic road information input means from the position of the specified vehicle to a point traveling a predetermined distance along the road specified in the traveling direction, the specified When the road traffic information broadcast associated with the point or section on the road is received, the received road traffic information data is replaced with the road traffic information data of the corresponding point or section stored in the road traffic information storage means. An on-vehicle navigation device, wherein information is displayed on the display means and the content of the road traffic information storage means is updated with the received road traffic information. 7. The in-vehicle navigation device according to claim 1, further comprising: a voice output device that outputs a voice, wherein the output selecting unit transmits the information on the background to the display device. A vehicle-mounted navigation device characterized in that a voice is output from the voice output device in place of the display in (1) or together with the display on the display device. 8. The on-vehicle navigation device according to claim 5, further comprising a voice output device for outputting a voice, wherein the output selection unit replaces the road traffic information with a display on the display device. Alternatively, the in-vehicle navigation device outputs a voice from the voice output device together with the display on the display device.