JPH0792906A - Road map modification data supplying device - Google Patents

Abstract

PURPOSE:To provide a road map modification data supplying device which easily supplies modification data corresponding to newly installed road constitution and others to an on-vehicle navigation device. CONSTITUTION:A device 2 is beforehand provided with a modification data input device 11 (for example, a cassette deck). When a small and inexpensive external storage medium 10 (for example a cassette tape), in which only modification data are beforehand stored, is inserted to the device 11, the data are read by the device 11 and are stored in a modification data storage section 12. A modification data reading section 13 reads the modification data from the section 12 and modifies the road map data stored in a road data expansion memory 6 based on the modification data.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a newly constructed road or bridge,
The present invention relates to a device for inexpensively supplying correction data corresponding to a road structure such as a tunnel or correction data for correcting an error to a vehicle-mounted navigation device.

[0002]

2. Description of the Related Art Conventionally, in order to support the traveling of a vehicle on an unfamiliar land, a navigation device has been provided which displays the current position of the vehicle together with a map around the vehicle on a display device composed of a CRT or the like. It is installed in a vehicle and used. Such a navigation device generally includes a distance sensor and an azimuth sensor, and the output of each of these sensors is given to the position detector. The position detection unit detects the current position data of the vehicle based on the output of each sensor, and the detected current position data is given to the control unit (computer). The control unit CD-ROs the road map data of a certain range around the detected current position.
The current position is read out from the map memory composed of M and the like and is displayed on the display device together with the map of the surrounding area.

The road map data previously stored in the map memory is generally created based on a paper map created based on aerial photographs. Therefore,
When a road component such as a road, a bridge, or a tunnel is newly installed after taking an aerial photograph, the road component is not included in the road map data. Therefore, in order to enhance the service to users, the manufacturer needs to revise the map memory with the correction data corresponding to the newly-established road structure, and newly manufacture it as a revised version to provide it to the user. . Further, even if there is an error in the road map data stored in the map memory, it is necessary to newly manufacture a corrected map memory as a revised version and provide it to the user in the same manner as above. .

On the other hand, if the user wants to display the newly constructed road component on the map, he must purchase a new map memory containing the newly constructed road component, and the road map data is erroneous. The same applies when there is.

[0005]

By the way, in general, manufacturing a map memory requires a relatively high cost. Therefore, the price of the map memory is set to be relatively high, and the user cannot easily replace the map memory with another. On the other hand, considering the manufacturing cost, the manufacturer cannot manufacture a new map memory each time a road structure is newly installed, so that the latest map memory cannot be promptly provided to the user. there were.

On the other hand, the data capacity of the correction data corresponding to the newly constructed road structure and the correction data for correcting an error is much smaller than the data capacity of the road map data. Therefore, for example, if only the correction data is to be stored, the storage device having a very small storage capacity, for example, a cassette tape or a mini disk is sufficient. Further, recently, most vehicles are equipped with a device (cassette deck etc.) for reproducing cassette tapes and the like.

Therefore, an object of the present invention is to use on-vehicle correction data corresponding to a newly installed road structure or the like and correction data for correcting an error by utilizing a storage means having a small storage capacity and an existing reproducing device. An object of the present invention is to provide a road map correction data supply device that can be supplied to a navigation device at low cost.

[0008]

According to a first aspect of the present invention, there is provided a road map correction data supply device for supplying road map correction data to a vehicle-mounted navigation device. The correction data includes at least a node number, an X coordinate, a Y coordinate and an adjacent node number of a node corresponding to a correction point of a road, and only the correction data is stored in advance in an external storage medium and the external storage medium. Reading means for reading the correction data that has been read,
The correction data storage means for storing the correction data read by the reading means, the correction data stored in the correction data storage means, and the road map data stored in the map data expansion storage means And a correcting means for correcting based on the read correction data. The on-vehicle navigation device and the road map correction data supply device may be integrated or may be separate bodies.

Further, in the road map correction data supply device according to the second aspect, the external storage medium stores the node number of the node corresponding to the correction point of the road, the correction code indicating the correction method, and the content corresponding to the correction method. At least the correction data including the correction data is stored in advance, and the recognition means for recognizing the correction method and the content corresponding to the correction code included in the correction data read by the correction means, and the correction recognized by the recognition means Conversion means for converting the correction data into correction data including at least a node number, an X coordinate, a Y coordinate, and an adjacent node number of a node corresponding to a correction point of a road, based on the method and the contents. And

Further, in the road map correction data supply device according to the third aspect, the external storage medium is constituted by a cassette tape or a mini disk. According to a fourth aspect of the present invention, there is provided the road map correction data supplying device, wherein the external storage medium comprises a system for taking the correction data into the vehicle from outside the vehicle through a communication network.

[0011]

In the structure according to the above-mentioned claim 1, the external storage medium has the node number of the node corresponding to the corrected portion of the road, X
The correction data including at least the coordinate, the Y coordinate, and the adjacent node number is stored. Here, the corrected data is
For example, it is data corresponding to newly established roads, bridges, and tunnels, and data for correcting errors in road map data. The correction data stored in this external storage medium is read by the reading means and stored in the correction data storage means. The correction data stored in the correction data storage means is read by the correction data reading section, and the road map data temporarily stored in the road map data expansion storage means is corrected based on the read correction data. To be done.

Since the external storage medium stores only the correction data, a small storage capacity is sufficient. That is, for example, a cassette tape or a mini disk can be applied to this external storage medium, as in the configuration according to claim 3. Since these cassette tapes and the like can be manufactured and sold at low cost, the correction data can be inexpensively supplied to the vehicle-mounted navigation device.

According to the second aspect of the present invention, the correction data including at least the node number of the node corresponding to the correction point of the road, the correction code indicating the correction method, and the content corresponding to the correction method is stored in advance in the external storage medium. Has been done.
In the present configuration, the recognition means recognizes the correction content corresponding to the correction code, and then based on the recognized correction content, the correction data including at least the node number and the correction code is added to the node number, the X coordinate, the Y coordinate, and the adjacency. It is converted into modified data including at least the node number. As a result, the in-vehicle navigation device can recognize the correction content corresponding to the correction code, and can cope with various correction methods.

Further, in the configuration according to claim 4, since the correction data can be taken into the vehicle from outside the vehicle via the communication network, the user has to spend a lot of time to purchase an external storage medium in which the correction data is stored. Can be omitted.

[0015]

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a block diagram showing the configuration of a navigation system according to a first embodiment of the present invention. This navigation system includes a vehicle-mounted navigation device 1 and a road map correction data supply device 2 that supplies correction data to the vehicle-mounted navigation device 1. The on-vehicle navigation device 1 and the road map correction data supply device 2 may be integrated or may be separate bodies.

More specifically, the vehicle-mounted navigation device 1 has a distance sensor and a direction sensor (not shown), and the output of each sensor is given to the position detector 3. The position detecting unit 3 detects the current position data of the vehicle based on the output of each sensor, and the current position data is given to the map data reading unit 4. The position detecting unit 3 is configured to detect the current position of the vehicle based on the outputs of the distance sensor and the azimuth sensor.
For example, so-called GPS navigation may be used in which the current position of the vehicle is detected by measuring the propagation delay time of radio waves radiated from a GPS (Global Positioning System) satellite.

When the current position data is given, the map data reading unit 4 reads road map data of a certain range around the current position from a map memory 5 composed of a CD-ROM or the like, and the current position data and the road. The map data is given to the map data expansion memory 6. The road map data stored in the map memory 5 is composed of a combination of nodes and links. Here, a node is generally a coordinate position for identifying an intersection or a bending point of a road, and a link is a vector connecting the nodes. The specific structure of the road map data will be described later.

The current position data and road map data given to the map data developing memory 6 are temporarily stored in the map data developing memory 6 and then given to the graphic data converting section 7. The current position data and road map data are converted into graphic data by the graphic data conversion unit 7, and then temporarily stored in the image memory 8. The graphic data corresponding to the current position and the map around the current position temporarily stored in the image memory 8 are given to the display unit 9 at a predetermined timing, and the display unit 9 displays the current position in an overlapping manner on the map. .

On the other hand, the road map correction data supply device 2 is
The vehicle is provided with a correction data input device 11 composed of a cassette deck, a mini disk reproducing device, and the like, which are installed in advance in the vehicle, and the correction data input device 11 includes an external storage medium 10 composed of a cassette tape, a mini disk, or the like.
When is inserted, the correction data input device 11 reads the correction data stored in the external storage medium 10. This correction data is correct data for correcting an error in data or road map data corresponding to road components such as newly established roads, bridges, and tunnels. In addition, data corresponding to a building such as a hotel newly built along the road can be included in the correction data.
The detailed structure of the correction data will be described later. The correction data read by the correction data input device 11 is given to and stored in the correction data storage unit 12 composed of, for example, a flash memory (EEPROM) capable of electrically erasing the data.

The map correction data supply device 2 also includes a correction data reading section 13. This correction data reading unit 1
3, the current position data of the vehicle is given from the position detecting unit 3 via the line 14, and the correction data reading unit 13
When the current position data is given, the user accesses the correction data storage unit 12 and confirms whether or not the correction data exists in the map within a certain range around the current position. as a result,
If there is correction data in the above map, correction data storage unit 1
The correction data is read from No. 2, and the road map data temporarily stored in the map data developing memory 6 is corrected based on the read correction data.

The method of correcting the road map data will be specifically described. For example, when a road is newly established, the map memory 5 does not store the road map data corresponding to the new road. 13 adds the road map data corresponding to the new road to the position where the new road exists based on the read correction data. If the road map data stored in the map data expansion memory 6 has an error, for example, if the road map data corresponding to the road is stored although there is no road, the correction data reading unit 13 Deletes the road map data corresponding to the road based on the read correction data. As a result, the corrected road map data is given to the graphic data conversion unit 7 and the image memory 8, so that the display unit 9 displays the latest map including the newly constructed road component. Become.

2 and 3 (b) are views for explaining the structure of the road map data stored in the map memory 5, and FIG. 4 (b) is a diagram for storing the road map data in the external storage medium 10. It is a figure for demonstrating the structure of the correction data which exists. In addition,
FIG. 4 (a) is a map in which a road 30 indicated by a broken line is newly added to the map of FIG. 3 (a). The road map data stored in the map memory 5 is, for example, as shown in FIG. 2, the node number 2 for identifying the node corresponding to the corrected portion of the road.
0, X coordinate 21 indicating the coordinate position where the node exists,
It includes the Y coordinate 22, the line type 23 of the link connected to the node, the number of nodes 24 at the end of the link, and the node number 25 of the node at the end. Here, the line type 23 is for identifying which type of road the link represents, of the types of roads classified as highways, national roads, and prefectural roads. Expressways are represented as "1" and national roads as "2".

The road map data will be described in detail. In the case of the map shown in FIG. 3 (a), the road map data corresponding to this map is as shown in FIG. 3 (b). Here, in FIG. 3A, “◯” marks represent nodes, and the numbers written in the vicinity of each “◯” mark represent node numbers. In addition, the solid line connecting each "○" mark represents a link.

For example, the node with node number 1004 will be described. This node 1004 is located at the position of X coordinate 5 and Y coordinate 5 in the coordinate system shown in FIG. 3 (a), and the line type is, for example, expressway. Is “1”.
Further, since two links are connected to the node 1004 in front and back, the number of nodes ahead of each link is "2" and the node numbers thereof are "1002" and "1006".
Such contents are stored for all nodes.

On the other hand, the correction data stored in the external storage medium 10 is data about the node related to the newly established road 30. That is, as shown in FIG. 4A, since the nodes related to the new road 30 are the node 1004 and the node 1003, this node 1004
Only data about 1003 is stored in the external storage medium 10 as correction data.

More specifically, since the number of new roads 30 in the node 1004 has increased by one, the number of nodes ahead of the link that has been connected has increased by one.
As shown in (b), the number of nodes at the end of the link is
Has been changed from “2” to “3”, and the increased node number “1003” has been added to the node number. Similarly, in the node 1003, the number of nodes at the destination of the link is increased by one, so that the number of nodes is changed from “2” to “3”.
In addition, “1004” is added to the node number.

As described above, according to the vehicle-mounted navigation system of the present embodiment, the external storage medium 10 having a very small storage capacity and the existing correction data input device 11 can be used to supply the correction data, so that the manufacturer corrects the correction data. There is no need to manufacture a new CD-ROM with additional data,
It suffices to manufacture an inexpensive external storage medium 10 having a small storage capacity that stores only the correction data. Therefore, the manufacturer can reduce the manufacturing cost. Therefore, even if a road structure is newly installed in the future, the latest road map data including the newly installed road structure can be promptly provided to the user.

On the other hand, since the user can give the correction data to the vehicle-mounted navigation device 1 by purchasing the inexpensive external storage medium 10 having a small storage capacity, the economical burden becomes lighter than the conventional one. . Further, for example, if the external storage medium 10 is rented to the user for a fee, the user can obtain the correction data at a lower cost than the actual purchase, so that the economical burden is further reduced.

FIG. 5 is a diagram for explaining the second embodiment of the present invention. In the second embodiment, the external storage medium 10 stores correction data in the format shown in FIG. That is, the correction data according to the present embodiment is
It comprises a node number 30 of the node to be modified, a modification code 31 corresponding to the modification method, and data 32 representing the content corresponding to the modification method. For example, using the example of the first embodiment, the link 1004 is "1004,
04, 1, 1003 ”is the external storage medium 10
Will be stored in. Here, the contents represented by the respective numbers will be described in order. The node number 30 and the correction code 3
1, the number of added nodes, and the node number of the added node. Table 1 shows the correspondence between the correction code 31 and the correction method.

[0030]

[Table 1]

Here, it is difficult to cope with various modifications in the vehicle-mounted navigation device 1 only by the first embodiment. Therefore, in the present embodiment, a configuration shown by a broken line in FIG. 1 is added so that the vehicle-mounted navigation device 1 can recognize the correction method. That is, the correction data reading unit 13 is connected to the correction data analysis unit 40 which stores the correspondence shown in Table 1 in advance,
The correction data read out by the correction data reading unit 13 is analyzed by the correction data analyzing unit 40. When the correction data analysis unit 40 analyzes which correction method the correction code 31 corresponds to, the correction data is given to the correction data conversion unit 41, and the correction data conversion unit 41 compares the correction data with the first embodiment. After being converted into a similar format (see FIG. 2), it is given to the map data expansion memory 6 via the line 42.

As described above, if the correction data is formed in the format of this embodiment, the data capacity of the correction data can be further reduced as compared with the first embodiment. Therefore, the external storage medium 10 having a smaller storage capacity is used. be able to. Therefore, the manufacturing cost can be further reduced. FIG. 6 is a block diagram showing the configuration of a vehicle-mounted navigation system according to the third embodiment of the present invention. The in-vehicle navigation system according to the present embodiment is characterized in that the automobile data transmission / reception system 50 is applied as the external storage medium 10.

More specifically, the automobile data transmission / reception system 50 includes a central center 51 for providing correction data, a mobile telephone 52, a mobile telephone network 53 connecting the central center 51 and the mobile telephone 52, and a automobile. The interface unit 54 is interposed between the telephone 52 and the correction data input device 11. More specifically, when the user accesses the central center 51 from the mobile phone 52 and requests the correction data,
The correction data from the central center 51 is the car telephone network 5.
3 to the car telephone 52. Thereafter, the correction data is given from the automobile telephone 52 to the interface unit 54, and then given to the correction data input device 11. Subsequent operations are the same as those in the first embodiment described above, and will be omitted.

As described above, when the automobile data transmission / reception system 50 is applied as the external storage medium, the manufacturer can transmit the correction data using the automobile telephone network 53 without manufacturing the external storage medium 10. The cost can be reduced. Further, since the user can use the conventional mobile phone 52 and only needs to access from the mobile phone 52 to obtain the correction data, the economical burden is further reduced and the external storage medium is also available. You can save the trouble of purchasing 10.

In the above embodiment, the configuration using the automobile telephone line network 53 as the automobile data transmission / reception system 50 has been described, but a configuration using a roadside beacon device installed on the roadside may be used, for example. Further, the present invention can be applied to various configurations in which correction data can be obtained from a vehicle, as well as a configuration using FM multiplex communication or a configuration using an information supply station connected by wire.

Although the embodiments have been described above, the present invention is not limited to the above embodiments. For example, in the above-described embodiment, the correction data reading unit 13 has been described as a structure for correcting the road map data when the current position data detected by the position detecting unit 3 is given. This is not limited to when the current position data is given.

For example, in the vehicle-mounted navigation device 1 to which the function of setting a destination is added, if it is known in advance that a road component or the like is newly installed near the destination, The road map data may be read by the map data developing memory 6, the correction data reading unit 13 may read the correction data, and the road map data may be corrected based on the correction data.

Further, by designating the map number of the road map including the corrected portion, a function for reading the road map data corresponding to the number is added to the vehicle-mounted navigation device 1, and the read road is read. You may make it a structure which corrects map data. With this configuration, for example, the road map can be corrected before departure.

Besides, it is possible to make various design changes within the scope of the present invention.

[0040]

As described above, according to the road map correction data supply device of the present invention, since the correction data can be supplied to the vehicle-mounted navigation device by using the external storage medium storing only the correction data, the manufacturer can store the correction data. It is only necessary to manufacture an inexpensive external storage medium having a small capacity. Therefore, even if a road component or the like is newly installed in the future, the latest road map data including the road component or the like can be provided to the user quickly and inexpensively.

If the external storage medium is rented to the user, for example, for a fee, the user can obtain the correction data at a lower cost than the actual purchase, so that the financial burden is lighter. Become. Particularly, according to the configuration of the second aspect, it is possible to cope with various corrections and further reduce the data capacity of the correction data, so that it is possible to provide an even cheaper external storage medium.

Further, according to the configuration of claim 4, the user can obtain the correction data by using the communication line network or the like without purchasing the external storage medium. Economic burden is reduced.

[Brief description of drawings]

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

FIG. 2 is a diagram for explaining a configuration of road map data stored in advance in a CD-ROM.

FIG. 3 is a diagram for explaining a configuration of road map data stored in advance in a CD-ROM.

FIG. 4 is a diagram illustrating a configuration of correction data stored in an external storage medium.

FIG. 5 is a diagram for explaining a configuration of correction data stored in an external storage medium according to the second embodiment of the present invention.

FIG. 6 is a block diagram showing a configuration of a navigation system according to a third embodiment of the present invention.

[Explanation of symbols]

 1 In-vehicle navigation device 2 Road map correction data supply device 3 Position detection unit 5 Map memory 9 Display unit 10 External storage medium 11 Correction data input device 12 Correction data storage unit 13 Correction data reading unit 30 Correction node number 31 Correction code 32 data 40 correction data analysis unit 41 correction data conversion unit 50 transmission / reception system for automobiles

Claims (4)

[Claims] 1. A map data storage means for storing road map data in advance, a map data expansion storage means for reading and temporarily storing road map data in a predetermined range stored in the map data storage means, and For supplying road map correction data to a vehicle-mounted navigation device having a display control means for displaying a road map on a display screen based on the road map data stored in the map data developing storage means. An apparatus, wherein the correction data includes at least a node number, an X coordinate, a Y coordinate, and an adjacent node number of a node corresponding to a correction point of a road, and an external storage medium in which only the correction data is stored in advance, A reading means for reading the correction data stored in the external storage medium, and a correction data for storing the correction data read by the reading means. And a correction means for reading the correction data stored in the correction data storage means and correcting the road map data stored in the map data expansion storage means based on the read correction data. A road map correction data supply device comprising: 2. The road map correction data supply device according to claim 1, wherein the external storage medium corresponds to a node number of a node corresponding to a road correction point, a correction code indicating a correction method, and a correction method. Correction data including at least the contents to be stored in advance, and recognition means for recognizing the correction method and contents corresponding to the correction code included in the correction data read by the correction means; and the recognition means for recognizing the correction method. Conversion means for converting the correction data into correction data including at least a node number, an X coordinate, a Y coordinate, and an adjacent node number of a node corresponding to a correction point of a road based on the corrected method and contents. A road map correction data supply device characterized in that 3. The road map correction data supply device according to claim 1 or 2, wherein the external storage medium is a cassette tape or a mini disk. Supply device. 4. The road map correction data supply device according to claim 1 or 2, wherein the external storage medium comprises a system for taking correction data into the vehicle from outside the vehicle via a communication network. A road map correction data supply device characterized in that