JP7011028B2 - Transmission device, terminal device, transmission method, transmission program, map data update method and map data update program - Google Patents

Description

The present invention relates to a transmission device, a terminal device, a transmission method, a transmission program, a map data update method, and a map data update program for transmitting map update data. However, the use of the present invention is not limited to the transmission device, the terminal device, the transmission method, the transmission program, the map data update method, and the map data update program.

Conventionally, regarding the update of map data, a technique has been disclosed in which a user's terminal device acquires a difference between the new map data and the old map data from the center and updates the old map data with the new map data (for example, the following patent). See Document 1).

Japanese Unexamined Patent Publication No. 2004-287705

In the above-mentioned conventional technique, if the difference update is permanently continued for the original map data stored in the terminal device, the difference amount becomes too large and the processing time for the difference update becomes long. There was something. In addition, for users who do not update the difference frequently, the difference data that needs to be updated accumulates, and the size of the difference data when updating exceeds the size of the original map data. One example is the problem of not being able to do this.

In order to solve the above-mentioned problems and achieve the object, the transmission device according to the invention of claim 1 has been changed as an acquisition means for acquiring version information of map data from a terminal device and as map update data. A recording means for recording the first update data for updating the data of the road that has not been changed in addition to the road and the second update data for updating the data of the road that has been changed, the version information, and the update data. It has a determination means for determining one of the first update data and the second update data by comparing with the version information corresponding to the above, and a transmission means for transmitting the determined update data. It is characterized by.

Further, the transmission device according to the invention of claim 4 is an acquisition means for acquiring version information of map data from a terminal device, and first update for updating all roads of the map data as map update data. The recording means for recording the data and the second update data for performing the differential update for the changed road among the roads in the map data, the version information, and the version information corresponding to the update data. By comparing, it is characterized by having a determination means for determining one of the first update data and the second update data, and a transmission means for transmitting the determined update data.

Further, in the terminal device according to the invention of claim 5, as map update data, in addition to the changed road, the first update data for updating the data of the unchanged road and the data of the changed road. The notification means for notifying the server in which the second update data to be updated is recorded with the version information of the map data to be updated, and the server compare the version information with the version information corresponding to the update data. The receiving means for receiving the updated data of any one of the first updated data and the second updated data, which is the updated data determined by the above, and the receiving means receiving the first updated data. When it is received, the map data to be updated is updated by updating the file using the first update data, and when the receiving means receives the second update data, the second update data is used. It is characterized by having an update means for updating the map data to be updated by updating the data of the binary difference.

Further, the transmission method according to the invention of claim 6 is the transmission method carried out by the transmission device, in which the acquisition step of acquiring the version information of the map data from the terminal device and the changed road as the update data of the map. In addition, the recording process of recording the first update data for updating the data of the road that has not been changed and the second update data for updating the data of the road that has been changed in the recording unit, the version information, and the update. It includes a determination step of determining one of the first update data and the second update data by comparing the version information corresponding to the data, and a transmission step of transmitting the determined update data. It is characterized by that.

Further, the transmission program according to the invention of claim 7 is characterized in that the computer executes the transmission method according to claim 6.

Further, in the map data updating method according to the invention of claim 8, in the map data updating method executed by the terminal device, as the map updating data, not only the changed road but also the unchanged road data is updated. A notification process for notifying the server in which the first update data and the second update data for updating the changed road data of the version information of the map data to be updated, and the above version by the server. Receiving the update data of any one of the first update data and the second update data, which is the update data determined by comparing the information with the version information corresponding to the update data. When the first update data is received in the step and the reception step, the map data to be updated is updated by file update using the first update data, and the second update data is updated in the reception step. Is received, it is characterized by including an update step of updating the map data to be updated by updating the data of the binary difference using the second update data.

Further, the map data update program according to the invention of claim 9 is characterized in that the computer executes the map data update method according to claim 8.

FIG. 1 is a block diagram showing an example of a functional configuration of a transmission device according to an embodiment. FIG. 2 is a flowchart showing an example of a processing procedure of the transmission device according to the embodiment. FIG. 3 is a block diagram showing an example of the hardware configuration of the navigation device according to the embodiment of the transmission device. FIG. 4 is a diagram showing an example of map data held by the server according to the embodiment. FIG. 5 is a flowchart showing an example of map data update processing according to an embodiment. FIG. 6 is a diagram illustrating an example of updating map data according to an embodiment. (Part 1) FIG. 7 is a diagram illustrating an example of updating map data according to an embodiment. (Part 2)

(Embodiment)
Hereinafter, preferred embodiments of the transmission device, the terminal device, the transmission method, the transmission program, the map data update method, and the map data update program according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram showing an example of a functional configuration of a transmission device according to an embodiment. The transmission device 100 is, for example, a server connected to an external terminal device via a network or the like. The terminal device stores and holds the map data, and the transmission device 100 determines the map data necessary for updating to the terminal device and transmits the map data to the terminal device.

The transmission device 100 includes an acquisition unit 101, a recording unit 102, a determination unit 103, and a transmission unit 104.

The acquisition unit 101 acquires version information of the map data held by the terminal device from the terminal device. For example, the acquisition unit 101 acquires the version information of the map data from the terminal device when the terminal device requests to update the map data.

The recording unit 102 stores and holds updatable map data that changes with the passage of time. The map data can be, for example, a communication connection with an external device externally connected to the transmission device, a connector connection of a recording medium such as a memory (USB memory) for recording update data, or an operation unit by an operator or the like. It is updated by operation input via.

The recording unit 102 records and holds the first update data and the second update data as the latest update data, respectively. The first update data is the data obtained by updating the data of the roads that have not been changed in addition to the roads that have been changed. For example, it corresponds to the data content when all the map data is updated. The second update data is data for updating the data of the changed road. Both the first update data and the second update data are the latest update data, and by using the first update data or the second update data, the map data of the terminal device becomes the latest map data. Further, as will be described later, either the first update data or the second update data is transmitted to the terminal device according to the version information of the map data of the terminal device.

The first update data and the second update data, which are the latest update data, hold the same version information. This version information includes first version information called a generation version that counts up by the first update described later, and second version information called a monthly version that counts up by the second update described later. Specifically, the version information is represented by a numerical value such as "1.0", and the part before the decimal point is the first version information and the part after the decimal point is the second version information. If there is a first update, which will be described later, the first version information is counted up to "2.0". After that, if there is a second update described later, the second version information is counted up and set to "2.1".

The recording unit 102 periodically updates and stores the first update data and the second update data. The first updated data is, for example, large data that is updated once every six months and has a large amount of differential data. Further, the recording unit 102 records the first update data including the update of the map data every month, which will be described later, every month.

The recording unit 102 updates (first update) the first update data including the data of the road that has not been changed (data for the previous update) in addition to the road that has been changed since the last update. When this first update occurs, the value (version number) of the first version information (generation version) is counted up.

The second update data is, for example, small data that is updated monthly and has a small difference data amount.

Regarding the second update data, the recording unit 102 counts up the value (version number) of the second version information (monthly version) when the second update that updates the data of the changed road occurs.

The determination unit 103 compares the version information of the map data of the terminal device acquired by the acquisition unit 101 with the version information corresponding to the update data recorded by the recording unit 102. Then, it is determined whether the update data to be transmitted to the terminal is the first update data or the second update data.

Here, when the terminal device requests to update the map data, the acquisition unit 101 acquires at least the first version information from the terminal device as the version information of the map data of the terminal device, and the determination unit 103. Output to.

Then, the determination unit 103 compares the current first version information of the terminal device (the generation version with the latest first version information recorded and held by the recording unit 102 of the transmission device 100.

Then, as a result of comparison, when the value of the first version information of the latest map data of the transmission device 100 is larger than the current first version information of the terminal device, the determination unit 103 updates the first update data. Determined as data.

On the other hand, the value of the current first version information of the terminal device and the value of the first version information of the latest map data of the transmission device 100 are the same, and the latest of the transmission device 100 is higher than the current second version information of the terminal device. If the value of the second version of the map data is larger, the second update data is determined as the update data.

The transmission unit 104 transmits the update data (first update data or second update data) determined by the determination unit 103 to the terminal device.

FIG. 2 is a flowchart showing an example of a processing procedure of the transmission device according to the embodiment. First, the transmission device 100 acquires the version information of the map data held by the terminal device from the terminal device (step S201). The acquisition timing is performed, for example, when there is a request for updating the map data from the terminal device. At this time, the acquisition unit 101 acquires at least the first version information from the terminal device as the version information of the map data recorded by the terminal device.

Next, the transmission device 100 compares the version information of the map data of the terminal device with the version information corresponding to the update data recorded by the recording unit 102 of the transmission device 100 by the determination unit 103 (step S202). .. At this time, the determination unit 103 compares the value of the current first version information (generation version) of the terminal device with the value of the latest first version information recorded and held by the recording unit 102 of the transmission device 100. ..

Then, as a result of comparison, when the value of the first version information of the latest map data of the transmission device 100 is larger than that of the current first version information of the terminal device, the determination unit 103 determines (step S203: Yes). The first update data at the present time is determined as the update data (step S204).

On the other hand, the value of the current first version information of the terminal device and the value of the first version information of the latest map data of the transmission device 100 are the same, and the latest of the transmission device 100 is higher than the current second version information of the terminal device. If the value of the second version of the map data is larger (step S203: No), the second update data at the present time is determined as the update data (step S205).

After that, the transmission unit 104 transmits the update data (first update data or the second update data) determined by the determination unit 103 to the terminal device (step S206), and ends the process.

According to the embodiment described above, the transmitting device acquires the current version information of the terminal device, and automatically changes the update method and the update data format according to the difference amount of data required by the terminal device. As a result, it becomes possible to perform differential update with the optimum update method and update data size for the terminal device. In addition, by using the version operation to determine the update method and update data format, the optimum update can be obtained only by acquiring the version of the terminal device without constantly managing the difference amount of the terminal device on the transmitting device side. You will be able to determine the method and update data format.

As a result, the terminal device can update the data with the optimum amount of data, and at the same time, the update data transmitted from the transmitting device to the terminal device can be updated with the minimum amount of data. In any of the data transmission devices, data update can be performed efficiently and the data processing load and communication load can be minimized.

Next, examples of the present invention will be described. In the embodiment, the navigation device 300 is mounted on the user's vehicle and is connected to the server by communication. The navigation device 300 records and holds the map data so that it can be updated, makes an acquisition request to the server at the time of updating, and downloads the map data from the server. Then, an example of the case where the server executes the function of the transmission device 100 and the navigation device 300 executes the function of the terminal device will be described.

(Hardware configuration of navigation device 300)
FIG. 3 is a block diagram showing an example of the hardware configuration of the navigation device according to the embodiment of the transmission device. In FIG. 3, the navigation device 300 includes a CPU 301, a ROM 302, a RAM 303, a magnetic disk drive 304, a magnetic disk 305, an optical disk drive 306, an optical disk 307, an audio I / F (interface) 308, a microphone 309, a speaker 310, and an input device 311. It is equipped with a video I / F 312, a display 313, a communication I / F 314, a GPS unit 315, various sensors 316, and a camera 317. Each component 301 to 317 is connected by a bus 320.

The CPU 301 controls the entire navigation device 300. The ROM 302 records a boot program and a shooting program. The RAM 303 is used as a work area of the CPU 301. That is, the CPU 301 controls the entire navigation device 300 by executing various programs recorded in the ROM 302 while using the RAM 303 as a work area.

The magnetic disk drive 304 controls reading / writing of data to the magnetic disk 305 according to the control of the CPU 301. The magnetic disk 305 records the data written under the control of the magnetic disk drive 304. As the magnetic disk 305, for example, HD (hard disk) or FD (flexible disk) can be used.

Further, the optical disk drive 306 controls reading / writing of data to the optical disk 307 according to the control of the CPU 301. The optical disc 307 is a detachable recording medium from which data is read out under the control of the optical disc drive 306. The optical disc 307 can also use a writable recording medium. As the removable recording medium, in addition to the optical disk 307, an MO, a memory card, or the like can be used.

Examples of the information recorded on the magnetic disk 305 and the optical disk 307 include map data, vehicle information, road information, travel history, and the like. Map data is used when searching for routes in car navigation systems, and background data that represents features such as buildings, rivers, ground surfaces, and energy supply facilities, and road shapes that represent road shapes with links and nodes. Vector data including data.

The map data also includes version information. This version information is version information including the above-mentioned first version information (generation version) and second version information (monthly version).

The voice I / F 308 is connected to a microphone 309 for voice input and a speaker 310 for voice output. The voice received by the microphone 309 is A / D converted in the voice I / F 308. The microphones 309 are installed, for example, on the dashboard of a vehicle, and the number of microphones 309 may be singular or plural. From the speaker 310, a voice obtained by D / A-converting a predetermined voice signal in the voice I / F 308 is output.

Examples of the input device 311 include a remote controller, a keyboard, and a touch panel having a plurality of keys for inputting characters, numerical values, various instructions, and the like. The input device 311 may be realized by any one form of the remote controller, the keyboard, and the touch panel, but it can also be realized by a plurality of forms.

The video I / F 312 is connected to the display 313. Specifically, the video I / F 312 is output from a graphic controller that controls the entire display 313, a buffer memory such as VRAM (Video RAM) that temporarily records image information that can be displayed immediately, and a graphic controller. It is configured by a control IC or the like that controls the display 313 based on the image data to be generated.

The display 313 displays various data such as icons, cursors, menus, windows, characters and images. As the display 313, for example, a TFT liquid crystal display, an organic EL display, or the like can be used.

The camera 317 captures an image including the road outside the vehicle. The image may be either a still image or a moving image. For example, the outside of the vehicle is photographed by the camera 317, the photographed image is image-analyzed by the CPU 301, or a recording medium such as a magnetic disk 305 or an optical disk 307 is analyzed via the image I / F 312. Output to.

The communication I / F 314 is wirelessly connected to the network and functions as an interface between the navigation device 300 and the CPU 301. Communication networks that function as networks include in-vehicle communication networks such as CAN and LIN (Local Interconnect Network), public line networks, mobile phone networks, DSRC (Dedicated Short Range Communication), LAN, and WAN. The communication I / F 314 is, for example, a connection module for a public line, an ETC (non-stop automatic toll collection system, registered trademark) unit, an FM tuner, a VICS (registered trademark) / beacon receiver, and the like.

Using this communication I / F 314, communication with a server described later is performed, and version information of map data recorded on the magnetic disk 305 and the optical disk 307 is transmitted to the server.

The GPS unit 315 receives radio waves from GPS satellites and outputs information indicating the current position of the vehicle. The output information of the GPS unit 315 is used in calculating the current position of the vehicle by the CPU 301 together with the output values of various sensors 316 described later. The information indicating the current position is information that identifies one point on the map data, such as latitude / longitude and altitude.

The various sensors 316 output information for determining the position and behavior of the vehicle, such as a vehicle speed sensor, an acceleration sensor, an angular velocity sensor, and an inclination sensor. The output values of the various sensors 316 are used by the CPU 301 to calculate the current position of the vehicle and the amount of change in speed and direction.

(Server configuration example)
The server used as the transmission device shown in FIG. 1 has the same configuration as that of FIG. In this server, the GPS unit 315, various sensors 316, the camera 317, etc. shown in FIG. 3 are unnecessary. In the transmission device 100 shown in FIG. 1, the CPU 301 executes a predetermined program by using the programs and data recorded in the ROM 302, the RAM 303, the magnetic disk 305, the optical disk 307, and the like shown in FIG. The function of the determination unit 103 is realized. Further, the functions of the acquisition unit 101 and the transmission unit 104 of FIG. 1 can be realized by using the communication I / F 314 of FIG. Further, the function of the recording unit 102 of FIG. 1 can be realized by using the magnetic disk 305 of FIG. 3, the optical disk 307, or the like.

(About map data used for updating)
FIG. 4 is a diagram showing an example of map data held by the server according to the embodiment. Next, the management state of the map update data held by the server of the transmission device 100 will be described. FIG. 4 shows the above-mentioned first update data V1 and the second update data V2.

The first update data V1 is updated every six months (after November 2016, then May 2017), and the contents of the map data are significantly changed compared to the first update data V1 at the time of the previous update. To. Further, in the illustrated example, the first update data V1 is updated every two months to include the update every two months. In the example shown in the figure, the second update data V2 is updated every two months (updated in September 2016 after July 2016), and the contents of the map data are changed compared to the first update data V1. Small (less).

As shown in the figure, the server holds the first update data V1 and the second update data V2 available to the terminal device (navigation device 300) every odd month.

In FIG. 4, "large" indicates that the difference is large, and "small" indicates that the difference is small. The "small" update data holds the difference from the previous update data, that is, the difference data of the portion changed with respect to the previous update data as a binary difference (the amount of data is, for example, 100 MByte). The "large" update data is held in file units, including all the data from the time of shipment of the map data as a product (the amount of data is, for example, 2 Gbyte).

Looking at the example of FIG. 4, for example, when the user of the navigation device 300 updates the map data recorded and held by the navigation device 300 released in May 2016 in September 2016. Will be explained. In this case, the determination unit 103 (CPU301) of the server determines that the amount of change in the data is smaller than that of the previous data (at the time of purchase), and the difference between July and September 2016 is "small". The second update data V2 is downloaded to the navigation device 300, and the map data is updated by the navigation device 300.

Also, if a user who also purchased in May 2016 updates the data in September 2017, the server determines that the amount of change in the data will be large, and the difference in September 2017 is "Large". The first update data V1 of the above is downloaded to the navigation device 300. In this way, the server determines whether the required update data is the first update data V1 or the second update data V2 according to the amount of change in the data required when updating the navigation device 300, and appropriately updates the data. The data is downloaded to the navigation device 300.

In this way, the server switches to updating using the "large" file according to the update time in order to prevent the update time from becoming too long if the number of updates of the "small" binary difference becomes too large, and the result is We are trying to shorten the data update time.

As described above, the reason why the first update data V1 with the difference "large" is performed once every six months is, for example, for the following reason.
1. 1. Because the ID of the existing road link is changed to match the consistency with the added road link ID.
2. 2. Since the original data is extensively prepared once every six months, various IDs after editing will change before and after the maintenance. For example, when one road is added, the existing road link ID is also changed in order to maintain its consistency. Further, as the existing road link ID changes, it is necessary to ensure the consistency of various data associated with the existing road link ID.

(Example of map data update process)
FIG. 5 is a flowchart showing an example of map data update processing according to an embodiment. In the following processes, steps S501 to S506 are processes performed by the server, and steps S507 to S512 are processes performed by the navigation device 300. In both the server and the navigation device 300, the CPU executes the following processing.

First, the navigation device (referred to as navigation) 300 uploads (uploads) the version information of the current map data to the server when the map data is updated (step S501). At this time, the navigation 300 notifies the server of the version information including the first version information (generation version) and the second version information (monthly version).

Then, the server compares the version information of the data (updated data) currently held by the server with the version information of the data of the navigation 300 (step S502). At this time, at least, the server compares the first version information (generation version).

Next, the server determines whether the first version information (generation version) of the data (updated data) held by the server is larger (new) than the first version information (generation version) of the navigation 300 (step S503). ). If the first version information (generation version) of the server is larger than the first version information (generation version) of the data of the navigation 300 (step S503: Yes), the server transfers the data having a "large" difference to the navigation 300. Download (step S504) and proceed to step S507.

On the other hand, if the first version information (generation version) of the server is equal to or smaller (older) than the first version information (generation version) of the navigation 300 (step S503: No), the server is the first version information of the server (step S503: No). It is determined whether the generation version) is equal to the first version information (generation version) of the navigation 300 and the second version information (monthly version) of the server is larger than the second version information (monthly version) of the navigation 300 (step S505). ).

Here, the first version information (generation version) of the server is equal to the first version information (generation version) of the navigation 300, and the second version information (monthly version) of the server is the second version information (monthly version) of the navigation 300. If it is larger than (step S505: Yes), the server downloads the data of the difference "small" to the navigation 300 (step S506), and proceeds to step S507.

On the other hand, the first version information (generation version) of the server is equal to the first version information (generation version) of the navigation 300, and the second version information (monthly version) of the server is smaller than the second version information (monthly version) of the navigation 300. In that case (step S505: No), the process proceeds to step S512 without downloading the data to the navigation 300.

In step S507, the navigation 300 compares the version of the current map data on the navigation side with the version of the downloaded update data (step S507). After that, if the downloaded generation version is larger than the version of the navigation 300 (step S508: Yes), the navigation 300 navigates the file of the downloaded update data (first update data V1, generation version). It is replaced with the file in (step S509), and the process is terminated.

On the other hand, if the downloaded first version information (generation version) is equal to or smaller than the first version information (generation version) of the navigation 300 (step S508: No), the navigation 300 proceeds to step S510.

In step S510, in the navigation 300, the downloaded data and the first version information (generation version) of the current map data of the navigation 300 are equal to each other, and the second version information (monthly version) of the downloaded update data is obtained. It is determined whether the navigation 300 is larger than the current second version information (monthly version) (step S510). Then, the downloaded data and the first version information (generation version) of the current map data of the navigation 300 are equal, and the second version information (monthly version) of the downloaded update data is the current second version of the navigation 300. If it is larger than the information (monthly version) (step S510: Yes), the navigation 300 uses the downloaded update data (second update data V2) to perform a binary difference update to the current map data (step S511). ..

The data downloaded in step S510 and the first version information (generation version) of the current map data of the navigation 300 are equal to each other, and the second version information (monthly version) of the downloaded update data is the current first version of the navigation 300. If it is smaller than the two version information (monthly version) (step S510: No), the map data is not updated because there is no target difference data (update data) this time (step S512).

As shown in the above process, the data and update method are changed according to the amount of change in the data from the previous update when the map data is updated. If the difference is "Large", the data is replaced for each file and the difference is In the case of "small", the binary differential update enables efficient data update according to the amount of data at the time of update. However, the update data and update method are not limited to the above file update and binary differential update.

(Example of updating map data)
6 and 7 are diagrams showing an example of updating the map data according to the embodiment, respectively. According to the processing example of FIG. 5, first, the map data update example 1 (case 1) will be described with reference to FIG. In this update example 1, the case where the user of the navigation device 300 updates the map data recorded and held by the navigation device 300 released in May 2016 will be described.

In this case, the determination unit 103 (CPU301) of the server determines that the amount of change in the data is smaller than that of the previous data (at the time of purchase), and the difference between July and September 2016 is "small". The second update data V2 is downloaded to the navigation device 300, and the map data is updated by the navigation device 300.

Then, the navigation device 300 updates the data with the binary difference based on the second update data V2 of the difference "small" in July 2016, and then the binary based on the second update data V2 of the difference "small" in September 2016. Data is updated by the difference.

Next, update example 2 (case 2) of map data will be described with reference to FIG. 7. In this update example 2, the case where the user of the navigation device 300 updates the map data recorded and held by the navigation device 300 released in May 2016 will be described.

In this case, the determination unit 103 (CPU301) of the server determines that the amount of change in the data is larger than that of the previous data (at the time of purchase), and first updates the difference "large" in September 2017. The data V1 is downloaded to the navigation device 300, and the map data is updated by the navigation device 300.

Then, the navigation device 300 updates the data by updating the file based on the first update data V1 of the difference "large" in September 2017.

The difference data "Large" for September 2017 is the difference data "Large" for May 2017, the difference data "Small" for July 2017, and the difference data "Small" for September 2017. It is the data that reflects.

Such difference data "large" is prepared every time the map data is updated on the server. Then, as in the update example 2 of FIG. 7, a user who has not updated the map for a long time (even in the navigation device 300, the map data can be updated by one update operation.

By downloading the difference data "Large" in September 2017 or the difference data "Small" in September 2017, the map data used by the user will be the same, so the same version information will be assigned to each. ..

According to the above-described embodiment, the server acquires the version information of the current map data of the navigation device, and whether the data required for updating the map data of the navigation device is the first update data having a large difference amount. Alternatively, it is determined whether the second update data has a small amount of differential data. As a result, the server can send (download) update data corresponding to the amount of difference data required by the navigation device to the navigation device.

As a result, the navigation device does not need to permanently update the difference with respect to the original map data stored in the memory. For example, the difference amount becomes large after a lapse of time from the previous update, and the difference update process is performed. It is possible to prevent the time from becoming long. In this way, for users who do not frequently perform differential updates, if the differential data that needs to be updated accumulates, the size of the differential data when updating may exceed the size of the original map data. According to the embodiment, when the time elapses, the file is updated using the first update data having a large difference amount, so that the map data can be updated efficiently.

Further, in the embodiment, the navigation device is used as the terminal device for updating the map data, but the same can be applied to a terminal device such as a smartphone or a tablet that holds the map data.

The method described in this embodiment can be realized by executing a program prepared in advance on a computer such as a personal computer or a workstation. This program is recorded on a computer-readable recording medium such as a hard disk, flexible disk, CD-ROM, MO, or DVD, and is executed by being read from the recording medium by the computer. Further, this program may be a transmission medium that can be distributed via a network such as the Internet.

100 Transmitter 101 Acquisition unit 102 Recording unit 103 Determination unit 104 Transmitter unit 300 Navigation device

Claims (9)

An acquisition method for acquiring map data version information from a terminal device,
As the map update data, a recording means for recording the first update data for updating the data of the road that has not been changed in addition to the road that has been changed, and the second update data that updates the data of the road that has been changed. When,
A determination means for determining either the first update data or the second update data by comparing the version information with the version information corresponding to the update data.
A transmission means for transmitting the determined update data, and
A transmitter characterized by having. The recording means is a number that is counted up when the first update occurs to update the data of the road that has not been changed in addition to the road that has been changed as the version information of the update data. When,
The transmission according to claim 1, wherein the second version information, which is a number counted up when the second update occurs to update the data of the changed road, and the version information including the second version information are recorded. Device. The determination means compares the first version information acquired by the acquisition means with the first version information of the latest map data, and if the first version information of the latest map data is larger, the first version information is described. 1 Update data is determined as update data, the first version information is the same, and the second version information acquired by the acquisition means is compared with the second version information of the latest map data. The transmission device according to claim 2, wherein when the latest second version information is larger, the second update data is determined as update data. An acquisition method for acquiring map data version information from a terminal device,
As the map update data, the first update data for performing a complete update of the road in the map data and the second update data for performing a differential update for the changed road among the roads in the map data are used. Recording means to record and
A determination means for determining either the first update data or the second update data by comparing the version information with the version information corresponding to the update data.
A transmission means for transmitting the determined update data, and
A transmitter characterized by having. As map update data, a server that records the first update data that updates the data of roads that have not changed in addition to the roads that have changed, and the second update data that updates the data of roads that have changed. As a notification means for notifying the version information of the map data to be updated,
One of the first update data and the second update data, which is the update data determined by comparing the version information with the version information corresponding to the update data by the server. Receiving means to receive update data and
When the receiving means receives the first update data, the map data to be updated is updated by file update using the first update data, and the receiving means receives the second update data. In addition, the update means for updating the map data to be updated by updating the data of the binary difference using the second update data, and
A terminal device characterized by having. In the transmission method carried out by the transmission device
The acquisition process to acquire the version information of map data from the terminal device,
As the map update data, the first update data that updates the data of the road that has not changed in addition to the road that has changed, and the second update data that updates the data of the road that has changed are recorded in the recording unit. Recording process and
A determination step of determining either the first update data or the second update data by comparing the version information with the version information corresponding to the update data.
The transmission step of transmitting the determined update data and
A transmission method characterized by including. A transmission program comprising causing a computer to execute the transmission method according to claim 6. In the map data update method executed by the terminal device
As map update data, a server that records the first update data that updates the data of roads that have not changed in addition to the roads that have changed, and the second update data that updates the data of roads that have changed. In response to the notification process that notifies the version information of the map data to be updated,
The server is one of the first update data and the second update data, which is the update data determined by comparing the version information with the version information corresponding to the update data. The receiving process to receive the update data and
When the first update data is received in the reception step, the map data to be updated is updated by file update using the first update data, and the second update data is received in the reception step. In that case, the update process of updating the map data to be updated by updating the binary difference data using the second update data, and the update process.
A map data update method characterized by including. A map data update program comprising causing a computer to execute the map data update method according to claim 8.

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