JP2002372423A - Map data displaying system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a map data displaying system wherein capacity of a storage device necessary for a terminal can be reduced. SOLUTION: In this map data displaying system, a communication satellite 10 wherein a service providing area to a receiving terminal 30 is included in an available area of distribution is used, and center equipment 20 is installed which is provided with data accumulating equipment 21 for accumulating a large amount of map data which are related with different geographical position information, and transmitting equipment 22 which transmits repeatedly all of the map data accumulated in the data accumulating equipment 21 to the communication satellite 10. In the receiving terminal 30, a receiving device 33 for receiving a radio signal from the communication satellite 10, and a storage device 34 which stores map data corresponding to at least self position information out of received map data, as map data to be displayed on a display device 32 are installed, so that it is unnecessary that a large amount of the map data are accumulated in the receiving terminal side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a map data display system for displaying map data on a display device of a mobile terminal movable with a user, particularly, map data near a position where the user himself is present.

[0002]

2. Description of the Related Art Hitherto, as this type of system, a navigation device mounted on an automobile or the like has been known.

FIG. 1 shows an outline of a conventional navigation device, which is a GPS (Global Positionion).
ng System), a GPS device 1 that obtains its own geographical position information, here, longitude and latitude, and a storage device 2 that stores a large number of map data associated with the position information. And a display device 3 for displaying map data, and a control device 4.
The map data corresponding to the longitude and latitude of the device obtained by the PS device 1 is read from the storage device 2 and displayed on the display device 3.

[0004]

However, in the case of such a navigation device, the storage device 2 stores all map data covering the service providing area of the device, for example, the map data for all over Japan in a device for Japan. In such a case, there is a problem that the storage capacity required for the storage device 2 increases. Further, since the map data once stored in the storage device 2 is not changed, it is impossible to display in real time a change in the road condition that occurs at any time such as traffic congestion or construction.

An object of the present invention is to provide a map data display system capable of reducing the capacity of a storage device required for a terminal.

Another object of the present invention is to provide a map data display system capable of updating map data to be displayed in real time.

[0007]

According to the present invention, in order to achieve the above object, a user is present on a display device of a mobile terminal which can move with the user and can always acquire his / her geographical position information. In a map data display system for displaying map data including a position, a communication satellite including a service providing area for a mobile terminal in a distributable area is used, and a large number of map data associated with different geographical position information is stored. A center device comprising a data storage means and a transmission means for repeatedly transmitting all map data stored in the data storage means to the communication satellite,
A mobile terminal, receiving means for receiving a radio signal from a communication satellite, and map data received by the radio signal,
A storage unit for storing at least map data corresponding to the own location information as map data to be displayed on a display device.

[0008] According to the above configuration, the mobile terminal only needs to store the map data corresponding to the user's own location, and the required capacity of the storage device can be reduced.

Here, it is assumed that the map data stored in the data storage means includes map data associated with the same geographical position information and having different attribute information such as a scale factor and a type of written information. For example, in addition to map data depicting ordinary roads, buildings, etc., map data of different scales, with traffic congestion information, with traffic regulation information, with road construction information, with information on non-access points, addition of restaurants etc. It is possible to display map data or the like with information.

[0010] The communication satellite distributes all map data using radio waves of the same frequency, but distributes map data for each predetermined area using radio waves of different frequencies. May be.

[0011] Further, the mobile terminal is provided with a means for periodically repeating the reception of the radio signal by the receiving means and updating the map data stored in the storage means. And the map data to be displayed can be updated in real time.

Further, the center device is provided with a means for updating the contents of the map data stored in the data storage means as needed, so that the map data including the latest information is always transmitted via the communication satellite to the mobile terminal. And display it.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 2 shows an example of an embodiment of the present map data display system. In the figure, reference numeral 10 denotes a communication satellite;
Is a center device, and 30 is a receiving terminal (mobile terminal).

The communication satellite 10 includes a service providing area for the receiving terminal 30, for example, the whole of Japan as a distributable area. When the entire distributable area is covered by one frequency band, the same map data is used for all areas. When a different frequency is covered for each of the areas (areas) A, B, C,..., It is determined which map data is to be transmitted to which area based on the attribute information added to the map data. Send.

FIG. 3 shows the detailed configuration of the center device 20 together with the receiving terminal 30. The center device 20 includes a data storage device 21 for storing a large number of map data associated with different geographical position information, A transmitting device 22 for repeatedly transmitting all map data stored in the storage device 21 to the communication satellite 10 by radio signals, reading map data from the data storage device 21 and transferring it to the transmitting device 22, or And a control device 23 for updating the map data.

FIG. 4 shows the details of the map data, for example, 40, stored in the data storage device 21. The map data body 41 on which roads, buildings, and the like are drawn has center position information (here, longitude). And latitude) 42, area type (Hokkaido, Tohoku, ...), and scale (1/5000, 1/10000, ...)
…), And attribute information 43 including the type of the described information (only map data, with traffic congestion information, with traffic regulation information, with road construction information, with no traffic information, with additional information such as restaurants, etc.) are added. It is configured.

Here, even if the center position information 42 is the same, the attribute information 43 is different (of course, the map data body 41 is also different), for example, the map data 40, for example, the map data 40 having different scales, and the type of the description information is different. The map data 40 is stored as separate map data 40, respectively. After all,
The data storage device 21 stores map data 40 having different center position information or attribute information for all of Japan.

The receiving terminal 30, as shown in FIG.
S device 31, display device 32, receiving device 33 for receiving a radio signal from communication satellite 10, storage device 34 for storing map data to be displayed on display device 32, receiving device 3
3 stores the map data corresponding to the position information at that time among the map data received in 3 in the storage device 34, and the control device 35 for displaying the map data on the display device 32 according to the operation of the user. Has become. The GPS device 31 and the display device 32 are the same as those of the conventional navigation device.

FIG. 6 shows the details of the control device of the receiving terminal. A position specifying memory 351 for storing the latest position information obtained by the GPS device 31, a position memory 352 for storing the immediately preceding position information, A receiving buffer 353 for temporarily storing the map data received by the receiving device 33 and a processing device 354 for controlling these are provided.

FIG. 7 shows the flow of processing in the processing device. FIG. 7A shows processing relating to position information, and FIG. 7B shows processing relating to map data.

Hereinafter, the operation of the present system will be described.

As described above, the center device 20 transmits the map data stored in the data storage device 21 to the transmission device 2.
2 repeatedly transmits a radio signal to the communication satellite 10, and the communication satellite 10 broadcasts the map data to the receiving terminal 30 in the service providing area every time the map data is received.

On the other hand, in the receiving terminal 30, the processing device 3
54 causes the GPS device 31 to always receive the position specifying signal from the GPS, specifies (acquires) the latest position information of the receiving terminal 30, and writes it in the position specifying memory 351. Further, the processing device 354 checks the contents of the position specifying memory 351 and the contents of the position memory 352, and if they do not match, writes the position information in the position specifying memory 351 to the position memory 352 to update the contents.

Further, the processing device 354 causes the receiving device 33 to always receive the map data by the radio signal from the communication satellite 10 and sequentially writes the map data in the receiving buffer 353. Further, every time map data is written to the reception buffer 353, the processing device 354 reads out the scale of the center position information and the attribute information added to the map data, and stores the position information (longitude and latitude) in the position memory 352. Then, it is determined whether or not the receiving terminal 30 exists in the area of the map data, and if so, the map data having the same attribute information in the storage device 34 is updated with the newly received map data. Thus, the storage device 34 always stores only the latest map data corresponding to the position information and having different attribute information.

If they do not match, the map data is left in the reception buffer 353 and overwritten with the next received map data.

When the user instructs the control device 35 of the receiving terminal 30 to display which attribute information includes a map, the processing device 354 stores the corresponding map data in the storage device 3.
4 and transferred to the display device 32 together with a mark indicating the position of the receiving terminal and displayed. Note that an instruction from the user can be transmitted to the processing device by, for example, clicking an icon on a display screen, and this mechanism can be realized by a technology realized by a conventional navigation device.

FIG. 8 shows a mechanism for updating the contents of map data stored in the data storage device at any time, for example, reflecting information such as traffic congestion on the map data in real time. Generally, a map 50 of a city unit such as Tokyo or Osaka is used.
Is displayed on a computer display, and information such as traffic congestion points, construction points, and traffic restriction points is added to the screen using a touch pen or a mouse. By dividing the city unit map 50 into unit map maps 51 to be stored by the center device 20, map data having additional information corresponding to various attributes can be prepared. Since this additional information always occurs,
The map creator constantly receives traffic information, construction work from the road manager, and regulatory information, performs work for creating map data, and stores the work in the data storage device 21 so that the map data in the data storage device 21 can be stored. Can be updated.

[0029]

As described above, according to the present invention,
In the mobile terminal, only the map data corresponding to the position where the user himself is stored needs to be stored in the storage device, and therefore, the storage capacity of the storage device can be greatly reduced as compared with the related art. For this reason, it is also possible to configure a terminal by adding a satellite radio wave reception function to a mobile phone having a GPS device.

Since the map data stored in the storage device is constantly updated, the latest map data, for example, map data including traffic congestion information, construction information, regulation information, new road information, etc. can be displayed in real time. .

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an outline of a conventional navigation device.

FIG. 2 is a configuration diagram showing an example of an embodiment of a map data display system according to the present invention.

FIG. 3 is a configuration diagram showing a detailed configuration of a center device.

FIG. 4 is an explanatory diagram showing details of map data.

FIG. 5 is a configuration diagram showing a detailed configuration of a receiving terminal.

FIG. 6 is a configuration diagram showing details of a control device of the receiving terminal.

FIG. 7 is a flowchart of processing in the processing device of the receiving terminal.

FIG. 8 is an explanatory diagram of a mechanism for updating map data in a data storage device.

[Explanation of symbols]

10: communication satellite, 20: center device, 21: data storage device, 22: transmitting device, 23: control device, 30: receiving terminal (mobile terminal), 31: GPS device, 32: display device, 33: receiving device , 34: storage device, 35: control device, 40: map data, 41: map data body, 42:
Center position information, 43: attribute information.

Claims (6)

[Claims] 1. A map data display system which displays map data including a position where a user is present on a display device of a mobile terminal which can move with the user and can always acquire its own geographical position information. A data storage unit that stores a large number of map data associated with different geographical location information while using a communication satellite that includes a service provision area for the mobile terminal in the distribution area, and all maps stored in the data storage unit A center device having transmission means for repeatedly transmitting data to a communication satellite is installed, and a mobile terminal has a receiving means for receiving a radio signal from a communication satellite, and a map data received by the radio signal.
Storage means for storing at least map data corresponding to its own position information as map data to be displayed on a display device. 2. The map data display system according to claim 1, wherein the map data stored in the data storage means is associated with the same geographical position information, and includes an attribute including a scale factor, a type of description information, and the like. A map data display system wherein information includes different map data. 3. The map data display system according to claim 1, wherein the communication satellite distributes all map data using radio waves of the same frequency. 4. The map data display system according to claim 1, wherein the communication satellite distributes map data for each predetermined area using radio waves of different frequencies. 5. The map data display system according to claim 1, wherein the mobile terminal periodically repeats the reception of the radio signal by the reception unit, and updates the map data stored in the storage unit. A map data display system, comprising: 6. The map data display system according to claim 1, wherein the center device includes means for updating the contents of the map data stored in the data storage means as needed. Data display system.