JPH11295084A - Map transmitting and receiving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce congestion on a communication line, to detect a break of a communication, and to manage the version of a map as to the map data management system and map data transmission and reception system of map information service using a computer communication. SOLUTION: When the user tries to change the display position of a map by using a map movement indicating means 205 in a data display terminal 200, information regarding the memory size of the map display terminal and sent map data which are written in a table in a terminal information storage means 105 in a map data management terminal 100 is read out and used. Consequently, the transmission of map data which are already present in a display memory 202 in the map data display terminal 200 is omitted and only map data which need to be sent newly are sent to reduce the amount of map data which are sent and received.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a map data management system and a map data transmission / reception system in a map information service using computer communication.

[0002]

2. Description of the Related Art Conventionally, a map transmitting / receiving apparatus has been disclosed in
One described in Japanese Patent No. 9039 is known. FIG.
0 illustrates the principle of a conventional map transmitting / receiving apparatus.
30, a display request command for a specific drawing is transmitted from the terminal having the display unit 5 to the host, and the application program 1 having received the command requests the map data from the common file 2 and the processing for display at the terminal is performed. In a map display system which converts the map data into terminal map data in a possible form and then transmits the map data to the terminal, a local file 4 for storing the map data for the terminal is provided, and the application program 1 receives a display request command. At first, it is inquired whether or not the terminal map data of the requested drawing is stored in the local file 4. When the terminal drawing data is stored, the terminal displays the specific drawing by using the terminal map data of the local file 4. Is transmitted.

[0003]

However, the above-mentioned conventional map transmitting / receiving apparatus has the following problems. (1) Problem of communication line congestion In a map transmitting / receiving apparatus in which a plurality of terminals are connected to a host, the communication lines are congested with a positive correlation with the number of terminals. In the above embodiment, if one terminal attempts to communicate with the host while another terminal is transmitting large-capacity map data with the host, the connection fails or the map data transfer ends. Wait until. Similar connection failures and long wait times also occur when many terminals attempt to communicate with the host almost simultaneously. (2) Problem of Communication Interruption When performing data communication using a telephone line regardless of whether it is wired or wireless, the quality of the line may deteriorate and communication may be interrupted. If the communication is interrupted while sending a large amount of map data from the host to the terminal, detect the interruption and inform that the same data needs to be sent and received again at the next connection, or send / receive If the communication is interrupted in the middle of the process, the data transmitted and received must be invalidated and deleted. If the processing for such a communication interruption is not performed, a map is displayed using incomplete data. The same occurs when the terminal user or the host administrator forcibly disconnects the communication. (3) Issues in map version control Map data is constantly changing. Therefore, the map of the same area, the same scale, the same subject, and the same purpose differs depending on the version of the map data. If version management is not performed for the host and terminal maps, the map data on the terminal side will not be updated because it is old, or it will be necessary to notify the terminal after updating the map data on the host side. Occurs.

[0004]

SUMMARY OF THE INVENTION In order to solve this problem, the present invention firstly provides a map data transmission / reception system comprising a map data management terminal, a map data display terminal, and a wired or wireless communication path. In the apparatus, the map data management terminal has terminal information storage means for storing terminal specification data relating to the map data display terminal and information relating to the map data, and the map data display terminal has a terminal ID of the map data display terminal and a map data display. Terminal specification storage means for recording information on the size of the display memory of the terminal, and before transmitting and receiving the map data between the map data management terminal and the map data display terminal, sending the terminal specification data from the map data display terminal, The data management terminal writes the received terminal specification data into the terminal information storage means, and sends the map data from the map data management terminal. When the map data is sent to the display terminal, information about the map data is written in the terminal information storage means, and thereafter, the display memory size written in the terminal information storage means and the information about the transmitted map data are read out. And changing the display position of the map.

[0005] Thus, the amount of map data to be transmitted and received can be reduced by omitting the transmission of the map data already existing in the display memory of the map data display terminal and transmitting only the map data that needs to be newly transmitted. Can be reduced.

Secondly, a terminal information storage means and a terminal specification storage means capable of storing a session number are provided, and when the map data management terminal and the map data display terminal transmit and receive the map data, the map data display is performed. When there is a request from the terminal, the map data management terminal updates the session number each time the map data management terminal answers the request, so that when there is a request from the map data display terminal, the map data management terminal The difference is detected by comparing the session number sent from the data display terminal with the session number stored in the table corresponding to the map data display terminal of the terminal information storage means.

[0007] This makes it possible to detect that communication has failed between the map data management terminal and the map data display terminal.

Third, in a map data transmitting / receiving apparatus including a map data management terminal, a map data display terminal, and a wired or wireless communication path, the map data display terminal has a terminal ID of the map data display terminal. It has a terminal specification storage means for recording information on the size of the display memory, and stores an area for storing map information relating to map data currently loaded on the display memory among map data sent to the map data display terminal. The map data display terminal has one or more map data information storage means. When the map data display terminal receives the map data from the map data management terminal, the map data display terminal writes the position in the display memory to the map data information storage means. When an attempt is made to change the display position, the position in the display memory written in the map data information storage means is read. .

[0009] Thus, by omitting the transmission request of the map data present in the display memory in the map data display terminal and transmitting the transmission request only for the map data that needs to be newly transmitted, the map to be transmitted and received can be transmitted. The amount of data can be reduced.

Fourthly, the map data display terminal is provided with a map data storage means for storing the map data received by the map data display terminal in advance, and a request for transmitting the map data already stored in the map data storage means is omitted. And transmitting a transmission request only for map data that needs to be newly transmitted.

[0011] This makes it possible to omit the transmission request of the map data already existing in the map data storage means in the map data display terminal and to transmit the transmission request only for the map data that needs to be newly transmitted. Thus, the amount of map data to be transmitted and received can be reduced.

Fifthly, when storing the map data, the map data identifier and the version number are written in the map data information storage means corresponding to the map data. When they are the same, the map data is transmitted only when the version number of the map data on the map data management terminal side is newer than the version number of the map data on the map data display terminal side.

Thus, the map data stored in the map data storage means of the map data display terminal can be replaced with a new version.

Sixth, map data is transmitted and received only when the version number of the map data is old.

Thus, the map data stored in the map data storage means of the map data display terminal can be returned to the previous version.

Seventh, there are a plurality of map data management terminals, and the spatial relationship between the map data stored in one map data management terminal and the map data stored in another map data management terminal is described. It is characterized in that it is stored in the map data management means.

When the display position is changed by the input means from the state in which the map data in the map data management terminal is displayed on the map data display terminal, the map of the corresponding area is displayed in the map data management terminal. Even when the data does not exist, by using the spatial relationship with the map data stored in other map data management terminals, the search for the corresponding map data can be performed from another map data management terminal. Searching also increases the probability of finding.

Eighth, the map data management means stores the relationship between the scales of the map data stored in the map data management terminal and the map data stored in the other map data management terminals. I do.

When the display position is changed by the input means while the map data in the map data management terminal is being displayed on the map data display terminal, the map of the corresponding scale is displayed in the map data management terminal. Even when data does not exist, by using the scale relationship with the map data stored in other map data management terminals,
The probability of finding the corresponding map data is increased by searching from another map data management terminal.

Ninth, search data storage means for storing search data for searching map data, relation record storage means for storing relation data including latitude and longitude coordinates for each search item, An index data management terminal having a data storage means and a search means for accessing the relational record storage means is provided. When searching map data, the search means searches the search data stored in the search data storage means. And extracting the relation data for the item corresponding to the search from the relation record storage means and searching the map data management terminal using the relation data as a search key.

Thus, the map data search terminal returns the result of the corresponding item to the map data display terminal, and the map data display terminal searches the map data management terminal again using the result as a key, thereby reducing search omissions. .

Tenth, by having the identifier of the map data management terminal in the relation data of the index data management terminal,
A corresponding map data management terminal is specified. This allows a quick search.

Eleventh, the present invention is characterized in that, by having an identifier of map data in the relation data of the index data management terminal, a search is performed in the corresponding map data management terminal. This allows for a quick search.

Twelfth, at least when the index data management terminal successfully searches for the map data management terminal,
A relation record storage unit for storing an identifier of the map data management terminal is provided.

As a result, the map data search speed is increased for the data once searched.

Thirteenth, at least when the index data management terminal successfully searches for the map data management terminal,
A relation record storage unit for storing an identifier of the map data management terminal and an identifier of the map data is provided.

As a result, the map data search speed is increased for the data once searched.

Fourteenth, when searching map data from the map data display terminal, the transfer order of the map data from the map data management terminal to the map data display terminal is determined according to the type of index data used by the index data management terminal. It is characterized by changing.

Thus, the user can first provide an outline of the target map data, and can determine whether the data is intended by the user even during the transfer of the map data.

[0030]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS.

(Embodiment 1) FIG. 1 shows a configuration of a map transmitting / receiving apparatus according to a first embodiment of the present invention. In FIG. 1, reference numeral 100 denotes a map data management terminal, 200 denotes a map data display terminal, and 300 denotes a cable. Or wireless communication path, 10
3 and 204, communication means for performing communication between the map data management terminal 100 and the map data display terminal 200 using the communication path 300; 101, map data management means for storing one or more types of maps in one or more files; 102 is a map data management means for searching, reading, and writing map data stored in the map data management means 101; 105, a terminal information storage means for storing information of the map data display terminal 200; Means 1
02, communication means 103, and terminal information storage means 105
A display screen 201 for displaying map data, a display memory 202 for writing map data, and a writing / drawing map data 203 for the display memory 202 or displaying the contents of a certain location on the display memory. A drawing unit 205 having a function of moving to another location on the memory; an input unit 205 for generating a map display request and a command for designating a display position by a user operation;
Reference numeral 07 denotes a terminal information storage unit that stores the terminal ID of the map data display terminal and the size of the display memory. Reference numeral 206 denotes a control unit that controls the drawing unit 203, the communication unit 204, the input unit 205, and the terminal specification storage unit 207. .

FIG. 2 is a diagram for explaining in detail the contents of the terminal specification storage means 207 according to the first embodiment of the present invention.
207a is a terminal ID, 207b is the size of the display memory, and indicates that the content of the size 207b of the display memory is composed of the number of pixels in the horizontal direction of the display memory and the number of pixels in the vertical direction of the display memory.

FIG. 3 is a diagram for explaining in detail the contents of the terminal information storage means 105 according to the first embodiment of the present invention.
105a indicates that the number of terminal information stored in the terminal information storage unit 105 is stored; 105b indicates that information of each map data display terminal connected to the map data management unit 100 is stored; 2, the contents of 105b are composed of the terminal ID of the terminal 2, the size of the display memory of the terminal 2, the map display position displayed on the terminal 2, and the management information of the map transferred to the terminal 2. To indicate that

FIG. 4 is a view for explaining the relationship between the contents of the terminal information storage means, map data, and the display memory according to the first embodiment of the present invention. Reference numeral 400 denotes JIS-one of the map management units. Secondary area defined by X410-1976 (hereinafter referred to as secondary mesh)
500 indicates an example in which the range of the map displayed by the map data display terminal 200 includes one or more secondary meshes, and 501, 502, 601, 602, 603, 6
FIG. 4 is a diagram showing the relationship between the map display position displayed on the terminal in FIG. 3 and the map management information transferred to the terminal, the actual map, and the display screen.

The operation of the map data transmitting / receiving apparatus configured as described above will be described below with reference to FIG. (C01) After being connected to the map data management terminal 100 via the communication channel 300, the map data display terminal 200 sends a request R01, which is a registration request, to the map data management terminal 100. Request R01 is composed of command R01a (command name REGISTER), terminal ID
R01b and a memory size value R01c.

The terminal ID R01b contains the terminal ID in the terminal specification storage means 207 of the map data display terminal 200.
The value of 207a is copied and used, and the memory size R01c is used.
The terminal specification storage means 2 of the map data display terminal 200
The value of the terminal ID 207b in 07 is copied and used. (S01-1) The map data management terminal 100 searches the terminal information storage unit 105 for the received terminal ID R01.
Information 10 of a terminal having a terminal ID 105c matching b
Check whether 5b is present. (S01-2) If there is a match, use it.
Proceed to S01-5. If not (S01-3), an area for one terminal information 105b is secured in the information storage means 105. (S01-4) The terminal ID is included in the secured terminal information 105b.
R01b is written there. (S01-5) The value of the memory size R01c of the map data display terminal 200 is written in the display memory size 105d. (S01-6) All 0s are written in the map display position 105e and the map management information 105d in the terminal information 105b. (S01-7) Then, the answer A01 is sent to the map data display terminal 200. Answer A01 is Command A
01a (command name OK). (C02-1) The user instructs display of map data using the input means 205. This instruction method can be used if the map data can be uniquely specified, such as a map file name, a set of map type and leaf number, a set of map type and secondary mesh number, and a set of map type and scale. Anything is fine. (C02-2) The control means 206 sends out a request R02 which is a map acquisition request. The request R02 includes a command R02a (command name GET), a terminal ID R02.
b and a map ID R02c.

The terminal ID R02b contains the terminal ID in the terminal specification storage means 207 of the map data display terminal 200.
The value of 207a is copied and used, and a value generated from the map file name or the like designated by the input unit 205 is used as the map ID R02c.

The request R02 is a command R02
a (command name GET), terminal ID R02b, map ID
A map display position R02d may be added in addition to R02c. (S02-1) Control means 1 of map data management terminal 100
04 checks whether or not the terminal information storage unit 105 has a value that matches the terminal ID value R02b in the received request R02. (S02-2) If there is no match, an answer E02 indicating an error is created and transmitted, and the process ends. Answer E
02 is a command E02a (command name ERROR)
And an identifier E02b (error type: no matching terminal ID) indicating the type of error. (S02-3) If there is a match, map ID R02
The value of c is passed to the map data management means 102 to search the map data. If request R02 contains map display position R
If 02d is included, the value is also passed to the map data management means 102 together. (S02-4) The map data management means 102 searches the map data storage means 101, extracts the map data, adds the map management information, and passes it to the control means 104. (S02-5) The control means 104 extracts the map type, display scale, leaf number, latitude coordinate value and longitude coordinate value of the four corners of the map from the map management information, and sends the information to the terminal in the terminal information 105. The information is written in the transferred map management information 105f.

Which map is to be written in the map management information 105f depends on whether or not a rectangle defined by the coordinates 501 at the lower left corner of the screen in FIG. 4 and the coordinates 502 at the upper right corner of the screen has an area shared by the map. to decide. In FIG. 4, 600 to 60
The map types shown in FIG. 3 for the four maps up to 3,
Write the display scale, map number, latitude and longitude of the lower left corner of the map, latitude and longitude of the upper right corner of the map, latitude and longitude of the upper left corner of the map, and latitude and longitude of the lower right corner of the map. (S02-6) Map display position R in request R02
If 02d is included, the value is written to the map display position 105e displayed on the terminal in the terminal information 105. If not included, the values of the lower left corner and the upper right corner of the longitude and latitude coordinate values of the four corners of the map are set to the map display position 1
05e. (S02-7) Answer A to the map data display terminal 200
02 is sent. Answer A02 is command A02a
(Command name OK) and the extracted map data A02b. (C03-1) Control means 2 of map data display terminal 100
06 represents the received map data A02b as the drawing means 2
Hand over to 02. (C03-2) When the map data A02b is raster data, the map data is displayed on the display screen 201 by the drawing means 203 writing into the display memory 202. When the map data A02b is vector data, the drawing means 203 interprets the contents of the map data A02b and draws it on the display memory 202, so that the map data is displayed on the display screen 2.
01 is displayed. (C03-3) Then, at any time, the user enters the input means 20
5 is used to instruct the movement of the position of the map data.

The movement of the position of the map data means, for example, an operation of changing the display position such that the center of the map data displayed on the display screen 201 is located at the edge of the display screen. However, the movement amount is displayed on the display screen 201 at the center of the map data.
Is not limited to the end, and may be an arbitrary predetermined amount. (C03-4) The control means 206 sends out a request R03 which is a map movement request. The request R03 includes a command R03a (command name MOVE), a terminal ID R03.
b and the movement amount R03c.

The moving amount is composed of a set of a moving amount in the horizontal direction of the screen and a moving amount in the vertical direction of the screen. (S03-1) Control means 1 of map data management terminal 100
04 checks whether or not the terminal information storage unit 105 has a value that matches the terminal ID value R03b in the received request R03. (S03-2) If there is no match, an answer E03 indicating an error is created and sent, and the process ends. Answer E03 contains the command E03a (command name ERROR)
And an identifier E03b (error identification: no matching terminal ID) indicating error identification. (S03-3) If there is a match, the size of the display memory 105d, the map display position 105e displayed on the terminal, and the map management information 105f transferred to the terminal are extracted. (S03-4) The map area to be extracted is calculated from the extracted information and the value of the movement amount R03c in the request R03.

This calculation method will be described in more detail with reference to FIG. In FIG. 6, the coordinates 501 of the lower left corner and the coordinates 502 of the upper right corner of the screen can be known from the map display position 105e displayed on the terminal. The movement vector (latitude movement, longitude movement) 505 on the map can be calculated from the value of the movement amount R03c in the request R03. Therefore, the coordinates 501 'of the lower left corner and the coordinates 502' of the upper right corner of the map to be displayed after the movement are respectively (longitude 501 'of the lower left corner after movement) = (longitude 501 of the lower left corner after movement) + (movement vector Longitude shift),
It can be calculated by the control means 104 as (longitude 502 ′ of upper right corner after movement) = (longitude 502 of upper right corner after movement) + (longitude movement of movement vector). From this calculation, a new area 506 of the map that the map data display terminal 200 does not have is found, and this is the area of the map to be extracted. (S03-5) The control means 104 outputs the area 50 to be extracted.
6 to the map data management means 102 to perform a search,
New map data corresponding to the area 506 is obtained. (S03-6) Answer A to the map data display terminal 200
03 is sent out. Answer A03 is command A03a
(Command name OK) and the extracted map data A03b. (S03-7) The map display position 105e displayed on the terminal in the terminal information 105 and the map management information 105f transferred to the terminal are updated.

The values 501 'and 502' are written in the map display position 105e. 5 is included in the map management information 105f.
The information of the map sharing the area with the rectangle defined by 01 'and 502' is written. The map management information 105f that has already been written and that no longer shares the rectangle defined by 501 'and 502' is deleted. (C04-1) Control means 2 of map data display terminal 200
06, the received map data A02b
Hand over to 2. (C04-2) The control unit 206 transfers the movement amount R03c to the drawing unit 203 and performs block transfer of the display memory. (C04-3) When the map data A02b is raster data, the map data is displayed on the display screen 201 by the drawing means 203 writing into the display memory 202. When the map data A02b is vector data, the drawing means 203 interprets the contents of the map data A02b and draws it on the display memory 202, so that the map data is displayed on the display screen 2.
01 is displayed.

As described above, according to the embodiment of the present invention, first, in the map data transmitting / receiving device including the map data management terminal, the map data display terminal, and the wired or wireless communication path, the map data management terminal Has terminal information storage means for storing terminal specification data relating to the map data display terminal and information relating to the map data transmitted to the map data display terminal. The map data display terminal has a terminal ID of the map data display terminal and a display memory. It has terminal specification storage means for recording size information, and sends out terminal specification data from the map data display terminal prior to sending and receiving map data between the map data management terminal and the map data display terminal. The terminal specification data is written in the terminal information storage means, and the map data When the map data is sent to the display terminal, information about the map data is written in a table in the terminal information storage means, and then the display position of the map is changed using the input means in the data display terminal. Has a function of reading out and using information on the memory size of the map data display terminal and the transmitted map data written in the table in the terminal information storage means in the map data management terminal, By omitting the transmission of the map data already existing in the display memory therein and transmitting only the map data that needs to be newly transmitted, the amount of map data to be transmitted and received can be reduced.

(Embodiment 2) FIG. 7 is a diagram for explaining in detail the contents of the terminal specification storage means 207 according to the second embodiment of the present invention.
c is added. Session ID
207c is a number indicating the progress of communication exchanged between the map data management terminal 100 and the map data display terminal 200.

FIG. 8 is a diagram for explaining in detail the contents of the terminal information storage means 105 according to the second embodiment of the present invention.
It is characterized in that a session ID 105g is added to FIG. The session ID 207c is a number indicating the progress of communication exchanged between the map data management terminal 100 and the map data display terminal 200.

The operation of the map data transmitting / receiving apparatus configured as described above will be described below with reference to FIGS. (C11) After being connected to the map data management terminal 100 via the communication path 300, the map data display terminal 200 sends a request R11 as a registration request to the map data management terminal 100. The request R11 includes a command R11a (command name REGISTER) and a terminal ID.
R11b and a memory size value R11c.

The terminal ID R11b contains the terminal ID in the terminal specification storage means 207 of the map data display terminal 200.
Copy the value of 207a and use it with the memory size R11c
The terminal specification storage means 2 of the map data display terminal 200
The value of the terminal ID 207b in 07 is copied and used. (S11-1) The map data management terminal 100 searches the terminal information storage means 105 and receives the received terminal ID R11.
Information 10 of a terminal having a terminal ID 105c matching b
Check whether 5b is present. (S11-2) If there is a match, use it.
Proceed to S11-5. If not (S11-3), an area for one terminal information 105b is secured in the information storage means 105. (S11-4) The terminal ID is included in the secured terminal information 105b.
R11b is written there. (S11-5) The value of the memory size R11c of the map data display terminal 200 is written in the display memory size 105d. (S11-6) All 0s are written in the map display position 105e and the map management information 105d in the terminal information 105b. (S11-7) A session ID is generated and written to the session ID 105g in the terminal information 105b in the terminal information storage means 105. The initial value of the session ID is 1. (S11-8) Then, the answer A11 is sent to the map data display terminal 200. Answer A11 is Command A
11a (command name OK) and session IDA1
1b. (C12-1) The map data display terminal 200 writes the session ID A11b in the answer A11 to the session ID 207c in the terminal specification storage unit 207. (C12-2) At any time thereafter, the user enters the input means 2
05 to display map data. The method of this instruction is a map file name, a set of map type and leaf number,
Any type of map data such as a set of a map type and a secondary mesh number, and a set of a map type and a scale may be used. (C12-3) The control means 206 sends out a request R12 which is a map acquisition request. The request R12 includes a command R12a (command name GET), a terminal ID R12.
b, a session ID R12c, and a map ID R12d.

The terminal ID R12b has the terminal ID 2 in the terminal specification storage means 207 of the map data display terminal 200.
07a is copied and used, and the session ID R12 is used.
c is the session ID 2 in the terminal specification storage unit 207.
07c, and a value generated from the map file name or the like designated by the input unit 205 is used as the map ID R12d.

The request R12 is a command R12
In addition to a (command name GET), terminal ID R12b, session ID R12c, and map ID R12d, a map display position R12e may be added. (S12-1) Control means 1 of map data management terminal 100
In step S04, the terminal information storage unit 105 checks whether a value that matches the terminal ID value R12b in the received request R12 is present. (S12-2) If there is no match, an answer E11 indicating an error is created and transmitted, and the process ends. Answer E
11 is a command E11a (command name ERROR)
And an identifier E11b (error type: no matching terminal ID) indicating the type of error. (S12-3) If there is a match, the value of the session ID R12c in the received request R12 is
Terminal information 1 in terminal information storage means 105 found
It is determined whether the ID is the same as the session ID 105g in 05b. (S12-4) Answer E indicating error if different
12 is created and sent, and the process is terminated. Answer E12,
It is composed of a command E12a (command name ERROR) and an identifier E12b (error type: no matching session ID) indicating the type of error. At this time, since the session IDs do not match, step (S01)
This means that the map data display terminal 100 could not normally receive the session ID A11b in the answer A11 transmitted in -8). (S12-5) If the session ID is the same, the map I
The value of DR12c is passed to the map data management means 102 to search the map data. If the request R12 includes the map display position R12d, the value is also passed to the map data management means 102 together. (S12-6) The map data management means 102 searches the map data storage means 111, extracts the map data, adds the map management information, and passes it to the control means 104. (S12-7) The control unit 104 extracts the map type, the display scale, the leaf number, the latitude coordinate values and the longitude coordinate values of the four corners of the map from the map management information, and sends them to the terminal in the terminal information 105. The information is written in the transferred map management information 105f.

Which map is to be written in the map management information 105f depends on whether or not a rectangle defined by the coordinates 511 at the lower left corner of the screen in FIG. 4 and the coordinates 502 at the upper right corner of the screen has an area shared by the map. to decide. In FIG. 4, 600 to 60
The map types shown in FIG. 3 for the four maps up to 3,
Write the display scale, map number, latitude and longitude of the lower left corner of the map, latitude and longitude of the upper right corner of the map, latitude and longitude of the upper left corner of the map, and latitude and longitude of the lower right corner of the map. (S12-8) Map display position R in request R12
If 12d is included, the value is written to the map display position 105e displayed on the terminal in the terminal information 105. If not included, the values of the lower left corner and the upper right corner of the longitude and latitude coordinate values of the four corners of the map are set to the map display position 1
05e. (S12-9) The value of the session ID is increased by one. The information is written to the session ID 105g in the terminal information 105b in the terminal information storage means 105. (S12-10) The answer A12 is sent to the map data display terminal 200. Answer A12 is command A12a
(Command name OK), session ID A12b, and extracted map data A12c.

FIG. 10 will be described below. (C13-1) The map data display terminal 200 writes the session ID A12b in the answer A12 to the session ID 207c in the terminal specification storage unit 207. (C13-2) Control means 2 of map data display terminal 100
06, the received map data A12c
Hand over to 2. (C13-3) When the map data A12c is raster data, the map data is displayed on the display screen 201 by the drawing means 203 writing into the display memory 202. When the map data A12c is vector data, the drawing means 203 interprets the contents of the map data A12c and draws it on the display memory 202, so that the map data is displayed on the display screen 2.
01 is displayed. (C13-4) At any time thereafter, the user enters the input means 2
05 is used to instruct the movement of the position of the map data. The movement of the position of the map data refers to, for example, an operation of changing the display position such that the center of the map data displayed on the display screen 201 is located at the edge of the display screen. However, the amount of movement is not limited to the center of the map data just located at the edge of the display screen 201, and may be an arbitrary predetermined amount. (C13-4) The control means 206 sends out a request R13 which is a map movement request. The request R13 includes a command R13a (command name MOVE), a terminal IDR13.
b, session ID R13c, and movement amount R13d
Consists of

The moving amount is composed of a set of a moving amount in the horizontal direction of the screen and a moving amount in the vertical direction of the screen. (S13-1) Control means 1 of map data management terminal 100
In step S04, it is checked whether or not the terminal information storage unit 105 has a value matching the terminal ID value R13b in the received request R13. (S13-2) If no match is found, an answer E13 indicating an error is created and sent, and the process ends. Answer E13 has a command E13a (command name ERROR).
And an identifier E13b (error type: no matching terminal ID) indicating the type of error. (S13-3) If there is a match, the value of the session ID R13c in the received request R13 is
Terminal information 1 in terminal information storage means 105 found
It is determined whether the ID is the same as the session ID 105g in 05b. (S13-4) Answer E indicating an error if different
14 is created and transmitted, and the process is terminated. Answer E14,
It is composed of a command E14a (command name ERROR) and an identifier E14b (error type: no matching session ID) indicating the type of error. At this time, since the session IDs do not match, step S12-
0 in session A in answer A12
This means that the DA 12b could not be normally received by the map data display terminal 100. (S13-5) If they match, the size of the display memory 105d therein and the map display position 1 displayed on the terminal
05e, and the map management information 105 transferred to the terminal
Take out f. (S13-6) The map area to be extracted is calculated from the extracted information and the value of the movement amount R13c in the request R13.

This calculation method is the same as in the first embodiment. (S13-7) The control unit 104 selects the area 50 to be extracted.
6 to the map data management means 102 to perform a search,
New map data corresponding to the area 506 is obtained. (S13-8) Increase the value of the session ID by one. The information is written to the session ID 105g in the terminal information 105b in the terminal information storage means 105. (S13-9) Answer A to the map data display terminal 200
13 is sent out. Answer A13 is command A13a
(Command name OK), session ID A13b, and extracted map data A13c. (S13-10) The map display position 105e displayed on the terminal in the terminal information 105 and the map management information 105f transferred to the terminal are updated.

The values 501 'and 502' are written in the map display position 105e. 5 is included in the map management information 105f.
The information of the map sharing the area with the rectangle defined by 01 'and 502' is written. The map management information 105f that has already been written and that no longer shares the rectangle defined by 501 'and 502' is deleted. (C14-1) The map data display terminal 200 writes the session ID A13b in the answer A13 into the session ID 207c in the terminal specification storage unit 207. (C14-2) Control means 2 of map data display terminal 200
06 represents the received map data A13b as the drawing means 2
Hand over to 02. (C14-2) The control means 206 transfers the movement amount R13c to the drawing means 203 and performs block transfer of the display memory. (C14-3) When the map data A13c is raster data, the map data is displayed on the display screen 201 by writing by the drawing means 203 to the display memory 202. When the map data A13c is vector data, the drawing means 203 interprets the contents of the map data A13c and draws the map data on the display memory 202, whereby the map data is displayed on the display screen 201.

As described above, in the embodiment of the present invention, in addition to the same configuration as in the first embodiment, the terminal specification storage unit 20
7 and the terminal information storage means 105
D for storing an area for storing map data,
00 determines the initial value of the session ID, stores it in the terminal information storage means and sends it to the map data display terminal 200. The map data display terminal 200 stores the session ID in the terminal specification storage means, and The map data display terminal 200 sends the session ID stored in the terminal specification storage unit 105 to the map data management terminal 100, returns a value obtained by incrementing the session ID by 1, and stores it in the terminal information storage unit 207.

As a result, the map data management terminal 100 determines that the previous communication has been completed normally because the sent session ID value matches the session ID value in its own terminal information storage means 207. It is to detect that the previous communication could not be completed normally due to knowing and not matching.

(Embodiment 3) FIG. 11 is a view for explaining a configuration of a map transmitting / receiving apparatus according to a third embodiment of the present invention. The terminal information storage means 105 is removed from the management terminal 100, and the map data information storage means 208 is added to the map data display terminal 200.

FIG. 12 is a diagram for explaining in detail the contents of the map data information storage means 208 according to the third embodiment of the present invention.
It is composed of display position information 208a indicating the position of the map data existing on the map on the map, and map information 208b indicating the management information of the map data existing on the map data display terminal 200. Display position information 208a, map information 20
8b is a map display position 105e displayed on the terminal in FIG. 3 and management information 1 of a map associated with the terminal.
05f.

FIG. 13 illustrates the operation procedure of the map data information storage means and the like according to the third embodiment of the present invention. (C15-1) The communication means 204 sends a map acquisition request from the map data display terminal 100 to the map data management terminal 200. (S15-1) In the map data management terminal 100, the map I
The map data is extracted by D and the position and size of the map and the map data are transmitted. (C16-1) The map data display terminal 200 receives the number of corresponding maps and the map data, calculates a new map position and size using a means (not shown) for instructing a map movement, and sends a movement request to the map data. Send it to the management terminal 100. (S16-1) The map data management terminal 100 compares the sent previously acquired map ID with the map display position, finds a new map ID if necessary, and sends out the map data. (S17-1) The map data display terminal 200 searches for an entry that matches the map ID sent to the map data information storage means 208. (S17-2) If there is no match, a new one is created, and the map ID and the map position / size are updated. Further, the position and size of the display memory 202 are set, and the map data is written to the display memory 202.

According to the map data transmission / reception device configured as described above, similarly to the first embodiment of the present invention, transmission of the map data already existing in the display memory in the map data display terminal is performed. By omitting and sending only the map data that needs to be newly sent, the amount of map data to be sent and received can be reduced.

(Embodiment 4) FIG. 14 is a diagram for explaining the configuration of a map transmitting / receiving apparatus according to a fourth embodiment of the present invention. The display terminal 200 has a map data storage unit 209 added thereto.

According to the map data transmission / reception device configured as described above, similarly to the first embodiment of the present invention, transmission of the map data already existing in the display memory of the map data display terminal is performed. By omitting and sending only the map data that needs to be newly sent, the amount of map data to be sent and received can be reduced. The display memory 202
By storing map data having a capacity equal to or larger than the capacity, map data lost from the display memory 202 due to movement of the map display position can be displayed without transmitting and receiving again.

(Fifth Embodiment) FIG. 15 is a diagram for explaining in detail the contents of map management data 102a possessed by a map data management means 102 according to a fifth embodiment of the present invention.

FIG. 14 is a diagram for explaining in detail the contents of the map data information storage means 208 according to the fifth embodiment of the present invention.

The operation of the map data transmission / reception device configured as described above will be described below with reference to FIG. However, for example, the map data has already been transmitted to the map data display terminal 200 by the method described in the first embodiment of the present invention, and the same as the area currently existing in the display memory 202 of the map data display terminal 200. It is assumed that the user has requested the update of the map data of the area.
Further, the portions described in the above embodiments will be described only briefly. (C21-1) The user gives an instruction to update the map data using the input means 205. (C21-2) The control means 206 sends out a request R21 which is a map update request command. Request R21
Is the command R21a (command name UPDATAT)
E), terminal ID R21b, map ID R21c, map version number R01d, and map display position R21.
e. (S21-1) Terminal ID R2 in request R02
Search for terminal information having the same value as 1b. (S21-2) If not found, send an answer E21 indicating an error. The answer E21 includes a command E21a (command name ERROR) and an identifier E21b (error type: matching terminal I
D). (S21-3) If found, map data is searched. (S21-4) Extract map data and map management information.
At this time, the version number 102e of the corresponding map is extracted. (S21-5) The value of the version number R21d in the request R21 is compared with the value of the version number of the map management information in the map data management means. (S21-6) If the value of the version number R21d in the request R21 is newer, an answer E22 indicating that updating is unnecessary for this figure is transmitted. The answer E22 includes a command E22a (command name ERR).
OR) and an identifier E22b (error type: update not required) representing the type of error. (S21-7) If the value of the version number R21d in the request R21 is older, the map management information is updated. (S21-8) The display position of the map is updated. (S21-9) Answer A to the map data display terminal 200
21 is transmitted. Answer A21 is command A21a
(Command name OK), map version number A21b,
And map data A21c. The value of the version number 102e found in S21-4 is used for the version number A21b of the map. (C22-1) The map data is passed to the drawing means 203. (C22-2) The map data drawing means 203 displays map data. (C22-3) If there is map data that has not been updated on the map data display terminal side, the process repeats from step C21-2.

As described above, in the embodiment of the present invention, an area for holding the version number of the map data is prepared in each of the map data management terminal and the map data display terminal, and the map data is transmitted from the map data management terminal. After the map data is sent to the map data display terminal and the map data on the map data management terminal is updated, the map data display terminal sends the version number together with the map data when the map data display terminal requests the same area again. Map data can be replaced with new ones.

(Embodiment 6) The steps of the sixth embodiment are replaced with the following. (C22-1) The map data is passed to the drawing means 203. (C22-2) The map data drawing means 203 displays map data.

As described above, in the embodiment of the present invention, an area for holding the version number of the map data is prepared in each of the map data management terminal and the map data display terminal, and the map data is transmitted from the map data management terminal. After the map data is sent to the map data display terminal and the map data on the map data management terminal is updated, the map data display terminal sends the version number together with the map data when the map data display terminal requests the same area again. Map data can be replaced with old ones.

(Embodiment 7) FIG. 18 is a diagram for explaining the configuration of a map transmitting / receiving apparatus according to a seventh embodiment of the present invention.
00 indicates that there are a plurality.

FIG. 19 is a view for explaining the spatial relationship of map data possessed by the map data management terminal 100 according to the seventh embodiment of the present invention. Set of maps 1000
Shows a collection of secondary meshes in the Kanto region as an example. Numerical values described for the 20 secondary meshes of 1000 are numbers indicating secondary area divisions defined in JIS-X410-1976, and are called secondary mesh codes.
In the 1/25000 topographic map, this secondary mesh is used as a map leaf.

The map data management terminal 100-A and the map data management terminal 100-B in FIG. 19 are two of the map data management terminals connected in FIG. The map data management terminal 100-A stores secondary meshes 533934, 533935,
The map data management terminal 100-B stores the secondary meshes 533936 and 5339 in its own map data storage means 101.
It is assumed that the user has 46 map data. The map data management means 102 of the map data management terminal 100-A determines that each of the secondary meshes is link information link1, link to the map data in the adjacent 100-A.
2,. . . , Link12. Similarly, the map data management means 102 of the map data management terminal 100-B has link information link13 and link14. Further, the map data management means 102 of the map data management terminal 100-A
Has LINKA and LINKC which are link information to the map data existing in the map data management terminal 100-B. The map data management means 102 of the map data management terminal 100-B includes LINKKB, LIN, which are link information to map data existing in the map data management terminal 100-A.
Has KD.

FIG. 20 is a view for explaining the map data management means of the map data management terminal 100 according to the seventh embodiment of the present invention. Map data management terminal 100
Explanation will be made by taking the map data of the secondary mesh 533935 in -A as an example. The map data 533935 has link information of eight adjacent directions. If the link information indicates a map in the same map data management terminal 100-A (for example, a link to the left map), the map data storage unit 10
2 is retained. When a map in another map data management terminal 100-B is pointed (for example, a link to the map on the right), a set of a terminal ID and a leaf number is held.

As described above, in the embodiment of the present invention, when the map data display terminal requests the movement of the map, the currently connected map data connection terminal has the link information between the maps of the plurality of map data management terminals. Even if the destination map data does not exist in the map data management terminal, the map data can be extracted by following the link information to another map data management terminal.

In addition to the set of the terminal ID and the figure number, a URL (Uniform Resource) used in, for example, WWW (World Wide Web) or the like is used.
It is needless to say that the location may be “Location”.

(Embodiment 8) FIG. 21 shows the relationship between map data of different scales according to an eighth embodiment of the present invention. The map has a large-scale map like a city planning map (1 / 2,500), a residential map, a medium-scale map like a 1/25000 topographic map, and a small-scale map like a 1: 200,000 topographic map. There is. 1 for smaller scale maps
The area displayed on a single map increases. FIG. 21 is a diagram expressing the relationship between such maps having different scales. For the sake of simplicity, it is assumed that the map is a three-step map, and a map obtained by combining two maps of a certain step vertically and horizontally is a one-step small scale map.

FIG. 22 is a view for explaining the relationship between the scales of the map data possessed by the map data management terminals 100-A, 100-B and 100-C according to the eighth embodiment of the present invention. The map data management terminal 100-A is shown in FIG.
Map data management terminal 100
−B holds the middle-range map in FIG. 21, and the map data management terminal 100-C holds the narrow-range map in FIG. In FIG. 21, the map data management terminal 100-
B is the four mid-range maps 1031, 1032, 1033, 1
034. The information of the map 1032 includes link information to one upper map and link information to four lower maps. Each piece of link information holds a pair of a terminal ID and a leaf number.

As described above, according to the embodiment of the present invention, when the map data display terminal requests a change in the scale of the map, the current connection is established by having the link information between the maps of the plurality of map data management terminals. Even if the map data of the reduced scale does not exist in the inside map data management terminal, the map data can be extracted by following the link information to another map data management terminal.

In addition to the set of the terminal ID and the figure number, a URL (Uniform Resource) used in, for example, WWW (World Wide Web) or the like is used.
It is needless to say that the location may be “Location”.

(Embodiment 9) FIG. 23 is a diagram for explaining the configuration of a map transmitting / receiving apparatus according to a ninth embodiment of the present invention.
00, the index data management terminal 110 in addition to the communication path 300
0 is added. The index data management terminal 1100 is an index data storage unit 1 storing index data such as a search tree.
101, a search is performed using a relational record storage unit 1102 that stores a relational record including information such as the item name and latitude / longitude of each item of the search target data, a search data storage unit 1101, and a relational record storage unit 1102. A search unit 1103 that retrieves data for each item by communication, a communication unit 1104 that performs communication, and a control unit 1105 that controls the search unit 1103 and the communication unit 1104.

FIG. 24 shows search data storage means 11 of the present invention.
FIG. 11 is a diagram for describing in detail the contents of a record No. 01 and a relation record storage unit 1102. Search data storage means 110
1 includes tree structure data 1101a and 1101 for address search.
1b, 1101c and 1101d, tree structure data 1101e, 1101f and 1101g for telephone number search, and tree structure data 1101h to 11011 for facility search are stored. Information corresponding to each item of the search data storage unit 1101 is stored in the relation record storage unit 1102. For example, a node 1101b having an address search tree structure
"Tokyo 23 Wards" stores information 1102a on "Tokyo 23 Wards" in the related record together with a pointer to a further lower node. Further, as information of the relation record, information indicating an area such as 1102b and 1102d
And information indicating a point.

As described above, in the embodiment of the present invention, by providing the index data management terminal, when the map data display terminal 200 acquires the map data, the target is determined by the search data possessed by the search data management terminal. Further, the search data management terminal can generate an inquiry to a plurality of map data management terminals using the position information of the search target stored in its own related record.

(Embodiment 10) FIG. 25 shows a first embodiment of the present invention.
FIG. 25 is a diagram showing another configuration of the relation record storage means in the embodiment of FIG. A list 1102e of map data management terminals having this information is added to the relation record.

As described above, in the embodiment of the present invention, the list 110 of the map data management terminal having the relevant information in the related record is provided.
2e, when the map data display terminal 200 acquires the map data, the target is determined based on the search data of the search data management terminal, and the search data management terminal 200 stores the search data stored in its own related record. When inquiries are made to a plurality of map data management terminals using the target location information, the map data management terminals that make inquiries can be limited to those listed in the map data management terminals having this information.

(Embodiment 11) FIG. 26 shows a first embodiment of the present invention.
FIG. 9 is a diagram illustrating another configuration of the relation record storage unit according to the first embodiment. List 1102 of map data management terminals having this information in relation records and map IDs for each terminal
Add f.

As described above, in the embodiment of the present invention, the map data display terminal 200 obtains the map data by providing the map data management terminal having this information in the relation record and the list 1102f of the map ID for each terminal. When performing a search, the target is determined by the search data of the search data management terminal, and the search data management terminal issues inquiries to multiple map data management terminals using the position information of the search target stored in its own related record In this case, the map data management terminal and the map ID to be inquired can be limited to those listed in the map data management terminal having this information and the map ID.

(Twelfth Embodiment) With the same configuration as the tenth embodiment of the present invention, a list 1102e of map data management terminals having this information can be written in a relation record. When searching for a target that is not listed in the list 1102e, if a search target is found, the result is written to the list 1102e.

As described above, in the embodiment of the present invention, in addition to the function of the tenth embodiment, the terminal ID is originally stored in the relation record.
Even if you do not have the information about the search data, the search results are retained, so that the next time you perform the same search, the map data management terminal to be queried will be listed on the list of map data management terminals that have this information. Can be limited.

(Embodiment 13) A map data management terminal having the same information as that of the eleventh embodiment of the present invention in a relation record and a list 1102 of map IDs for each terminal.
f is writable. When searching for a target that is not listed in the list 1102f, if a search target is found, the result is written to the list 1102f.

As described above, in the embodiment of the present invention, in addition to the function of the tenth embodiment, the terminal ID is originally stored in the relation record.
Even if the user does not have the information on the map ID, the search result is retained, so that the next time the same search is performed, the map data management terminal to be queried is listed with the map data management terminal having this information and the map ID. Can be limited to those listed in.

(Embodiment 14) FIG. 27 shows a first embodiment of the present invention.
It is a figure showing the correspondence of the index item in 4th Embodiment, and the layer of map data.

For example, when a user selects an IC name from an index to display a map, the user first draws a highway layer, and then searches for the item itself (a specific IC).
Name) is drawn. It then indicates that other layers should be drawn as needed.

Similarly, when displaying a map by selecting a station name from the index, the railway / station layer is drawn first, and then the searched items (specific station names) are drawn in an overlapping manner. It then indicates that other layers should be drawn as needed.

FIG. 28 shows a display example of a map layer according to the fourteenth embodiment of the present invention. Reference numeral 1201 denotes a state in which the Tanimachi IC is searched using the index data of the IC on the expressway according to the present method, and as a result, the names of the expressway and the Tanimachi IC are drawn. 1202 is Tanimachi I
This is an enlarged view centering around C. 1203 is
This is the result of drawing all layers thereafter.

FIG. 29 shows another display example of the map layer according to the fourteenth embodiment of the present invention. Reference numeral 1204 denotes a state in which Shinjuku Station is searched using the index data of the station name according to this method, and as a result, the railway is displayed.
At 1204, 1205 is an enlarged display centered on the place where Shibuya is registered. When all layers are further displayed, the result becomes 1206.

As described above, in the embodiment of the present invention, the items of the index are associated with the map data layer, and the drawing order of the map data layer is changed depending on the type of the index used for the search. As a result, it is possible to display the vicinity to be searched by the index by transferring only a small amount of data.

[0097]

As described above, according to the present invention, first, the transmission of the map data already existing in the display memory of the map data display terminal is omitted, and only the map data which needs to be newly transmitted is omitted. , The effect of reducing the amount of map data to be transmitted and received is obtained.

Second, the map data management terminal confirms that the previous communication was completed normally when the sent session ID value matches the session ID value in its own terminal information storage means. By knowing and not matching, it is possible to detect that the previous communication could not be completed normally.

Third, by omitting the transmission of the map data already existing in the display memory of the map data display terminal and transmitting only the map data that needs to be newly transmitted, the amount of map data to be transmitted / received is reduced. Can be reduced.

Fourth, the amount of map data to be transmitted / received is reduced by omitting the transmission of the map data already existing in the display memory of the map data display terminal and transmitting only the map data that needs to be newly transmitted. By saving map data that exceeds the capacity of the display memory, the map data lost from the display memory due to the movement of the display position of the map can be displayed without transmitting and receiving again. The effect is obtained.

Fifth, an area for holding the version number of the map data is prepared in each of the map data management terminal and the map data display terminal, and the map data is sent from the map data management terminal to the map data display terminal. Later, when the map data display terminal requests the same area again after the map data on the map data management terminal is updated, the version number is sent together with the map data to make the map data on the map data display terminal new. The effect of being able to replace is obtained.

Sixth, an area for holding the version number of the map data is prepared in each of the map data management terminal and the map data display terminal, and the map data is sent from the map data management terminal to the map data display terminal. Later, when the map data display terminal requests the same area again after the map data on the map data management terminal is updated, the map data on the map data display terminal is made old by sending the version number together with the map data. The effect of being able to replace is obtained.

Seventh, by having link information between the maps of a plurality of map data management terminals, when the map data display terminal requests a map movement, the map data management terminal moves to the currently connected map data management terminal. Even when the previous map data does not exist, the effect is obtained that the map data can be extracted by following the link information to another map data management terminal.

Eighth, by having link information between the maps of a plurality of map data management terminals, when the map data display terminal requests a change in the scale of the map, the map data management terminal currently connected to the map data management terminal is connected to the map data management terminal. Even when there is no map data of the reduced scale, there is an effect that the map data can be extracted by following the link information to another map data management terminal.

Ninth, with the provision of the index data management terminal, when the map data display terminal acquires map data, the target is determined by the search data possessed by the search data management terminal. There is an effect that inquiries can be made to a plurality of map data management terminals using the position information of the search target stored in the related record.

Tenth, by providing a list of map data management terminals having this information in the related record, when the map data display terminal acquires map data, the target is determined by the search data of the search data management terminal. In addition, when the search data management terminal issues an inquiry to a plurality of map data management terminals using the position information of the search target stored in its own related record, the search data management terminal has the information of the map data management terminal that makes the inquiry. The effect is obtained that it can be limited to those listed in the map data management terminal.

Eleventh, the map data management terminal having the main information and the list of the map IDs for each terminal are provided in the relation record, so that the map data display terminal obtains the map data when the map data display terminal acquires the map data. A map that determines a target based on the search data possessed by the user, and queries the plurality of map data management terminals when the search data management terminal generates an inquiry using the location information of the search target stored in its own related record. The effect is obtained that the data management terminal and the map ID can be limited to those listed in the map data management terminal having this information and the map ID.

Twelfth, a list of map data management terminals having this information can be written in the related record, and when a new object is searched for and succeeded, the result is saved. Has the effect that the map data management terminal making an inquiry can be limited to those on the list of map data management terminals having this information.

Thirteenth, a map data management terminal having this information and a list of map IDs for each terminal can be written in a related record, and when a new object is searched and succeeded, the result is stored. The next time the same search is performed, the effect is obtained that the map data management terminal to be inquired can be limited to those listed in the map data management terminal having this information and the map ID.

Fourteenth, by associating index items with map data layers and changing the drawing order of the map data layers according to the type of index used in the search,
The effect of being able to display the vicinity to be searched by the index by transferring only a small amount of data is obtained.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a map transmitting / receiving apparatus according to a first embodiment of the present invention.

FIG. 2 is a diagram showing contents of a terminal specification storage unit according to the first embodiment of the present invention;

FIG. 3 is a diagram showing contents of a terminal information storage unit in the first embodiment of the present invention.

FIG. 4 is a diagram showing a relationship between contents of terminal information storage means, map data, and a display memory according to the first embodiment of the present invention.

FIG. 5 is a diagram showing the principle of the map transmitting / receiving apparatus according to the first embodiment of the present invention.

FIG. 6 is a view for explaining a method of calculating a map area to be extracted according to the first embodiment of the present invention;

FIG. 7 is a diagram showing contents of a terminal specification storage unit according to the second embodiment of the present invention;

FIG. 8 is a diagram showing the contents of a terminal information storage means in the second embodiment of the present invention.

FIG. 9 is a first diagram illustrating the principle of a map transmitting / receiving device according to a second embodiment of the present invention;

FIG. 10 is a second diagram illustrating the principle of the map transmitting / receiving device according to the second embodiment of the present invention;

FIG. 11 is a diagram illustrating a configuration of map transmission and reception according to a third embodiment of the present invention.

FIG. 12 is a diagram showing contents of a map data storage unit according to the third embodiment of the present invention.

FIG. 13 is a diagram showing an operation of a map data storage unit according to the third embodiment of the present invention.

FIG. 14 is a diagram showing a configuration of a map transmitting / receiving apparatus according to a fourth embodiment of the present invention.

FIG. 15 is a diagram showing contents of a map data management means according to a fifth embodiment of the present invention.

FIG. 16 is a diagram showing contents of a map data information storage unit according to a sixth embodiment of the present invention.

FIG. 17 is a diagram showing the principle of a map transmitting / receiving apparatus according to a sixth embodiment of the present invention.

FIG. 18 is a diagram showing a configuration of a map transmitting / receiving apparatus according to a seventh embodiment of the present invention.

FIG. 19 is a diagram showing a spatial relationship between map data held by a plurality of map data management terminals according to the seventh embodiment of the present invention.

FIG. 20 is a diagram showing a relationship between map data management means of a map data management terminal according to a seventh embodiment of the present invention.

FIG. 21 is a diagram showing a relationship between map data of different scales according to the eighth embodiment of the present invention.

FIG. 22 is a diagram showing a relationship between map data management means of a map data management terminal according to the eighth embodiment of the present invention.

FIG. 23 is a diagram showing a configuration of a map transmitting / receiving apparatus according to a ninth embodiment of the present invention.

FIG. 24 is a diagram showing contents of search data storage means and relation record storage means in the ninth embodiment of the present invention.

FIG. 25 is a diagram showing a configuration of a relation record storage unit according to the tenth embodiment of the present invention.

FIG. 26 is a diagram showing another configuration of the relation record storage unit according to the tenth embodiment of the present invention.

FIG. 27 is a diagram showing correspondence between layers of map data and index items according to a fourteenth embodiment of the present invention;

FIG. 28 is a diagram illustrating a display example of a map layer according to a fourteenth embodiment of the present invention.

FIG. 29 is a diagram showing a display example of another map layer according to the fourteenth embodiment of the present invention.

FIG. 30 is a diagram illustrating the principle of a conventional invention.

[Description of sign]

 Reference Signs List 100 map data management terminal 101 map data storage means 102 map data management means 105 terminal information storage means 200 map data display terminal 202 drawing memory 203 drawing means 207 terminal specification storage means 208 map data information storage Means 209 Map data storage means 300 Communication channel 1100 Index data management terminal 1101 Search data storage means 1102 Relationship record storage means

Claims (14)

[Claims] 1. A map data transmitting / receiving apparatus comprising a map data management terminal, a map data display terminal, and a wired or wireless communication path, wherein the map data management terminal includes terminal specification data relating to the map data display terminal and Terminal information storage means for storing information relating to the map data; the map data display terminal having terminal specification storage means for recording the terminal ID of the map data display terminal and the size information of the display memory of the map data display terminal; Prior to sending and receiving map data between the map data management terminal and the map data display terminal, the map data display terminal sends out the terminal specification data, and the map data management terminal stores the received terminal specification data and information on the map data in the terminal information. After writing to the terminal information storage means, the display memory size written to the terminal information storage means is stored. A map data transmitting / receiving apparatus for changing a display position of a map by reading information about the map data transmitted from the map data. And a terminal information storage unit capable of storing a session number and a terminal specification storage unit. When transmitting and receiving map data between the map data management terminal and the map data display terminal, the map data display terminal , The map data management terminal updates the session number each time the map data management terminal answers the request, so that the map data management terminal can store the session number sent from the map data display terminal and the terminal information storage. 2. The map data transmitting / receiving apparatus according to claim 1, wherein the difference is detected by comparing with a session number stored in a table corresponding to the map data display terminal of the means. 3. A map data transmitting / receiving apparatus comprising a map data management terminal, a map data display terminal, and a wired or wireless communication path, wherein the map data display terminal has a terminal ID of the map data display terminal.
An area for storing map information relating to the map data currently stored in the display memory among the map data sent to the map data display terminal. And a map data information storage unit that prepares at least one map data. The map data display terminal writes the position in the display memory to the map data information storage unit when receiving the map data from the map data management terminal. A map data transmitting / receiving apparatus for reading a position in a display memory written in a map data information storage means when an attempt is made to change a display position of a map. 4. A map data display terminal comprising a map data storage means for preliminarily storing map data received by said map data display terminal, and omitting a transmission request for map data already stored in said map data storage means. 4. The map data transmitting / receiving apparatus according to claim 3, wherein a transmission request is transmitted only for map data that needs to be newly transmitted. 5. When storing map data, an identifier of the map data and a version number are written in a map data information storage means corresponding to the map data, and when transmitting and receiving the map data, the identifiers of the map data are the same. 5. The method according to claim 4, wherein the map data is transmitted only when the version number of the map data on the map data management terminal side is newer than the version number of the map data on the map data display terminal side. Map data transmission / reception device. 6. The map data transmitting / receiving apparatus according to claim 5, wherein the map data is transmitted / received only when the version number of the map data is old. 7. There are a plurality of map data management terminals, and the spatial relationship between the map data stored in one map data management terminal and the map data stored in another map data management terminal is represented by the map. 7. The map data transmitting / receiving apparatus according to claim 1, wherein the data is stored in a data management unit. 8. The map data management means stores a scale relationship between map data stored in a map data management terminal and map data stored in another map data management terminal. The map data transmitting / receiving device according to claim 1. 9. Search data storage means for storing search data for searching map data, relation record storage means for storing relation data including latitude coordinates and longitude coordinates for each search item, and said search data An index data management terminal having a storage means and a search means for accessing the relational record storage means; when searching map data, the search means searches the search data stored in the search data storage means; 9. The map data transmission / reception according to claim 7, wherein the relation data for the item corresponding to the search is retrieved from the relation record storage means, and the map data management terminal is searched using the relation data as a search key. apparatus. 10. The map data transmitting / receiving apparatus according to claim 9, wherein the map data management terminal is specified by having an identifier of the map data management terminal in the relation data of the index data management terminal. 11. The map data transmitting / receiving apparatus according to claim 10, wherein a search is performed in the corresponding map data management terminal by having an identifier of the map data in the relation data of the index data management terminal. 12. The index data management terminal further includes a relation record storage unit for storing an identifier of the map data management terminal when at least the search of the map data management terminal according to claim 9 is successful. Map data transmission / reception device. 13. The index data management terminal further includes a relation record storage unit that stores an identifier of the map data management terminal and an identifier of the map data when at least the search of the map data management terminal according to claim 9 is successful. A map data transmission / reception device characterized by the above-mentioned. 14. When transferring map data from a map data display terminal, the transfer order of map data from the map data management terminal to the map data display terminal is changed according to the type of index data used by the index data management terminal. 14. The map data transmitting / receiving apparatus according to claim 9, wherein: