JPH0844768A - Graphic data transmission system - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] In the communication of graphic data, the transmission time is shortened by transmitting the minimum amount of data. [Structure] The slave station extracts graphic data from the optical disc 15, specifies a search range, and transmits it as cutout data to the master station 1. When the master station 1 receives the cutout data, the slave station includes a graphic including the search range from the database. Data is extracted, the update date and time of the graphic data and the update date and time of the cutout data are checked, and the graphic data is transmitted only when the update date and time of the cutout data on the master station side is older.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a graphic data transmission system for transmitting map data of detailed maps of facilities for public utilities.

[0002]

2. Description of the Related Art In a conventional mapping system,
The topographic data and equipment data such as gas, electricity, water, and communication facilities such as utilities are held in a large computer of the parent station and managed and searched. On the other hand, a portable small portable personal computer (slave station computer) is installed in a branch office or an emergency vehicle, and the map data held by the master station is stored, for example, once a year in a CD-ROM as an external storage device.
By writing this CD-ROM to a slave station, the slave station also displayed and searched the map data.

When performing a search, the slave station side displays general graphic data, specifies a search range, sends this search range to the master station side, and the master station side sends detailed graphic data within this search range. Was sent, and the slave station side displayed this detailed graphic data and performed a search.

[0004]

However, there is a problem that it takes a long time to send all the detailed graphic data within the search range from the master station to the slave station.

The present invention has been made in view of the above problems, and an object thereof is to provide a graphic data transmission system capable of shortening the data transmission time by transmitting a minimum amount of data. To provide.

[0006]

In order to achieve the above-mentioned object, the present invention is a system comprising a master station and a slave station, wherein the master station stores a database for storing graphic data and an update date and time. It additionally has an updating means for updating the graphic data and a means for sending all the graphic data in the database to a slave station every predetermined period, and the slave station has all the graphic data sent from the master station. In the system having a display means for displaying, the slave station has means for designating a search range and sending the search range and update date and time to the master station, and the master station is When the search range and the update date and time sent are received, the update date and time on the master station side is compared with the update date and time sent from the slave station to determine whether updated graphic data exists within the search range. Within the search range When updated graphic data exists, means for sending the updated graphic data to the slave station, and the slave station for displaying the updated graphic data sent from the master station are provided. Is a graphic data transmission system.

[0007]

According to the present invention, the slave station designates the search range and sends it to the master station. When the master station receives the search range sent from the slave station, the master station saves it in the external storage device of the slave station. Judge whether there is graphic data updated after the time point,
When the updated graphic data exists within the search range, the updated graphic data is sent to the slave station, and the slave station displays the updated graphic data sent from the master station.

[0008]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a hardware configuration diagram of a graphic data transmission system according to an embodiment of the present invention. In FIG. 1, 1 is a master station, 2-1, 2-2, 2-3, ... Is a slave station, 3 is a host computer, and 5 is a disk controller. The database 7 stores graphic data including topographical data such as roads and facility data such as gas pipes. The application program 9 uses the search shown in this embodiment,
The update process is executed under the host computer 1. At the time of search and update processing, necessary data is taken out to the work file 11 and processed. The optical disk writing device 13 writes the graphic data in the database 7 onto the optical disk 15. Reference numeral 17 is a workstation, 19 is a terminal device, and the digitizer 21 is used, for example, when there is gas piping work and the graphic data is corrected when the position of the gas piping is changed. The host computer 3 includes a communication device 23, a master station side modem 25, a communication line 2
6 is connected to each slave station 2-1, 2-2, 2-3, ....

For example, the slave station 2-1 is the slave station side modem 2
7, a pen input personal computer 29, and an optical disk reader 33. The pen input personal computer 29 uses the pen 31 to specify the search range and the like. The optical disc reading device 33 reads the contents of the optical disc 15 created by the optical disc writing device 13 of the master station 1 and sent to the slave station 2-1 at regular intervals (for example, once a year). The same applies to the slave stations 2-2, 2-3, ....

The case where the terrain data shown in FIG. 9 is updated as shown in FIG. 10 will be described below as an example.

First, the data updating process in the master station 1 will be described with reference to the flowchart of FIG. The operator
Paste the modified drawing to the digitizer 21 (step 20
1) The drawing number and layer number to be corrected are input from the keyboard of the terminal device 19 (step 202).
Here, the layer number is a number attached to the terrain data, facility data, and the like. The application program 9 extracts the graphic data corresponding to the input drawing number and layer number from the database 7 and expands it in the work file 11 (step 203).

FIG. 6 is a record format diagram of the graphic data 51 stored in the database 7. The graphic data 51 has a layer number 52, a record number 53, an update date / time 54, a graphic range 55, a data count 57, and coordinate data 59. The layer number 52 contains the number of the layer in which the record exists, and the record number 53 contains the number unique to each record. The update date and time 54 contains the latest date and time when the graphic data record 51 was updated. In the graphic range 55, the maximum value and the minimum value in the X coordinate and the Y coordinate of the coordinate data 59 are entered. The data number 57 contains the data number N of the coordinate data. The coordinate data 59 stores X and Y coordinate values forming a figure.

The operator inputs the updated portion from the corrected drawing set in the digitizer 21 (step 205) until all the updating is completed (step 204), and the updated data is held in the work file 11 (step 2).
06). For example, when there is road expansion work, the position of a new road boundary is input, and this data is held in the work file 11. When the input of the updated portion is completed (step 204), the application program 9 saves the updated data in the work file 11 in the database 7 (step 207).

Next, communication between the slave station and the master station will be described with reference to FIGS.
A description will be given according to the flowchart of FIG. The address to be searched is input from the pen input personal computer 29 on the slave station side (step 301), and the drawing number corresponding to the address is input to the target address (step 302). Pen input PC 29
Searches the optical disk 15 for the terrain layer record of the inputted drawing number (step 303) and extracts it into the work file of the pen input personal computer 29 (step 30).
4) Display the contents of the work file (step 3)
05).

Therefore, in this case, the pen input personal computer 2
In Fig. 9, only topographical data is displayed, and equipment data such as gas pipes are not displayed. The operator specifies the search range F with the pen 31 on the displayed screen (step 30).
6). The pen input personal computer 29 converts the search range F specified by the pen 31 into the coordinate values of four points (step 30).
7). Further, the operator designates a target layer, and the pen input personal computer 29 creates the cutout data 61 including the update date and time and the search range F and transmits it to the master station 1 (step 3
08).

FIG. 9 is a diagram showing the display contents on the slave station side in this state. The search ranges F1 and F2 are specified by the pen 31 on the map 73. For example, regarding F1,
(X1, Y1), (X2, Y2), (X3, Y3),
The coordinate values of the four points (X4, Y4) enter the search range 69 of the cut-out data 61.

FIG. 7 is a record format diagram of the cut-out data 61. The cutout data 61 is the drawing number 63,
It is composed of a layer A65, a layer B67, and a search range 69.
The drawing number 63 contains the drawing number including the search range F, and the layers A65 and B67 contain the layer type and the update date and time of the data forming the drawing. The search range 69
Coordinate values of four points representing the search range F specified by the pen 31 are entered.

On the side of the master station 1, when the cutout data 61 transmitted from the slave station is received (step 309), the application program 9 sends the graphic data corresponding to the drawing number 63 of the cutout data 61 from the database 7 to the work file 11 For each record (step 31)
0). It is determined whether or not the extracted graphic data is included in the search range F (step 311), and if it is included, the update date and time of the extracted graphic data and the update date and time of the cutout data 61 are compared (step 312). Cutout data 61
If the updated date and time is older (step 313), the extracted graphic data is saved in the work file 11 as transmission data (step 314), and the processes from step 310 to step 314 are repeated until all graphic data are extracted. (Step 315) When all the graphic data corresponding to the drawing number 63 of the cut-out data 61 is extracted from the database 7, the graphic data stored as the transmission data in the work file 11 is transmitted to the slave station 2-1 (step 316). .

When the graphic data extracted in step 311 is not included in the search range F, or the cut-out data 61
If the update date and time of is newer, data 7 indicating no update
1 is transmitted to the slave station (step 317). FIG. 8 is a record diagram of the data 71 indicating no update.

The slave station side judges whether or not there is an update (step 318). If there is an update, the graphic data sent from the master station 1 is expanded into a work file of the pen input personal computer 29 (step 319). The contents of the work file of the personal computer 31 are displayed (step 320).

If there is no update, the optical disk 15 on the slave station side
The contents extracted from the pen input personal computer 29 are displayed in the work file.

FIG. 10 is a diagram showing topographical data having an updated portion on the master station side. Comparing FIG. 9 and FIG. 10, the portions E1, E2, and E3 are updated. FIG.
1 is an enlarged view of a portion F1 in FIG. 12 is shown in FIG.
It is an enlarged view of F1 part of 0. FIG. 13 shows a record of graphic data representing FIG. Line type flags 86-1, 8
6-2 and 86-3 include, for example, "-1" indicating a solid line, "-16" indicating a jump process, and "-99" indicating an end.
9 ”is entered. FIG. 14 is a diagram showing a record of graphic data representing FIG.

That is, FIG. 13 shows a record of the terrain data within the search range F1 when the slave station side has designated the search range F1, and FIG. 14 shows the updated terrain data sent from the parent station as a child. This shows the record on the slave station side when it is displayed on the station side. In this case, the child station side once deletes the record shown in FIG. 13 and displays the record shown in FIG.

As shown in FIG. 15, there is also a method of adding without deleting. By inserting "-512" indicating the hidden line processing in the line type flag 89-1, the data shown in FIG. 13 is displayed in the same color as the background on the display screen, and the line type flag 89-3 indicates "-". 1 ”, only the data shown in FIG. 14 becomes, as shown in FIG.
It will be displayed on the display screen.

As described above, according to the present embodiment, the master station and the slave station each have graphic data, and by checking the update date of the graphic data, the minimum data is transmitted and the transmission time is shortened. can do.

In the above-described embodiment, as shown in FIG. 16, all the graphic data 81 including the search range 69 is directly transmitted from the master station 1 to the slave station (Japanese Patent Laid-Open No. 5-1).
08729), as shown in FIG. 17, intersections 83-1 and 83-2 of the search range 69 and the graphic data 81 may be obtained, and only the part of the graphic data 81 related to the search range 69 may be transmitted (special feature). Hei 4-72953).

Further, as shown in FIG. 18, graphic data 8
As for the coordinate points that make up No. 1, the minimum portion represented by the coordinate points 85-1 to 85-2 of the graphic data included in the search range 69 may be transmitted (Japanese Patent Application No. 5-112775). ).

Further, in the above-described embodiment, as shown in FIG. 19, the rectangular search range F has four points A, B, C and D at four corners.
However, as shown in FIG. 20, the coordinates may be represented by two points A1 and C1 on the diagonal which are the minimum value and the maximum value of the coordinates forming the search range F. Further, as shown in FIG. 21, the search range F may be represented by the lengths 87 and 89 of two sides of a rectangle and the minimum coordinate value A2 of the rectangular area which is the intersection of these two sides.

In the above-described embodiment, an example in which the slave station 2 has the master station 1 and the slave station 2 and the slave station 2 searches the graphic data by the optical disk 15 has been described. That is, the data communicated via the communication line 26 is cut-out data, updated data, or other data with a small communication volume.

FIG. 22 shows a distributed system, which comprises a plurality of workstation systems 9.
, 91-n are connected by a communication line 95, and each workstation system 91 has area-divided graphic data.

For example, the workstation system 91-
i will be explained. Workstation system 9
1-i is a workstation 101, a magnetic disk 10
3, an optical disk 109, a magnetic disk 115, a terminal device 121, and a digitizer 123. The magnetic disk 103 is divided into regions and holds graphic data (self-management data 105) assigned to itself. The optical disk 109 is for other workstation management data 111,
113, ... The other workstation management data 111 is, for example, the workstation system 9
The optical disk is sent from 1-1 every fixed period (for example, once a year), and the workstation system 91-1
The graphic data assigned to is written. Similarly, for other workstation management data 113,
The graphic data assigned to the workstation system 91-2 is written by being sent from the workstation system 91-2 by an optical disc at regular intervals. The workstation system 91-i is connected to another workstation system via the modem 93 and the communication line 95.

For example, the workstation system 91
In the case of retrieving the graphic data assigned to another workstation system 91-1 by -i, the retrieval range is specified by the workstation system 91-i and the cutout data is sent to the workstation system 91-1 to The station system 91-1 determines whether there is updated data within the search range, and if there is updated data, the workstation system 9
This updated data is sent to 1-i.

[0033]

As described above in detail, according to the present invention, in the communication of graphic data, the transmission / reception time can be shortened by transmitting / receiving the minimum amount of data.

[Brief description of drawings]

FIG. 1 is a diagram showing a hardware configuration of a graphic data transmission system according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a data update process in the master station.

FIG. 3 is a flowchart showing communication processing between a child station and a parent station.

FIG. 4 is a flowchart showing communication processing between a child station and a parent station.

FIG. 5 is a flowchart showing communication processing between a child station and a parent station.

FIG. 6 is a record format diagram of the graphic data 51.

FIG. 7: Cutout data 61 record format diagram

FIG. 8 is a diagram showing a record of data 71 indicating no update.

FIG. 9 shows a map that has not been updated

FIG. 10 is a diagram showing an updated map.

FIG. 11 is an enlarged view of an F1 portion shown in FIG.

FIG. 12 is an enlarged view of an F1 portion shown in FIG.

13 is a diagram showing a record of data representing FIG.

FIG. 14 is a diagram showing a record of data representing FIG.

FIG. 15 is a diagram showing a record of data representing FIG.

16] A search range 69 and graphic data 81 to be transmitted
Diagram showing the relationship with

17] A search range 69 and graphic data 81 to be transmitted
Diagram showing the relationship with

FIG. 18: Search range 69 and graphic data 81 to be transmitted
Diagram showing the relationship with

FIG. 19 is a diagram showing a search range F

FIG. 20 is a diagram showing a search range F

FIG. 21 is a diagram showing a search range F

FIG. 22 is a diagram showing a hardware configuration of a distributed graphic data transmission system.

[Explanation of symbols]

1 ... Master station 2-1, 2-2, 2-3 ......... Slave station 3 ... Host computer 7 ... Database 9 ... Application program 11 ... Work file 15 ... Optical disk 21 ... Digitizer 25, 27 …… Modem 26 ………… Communication line 29 ………… Pen input PC 69 ………… Search range 91-1, 91-i, 91-n ……… Workstation system

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Claims (22)

[Claims] 1. A system comprising a master station and a slave station, wherein the master station comprises: a database for storing graphic data; an updating unit for updating the graphic data by adding an update date and time; In a system having a means for transmitting all the graphic data of each of the graphic data to a slave station at predetermined intervals, the slave station having a display means for displaying all the graphic data transmitted from the master station, wherein the slave station is There is a means for designating a search range and sending the search range and the update date and time to the master station, and the master station receives the search range and the update date and time sent from the slave station, and the master station Means for comparing the update date and time of the side and the update date and time sent from the slave station to determine whether updated graphic data exists within the search range, and graphic data updated within the search range Is updated if it exists Means for sending the graphics data to the slave station, the slave station is graphic data transmission system characterized by comprising a display means for displaying the graphic data updated transmitted from said master station. 2. The graphic data transmission system according to claim 1, wherein the graphic data is topographical data and facility data. 3. The means for sending all the graphic data in the database to a slave station every predetermined period, the master station writes all the graphic data in an external storage device and sends the external storage device to the slave station. The graphic data transmission system according to claim 1, which is characterized in that. 4. The graphic data transmission system according to claim 1, wherein the search range is specified by coordinate values of points at four corners of the rectangular area. 5. The graphic data transmission system according to claim 1, wherein the search range is specified by coordinate values of two points forming a diagonal line of the rectangular area. 6. The search range is two adjacent rectangular areas.
The graphic data transmission system according to claim 1, wherein the graphic data transmission system is specified by the length of one side and the coordinate value of the intersection of the two sides. 7. The graphic data transmission system according to claim 1, wherein the updated graphic data sent from the master station to the slave station is the graphic data itself held in the database. 8. The updated graphic data sent from the master station to the slave station is held in the database, and among the graphic data represented by the point coordinates, an intersection with the search range is calculated, and the intersection is calculated. 2. The graphic data transmission system according to claim 1, wherein the end point is a point coordinate sequence existing in the search range. 9. The updated graphic data sent from the master station to the slave station is the minimum number of point coordinate sequences including the search range among the graphic data represented by the point coordinates held in the database. The graphic data transmission system according to claim 1, wherein 10. The graphic according to claim 1, wherein the display means of the slave station displays the updated graphic data sent from the master station after deleting the graphic data within the search range. Data transmission system. 11. The display means of the slave station displays the graphic data in the search range as a background color and displays the updated graphic data sent from the master station. Graphic data transmission system. 12. A system comprising a plurality of stations,
Each station has a database for storing geographically divided graphic data, an updating means for updating the graphic data by adding an update date and time, and a means for sending the graphic data in the database to another station at predetermined intervals. In a system having display means for displaying graphic data sent from another station, the first station has means for designating a search range and sending the search range and update date and time to the second station. Then, when the second station receives the search range and the update date and time sent from the first station, it compares the update date and time of the second station with the update date and time sent from the first station. Means for determining whether or not updated graphic data exists within the search range; and when updated graphic data exists within the search range, the updated graphic data is set to the first Means for sending to a station; Stations, figure data transmitting system characterized by comprising a display means for displaying the graphic data updated transmitted from the second station, the. 13. The graphic data transmission system according to claim 12, wherein the graphic data is topographical data and facility data. 14. means for sending the other stations all graphic data for each predetermined period in said database, by writing all graphic data in the external storage device at each station, and sends the external storage equipment to other stations 13. The graphic data transmission system according to claim 12, wherein 15. The search range is specified by coordinate values of points at four corners of a rectangular area.
The graphic data transmission system described in 2. 16. The graphic data transmission system according to claim 12, wherein the search range is specified by coordinate values of two points forming a diagonal of a rectangular area. 17. The graphic data transmission system according to claim 12, wherein the search range is specified by lengths of two sides of the rectangular area and coordinate values of intersections of the two sides. 18. The graphic data transmission according to claim 12, wherein the updated graphic data sent from said second station to said first station is the graphic data itself held in said database. system. 19. The updated graphic data sent from the second station to the first station is held in the database, and the intersection of the graphic data represented by the point coordinates with the search range is calculated. However, it is a point coordinate sequence existing in the search range with the intersection as an end point.
The graphic data transmission system described in 2. 20. The updated graphic data sent from the second station to the first station is point coordinates including the search range, among the graphic data indicated by the point coordinates held in the database. A column as a column.
The graphic data transmission system described in 2. 21. The display means of the first station deletes the graphic data within the search range and then displays the updated graphic data sent from the second station. 12. The graphic data transmission system described in 12. 22. The display means of the first station displays the graphic data within the search range in a background color, and displays the updated graphic data sent from the second station. Item 12. The graphic data transmission system according to item 12.