KR100647412B1 - Apparatus and Method for generating Image map and controlling Communication of Image map - Google Patents

Abstract

According to the present invention, an electronic map request is received from a multi-client, stacked in a queue, taken out sequentially, and a map is generated, and an electronic map image screen is generated by combining data included in a corresponding area in real time, and then compressed and transmitted to the client. Apparatus and method for generating map image transmission and reception,

Electronic map image transmission and reception control means for receiving an electronic map image generation request from a client and temporarily storing the electronic map image generation request in a sequential queue, sequentially transmitting the temporary stored request, and delivering the generated image to the client; Map data management means for reading the vector data necessary for generating the electronic map image from the spatial database management system managing the electronic map in response to the first electronic map image generation request and constructing an internal index map; Map generation means for reading a requested electronic map through the map data management means and generating a map image in the form of a pixmap; And a compression means for compressing the generated pixmap type map image into a GIF image and transferring the requested electronic map image to the transmission and reception control means.

Electronic Map, Image Drawing, Image Drawing Compression, Image Generation, Image Transfer Control

Description

Apparatus and Method for generating Image map and controlling Communication of Image map}             

1 is an exemplary configuration diagram of a multi-client environment to which the present invention is applied.

Figure 2 is a configuration diagram of an embodiment of the electronic map image generation and transmission and reception control apparatus according to the present invention.

Figure 3 is a hierarchical explanatory diagram of an embodiment of the electronic map image generation and transmission and reception control apparatus according to the present invention.

Figure 4 is a detailed configuration diagram of an embodiment of the electronic map image generating unit according to the present invention.

Figure 5 is a detailed configuration diagram of an embodiment of the electronic map image transmission and reception control unit according to the present invention.

6 is a flowchart illustrating an embodiment of a method for generating and transmitting / receiving an electronic map image according to the present invention.

7 is a detailed flowchart of an embodiment of an electronic map image generation process according to the present invention;

8 is a detailed flowchart of an embodiment of an electronic map image transmission and reception control process according to the present invention;

* Explanation of symbols for the main parts of the drawings

201: Electronic map image transmission and reception control unit

202: electronic map image generator

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic map image generation and transmission control apparatus, a method thereof, and a computer readable recording medium recording a program for realizing the method. Particularly, a geographic information system (GIS) in a client / server environment is provided. ) An electronic map image generation and transmission and reception control apparatus and method for providing the electronic map drawing essential to providing an application service from a spatial database management system (DBMS), and a method thereof and a method for realizing the method. A computer readable recording medium having recorded a program.

The technical field of the present invention is to provide a map screen that is essential when developing a GIS-based application service system. The prior art in this field is largely based on a vector data processing method and a pre-generated electronic map image providing method. Divided.

In the former case, a map screen is composed of predetermined symbols and lines by reading vector data belonging to a specific area from a server. The accuracy is high and the quality of the displayed screen is also excellent. However, the first consideration when reading vector data from a large spatial DBMS from a server is network transmission speed, so this is not a problem when the area you want is small and the number of vector data contained in it is small. If requested, the number of vector data contained in it is too large, causing a slowdown on a general network.

On the other hand, in the latter case, all the images are made by scale and the screen is made and sent at the request of the user. In the latter case, a user screen must be created after merging and cutting several pieces of artificially cut images. Since images are also fixed by scale, screen control is unnatural.

The present invention has been made to solve the problems described above, by receiving an electronic map request from a multi-client, stacked in a queue and sequentially pulled out to create a map and combines the data contained in the area in real-time An object of the present invention is to provide an electronic map image generation and transmission / reception control apparatus for generating, compressing, and transmitting an electronic map image screen to a client, and a computer-readable recording medium recording a program for realizing the method.

An apparatus of the present invention for achieving the above object, the electronic map for receiving the electronic map image generation request from the client in the sequential queue, and sequentially deliver the temporary stored request, the electronic map for delivering the generated image to the client Image transmission and reception control means; Map data management means for reading the vector data necessary for generating the electronic map image from the spatial database management system managing the electronic map in response to the first electronic map image generation request and constructing an internal index map; Map generation means for reading a requested electronic map through the map data management means and generating a map image in the form of a pixmap; And compressing means for compressing the generated pixmap type map image into a GIF image to deliver the requested electronic map image to the transmission and reception control means.

In addition, the method of the present invention is an electronic map image generation and transmission and reception control method applied to the electronic map image generation and transmission and reception control apparatus, comprising: a first step of receiving an electronic map image generation request from a client and temporarily storing it in a sequential queue; A second step of sequentially reading the electronic map image generation request stored temporarily in the sequential queue and checking whether there is an error for Geographic Information System (GIS) information in the request; A third step of constructing an internal index map by reading vector data necessary for generating an electronic map image from a database in response to an error-free first electronic map image generation request; A fourth step of reading the requested electronic map from a database and generating a map image in the form of a pixmap; And a fifth step of compressing the generated map image in the form of a pixmap into an image in the form of GIF.

In addition, the present invention, the high-capacity processor, the first step of receiving the electronic map image generation request from the client to temporarily store in the sequential queue; A second step of sequentially reading the electronic map image generation request stored temporarily in the sequential queue and checking whether there is an error for Geographic Information System (GIS) information in the request; A third step of constructing an internal index map by reading vector data necessary for generating an electronic map image from a database in response to an error-free first electronic map image generation request; A fourth step of reading the requested electronic map from a database and generating a map image in the form of a pixmap; And a computer-readable recording medium having recorded thereon a program for executing the fifth step of compressing the generated pixmap type map image into a GIF type image and delivering the same to the client.

 The electronic map image generation method proposed by the present invention uses a method in which the electronic map request processing server generates and compresses the electronic map image screen by combining data included in the corresponding area in real time with respect to the map request of the client and transmitting the compressed image to the client. Because of the complexity of the map can be a little different, but a relatively constant size can be transmitted. Therefore, the transmission speed is kept almost constant, and the application system developer needs to receive the image file of the requested area from the server and display it as it is, thereby minimizing the burden of developing the map processing graphic system and reducing the development period. Can be. In addition, it is very easy in terms of map management since there is no need to regenerate an image when changing an electronic map.

According to the present invention, the map data processing according to the development of the GIS application system is provided by allowing the server to quickly and stably receive an image necessary for constructing a corresponding map screen when requesting continuous zoom movement of client users necessary to provide a GIS application service. In addition to reducing the burden on developers and shortening the development period, the electronic map display management will be promoted.

An object of the present invention is to provide a method in which a server process generates and transmits a corresponding electronic map screen in real time by analyzing an electronic map request signal that occurs irregularly and continuously in a multi-client environment. Therefore, even if the server and client processes are terminated in an unexpected situation, it manages a transmission and reception control device and an electronic map database (DB: DataBase) that can provide uninterrupted service by detecting and automatically restarting and recovering. An electronic map image generating device technology for generating a digital map image drawing based on a map DB retrieved from a spatial DBMS is included.

The present invention has a network server monitor that detects irregular and continuous digital map image requests in a client / server environment, and this monitor sequentially processes the electronic map generation process while recording the request details of individual clients in a sequential queue. It generates and compresses an image drawing and sends it to the requesting client. The client sends a character stream containing information about the area of the requested electronic map and the layer (class) information of the electronic map that it wishes to show, specific to the Transmission Control Protocol / Internet Protocol (TCP / IP). After the socket is loaded, the client receives an image drawing from the server and displays it on the screen.

The server monitor included in the present invention is a transmission / reception control apparatus that handles transmission and reception in a client / server environment, and not only handles the normal operations mentioned above, but also detects abnormally terminated client and server operations, and automatically executes and recovers them. It also includes the ability to provide uninterrupted service delivery.

In the present invention, the time required to generate the entire image can be reduced by loading all the electronic map elements included in the spatial DBMS and applying the in-memory index map technique when the electronic map image generating apparatus is initially driven.

In addition, the present invention is designed to increase the readability of the electronic map as much as possible by allowing the client to adjust the layers by scale when requesting the electronic map.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an exemplary configuration diagram of a multi-client environment to which the present invention is applied.

1 shows a configuration of a general GIS system in a multi-client environment. Client A (101) requests a national map, client B (102) requests a Seoul map, and client C (103) requests a Daejeon metropolitan city map, and server 104 requests the electronic map space according to these client requests. The DBMS 105 is searched and the electronic map is transmitted to the corresponding client.

2 is a block diagram of an electronic map image generation and transmission and reception control apparatus according to the present invention.

2 illustrates an example of requesting an electronic map from the client of the GIS application system to the electronic map image transmission / reception control unit 201, and generating and transmitting an image from the electronic map image generation unit 202 to the client.

When the client requests the electronic map, the electronic map image transmission / reception control unit 201 in the server receives the request signal, accumulates them in the queue sequentially, and generates the image through the electronic map image generation unit 202 which sequentially generates the corresponding client. Send and receive again.

The electronic map image transmission / reception control unit 201 enables uninterrupted service provision by detecting and automatically re-executing and recovering even when the server and client processes are terminated in an unexpected situation.

The electronic map image generator 202 generates an electronic map image drawing based on the map DB retrieved from the spatial DBMS managing the electronic map database.

3 is a hierarchical explanatory diagram of an electronic map image generation and transmission and reception control apparatus according to the present invention. The present invention comprises an electronic map image generation unit 301 and an electronic map image transmission and reception control unit 302.

The electronic map image generation and transmission / reception control apparatus is based on TCP / IP for communication, based on UNIX, and based on the GEUS spatial DBMS. Of course, this is not an example but an example.

The electronic map image generator 301 generates an electronic map image by using the electronic map data included in the process by referring to the electronic map image generation information requested by the user by a command of the electronic map image transmission / reception control unit 302. After generating the map image, the electronic map image transmission and reception control unit 302 notifies this to complete a work execution cycle.

The electronic map image transmission / reception control unit 302 requests the electronic map image generation unit 301 to sequentially generate the electronic map image by referring to the queue and transmits the generated electronic map image to the corresponding client. At this time, if an error occurs in the interface on the network, it logs the existing request, disconnects the client, and processes the next request.

4 is a detailed configuration diagram of an electronic map image generator according to an embodiment of the present invention.

The electronic map image generator 301 is composed of a map data manager 401, a map generator 402, and a map compressor 403.

The map data manager 401 of the electronic map image generating unit 301 reads all the vector data necessary for the generation of the electronic map image from the electronic map space DBMS managing the electronic map at the time of initial driving to prepare an internal index map. Do the work.

On the other hand, the map generator 402 analyzes the image drawing request details requested through the interface 504 with the electronic map image generator of the electronic map image transmission / reception control unit 302 and generates a pixmap type map image. .

The map compressor 403 compresses the first generated pixmap image into a GIF image and notifies the electronic map image transmission / reception control unit 302 of the result.

5 is a detailed configuration diagram of an electronic map image transmission and reception control unit according to the present invention.

FIG. 5 is a block diagram of the electronic map image transmission / reception control unit 302 of FIG. 3, which includes a master server 501 and an electronic map image generator including an interface 502 with a client and a sequential queue scheduler 503. The interface 504 of the.

The master server 501 of the electronic map image transmission / reception control unit 302 verifies the request contents of the client on the basis of the electronic map data on the network, and an error occurs. In this case, an error message for the request is sent to the client.

In addition, in the interface 502 with the client, if a protocol for interface processing with the client does not exist or an error occurs in the interface on the network, the log is recorded for the existing request and the connection with the client is terminated to process the next request. Will be

In addition, by accumulating user requests in a sequential queue through the scheduler 503 and driving the electronic map image generator 301 through the interface 504 with the electronic map image generator, the corresponding image generated by the client is transferred to the client. Will be sent.

6 is a flowchart illustrating an electronic map image generation and transmission and reception control method according to the present invention.

6 is a flowchart illustrating an electronic map image generation and transmission / reception control method according to an embodiment of the present invention, in which an electronic map image transmission / reception control unit is driven 601 and a master server 501 of the electronic map image transmission / reception control unit 302 is driven. Master server 501 waits for a client request through an interface with the client (602). The client checks whether there is a request from the client (603), and if the client makes any request, the client first stores the request in the sequential queue (604) and checks the client's request in the sequential queue (605).

As a result of the check, if there is no request from the client, the sequential queue scheduler 503 checks the request of the client in the sequential queue (605), and if there is no request in the sequential queue, checking whether there is a request from the client ( 603) is repeated.

As a result of checking the request of the client in the sequential queue, if a request exists in the sequential queue, an error check is performed on the GIS information of the request content to determine whether an error exists (606). As a result of the determination, if an error exists, an error message is transmitted to the corresponding client (607), and the process is repeatedly performed (603) to check whether there is a request from the client.

As a result of error checking on the GIS information of the request contents, if there is an error, if the error does not exist, it is checked whether the request is an image generation request (608). As a result of the inspection, if the request of the client is not an image generation request, it is checked whether the electronic map image transmission / reception control unit 302 is an end request (609). As a result of the check, if it is not the end request, the process repeats the process 607 of transmitting an error message to the corresponding client.

As a result of confirming that the request of the client is the termination request of the electronic map image transmission / reception control unit 302, if the termination request of the electronic map image transmission / reception control unit 302 is terminated, the electronic map image transmission / reception control unit 302 is terminated.

As a result of checking whether the request is an image generation request, if the request is image generation, it is checked whether the request is an initial image generation request (611). If it is confirmed that the initial image generation request is performed, the GIS information is loaded (612), and the electronic map image generator 301 is driven (613).

The electronic map image generator 301 checks whether the electronic map image is properly generated (614). As a result of the check, if the electronic map image is not properly generated, the process is repeatedly performed in step 607 of transmitting an error message to the corresponding client.

 As a result of checking whether the electronic map image is properly generated by the electronic map image generating unit 301, if the image is properly generated, the electronic map image generating unit 301 transmits the image again to the corresponding client through an interface with the client, and the electronic map image transmitting and receiving control unit 302 After notifying the process of generating the electronic map image to the mobile station, the process repeatedly checks whether there is a request from the client (603).

Consecutive image requests received from multiple clients are managed by the sequential queue scheduler 503. The electronic map image generation unit 301 generates an electronic map image by using the electronic map data included in the process by referring to the image generation information requested by the user by a command of the electronic map image transmission / reception control unit 302. In addition, after generating the image, the electronic map image transmission and reception control unit 302 notifies the end of one work execution cycle.

7 is a detailed flowchart illustrating an electronic map image generation process according to the present invention.

FIG. 7 is a detailed flowchart illustrating an electronic map image generation process in the electronic map image generator 301 of FIG. 3 according to the present invention. In the first case, all vector data necessary for generating an electronic map image is read from the spatial DBMS to the map data manager 401. At this time, preparation work such as configuring an internal index map is performed.

When the preparation is completed, the map generator 402 is called to generate a map image in the form of a pixmap. The map compressor 403 compresses the first generated pixmap image into an gif-type image and ends the image generation process.

This is shown as follows in the flow of the drawing.

First, it is checked whether an error for the GIS information exists in the request content from the client (701). As a result of the check, if an error exists, error processing (702) and the image generation process are terminated.

As a result of checking whether there is an error for the GIS information in the request content from the client, if the error does not exist, it is determined whether the request content is an electronic map image generation request (703). If it is determined that the image is not a request for generating an image, error processing (702) is terminated.

As a result of determining whether the request is an electronic map image generation request, if it is an image generation request, it is checked whether it is the first electronic map image generation request (704). If it is the first image generation request, the GIS information is loaded into the map data manager 401 to generate the electronic map image (705), and the map generator 706 generates the electronic map image (706).

 As a result of checking whether it is the first electronic map image generation request, if it is not the first image generation request, the map generator 706 generates the electronic map image (706).

After generating the electronic map image, the map compressor 403 of the electronic map image generating unit 301 compresses the generated electronic map image (707), and confirms whether the electronic map image generation and compression have been performed correctly ( 708). As a result of the check, if the electronic map image generation and compression have not been correctly performed, error processing (702) is completed, and the electronic map image generation process is terminated.

As a result of confirming that the electronic map image generation and compression have been performed correctly, if the electronic map image generation and compression have been correctly performed, the electronic map image generation process is terminated.

8 is a detailed flowchart illustrating an embodiment of a transmission and reception control process according to the present invention.

8 is a detailed flowchart illustrating a transmission / reception control process in the electronic map image transmission / reception control unit 302 of FIG. 3 according to the present invention, when the master server 501 of the electronic map image transmission / reception control unit 302 is driven ( 801, after confirming the client request contents on the network (802), the request contents are stored in the sequential queue (803). Next, the sequential queue scheduler 804 reads client requests sequentially from the sequential queue, checks the sequential queue (804), determines whether the image is a creation request (805), and, in the case of an image generation request, the electronic map image generation unit ( In operation 806, a requested image is generated, and a result of the determination is checked, and it is checked whether the request is an end request for the electronic map image transmission / reception control unit 302 (809). As a result of the inspection, when the request for termination of the electronic map image transmission / reception control unit 302 is terminated, the electronic map image transmission / reception control unit 302 is terminated. Otherwise, it is an error, so that an error message is transmitted to the corresponding client (808), and the request of the client is received. Repeat the process from step 802 to confirm.

In the above embodiment, when an error occurs, an error message is transmitted to the corresponding client. If an interface for the protocol with the corresponding client does not exist or an error occurs at the interface on the network, the log for the existing request is recorded.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible in the art without departing from the technical spirit of the present invention. It will be clear to those of ordinary knowledge.

As described above, the present invention is prepared to read a vector data of an electronic map from a spatial DBMS so that a map can be generated at any time according to a user's request. Has been applied to the electronic map request stream transmission method through TCP / IP socket, which can greatly contribute to reducing the burden on the client program developer and shortening the development period.

In addition, the present invention, by reading all the electronic map DB from the spatial DBMS during the initial operation, and disconnected from the database, because it can operate regardless of other database transactions to access the database from other application systems Not only does it cause any impact, but it also makes DBMS operation management easy because it does not cause the effects of database read lock or slowdown according to the electronic map search that can occur from time to time.

In addition, since the present invention can operate on a system separate from the hardware system in which the spatial DBMS volume is installed, this method can be applied to improve the system performance.

In addition, the present invention, since the electronic map image file generated by the electronic map image generating unit has a much smaller variation in the size of the data compared to the task of sending and receiving vector data, and also applies a compression technique, it is possible to maintain a constant speed during service on a general network. There is a guaranteed effect.

In addition, the present invention has an effect that a client user requesting an electronic map image can select a digital map layer to be displayed for each scale of the screen map and adjust the display order of these layers by manipulating meta files on the client.

In addition, the present invention, by controlling the client and the image generation unit through the transmission and reception control has an effect that can provide a stable GIS application service by processing the synchronization and scheduling between them.

In addition, the present invention has the effect that it can be used in a variety of electronic map-based GIS applications in the client / server environment by supporting the electronic map can be provided from the server quickly and stably without having to implement a complex separate graphics program.

Claims (8)

delete delete Electronic map image transmission and reception control means for receiving an electronic map image generation request from a client and temporarily storing the electronic map image generation request in a sequential queue, sequentially transmitting the temporary stored request, and delivering the generated image to the client; Map data management means for reading the vector data necessary for generating the electronic map image from the spatial database management system managing the electronic map in response to the first electronic map image generation request and constructing an internal index map; Map generation means for reading a requested electronic map through the map data management means and generating a map image in the form of a pixmap; And And a compression means for compressing the generated pixmap type map image into a gif type image and transferring the requested electronic map image to the transmission and reception control means. The method of claim 3, wherein The electronic map image transmission and reception control means, Main processing means for verifying the request content of the client based on the electronic map data to notify the client of an unprocessable error, correcting the processable error to request image generation, and delivering the generated electronic map image to the client ; And First interface processing means for processing a connection between the main processing means and the electronic map image generating means Electronic map image generation and transmission and reception control device comprising a. The method of claim 4, wherein The main processing means, If the interface with the client does not exist and the interface with the client does not exist or an error occurs in the interface on the network, a log is recorded for the existing request. 2 interface processing means; And A scheduling means for accumulating user requests in a sequential queue and taking them out sequentially so that the electronic map image is generated through an interface with the electronic map image generating means, and transmitting the generated electronic map image to the client. Electronic map image generation and transmission and reception control device comprising a. In the electronic map image generation and transmission and reception control method applied to the electronic map image generation and transmission and reception control device, A first step of receiving an electronic map image generation request from a client and temporarily storing the electronic map image generation request in a sequential queue; A second step of sequentially reading the electronic map image generation request stored temporarily in the sequential queue and checking whether there is an error for Geographic Information System (GIS) information in the request; A third step of constructing an internal index map by reading vector data necessary for generating an electronic map image from a database in response to an error-free first electronic map image generation request; A fourth step of reading the requested electronic map from a database and generating a map image in the form of a pixmap; And A fifth step of compressing the generated pixmap type map image into a GIF image and delivering it to the client; Electronic map image generation and transmission control method comprising a. delete On a large processor, A first step of receiving an electronic map image generation request from a client and temporarily storing the electronic map image generation request in a sequential queue; A second step of sequentially reading the electronic map image generation request stored temporarily in the sequential queue and checking whether there is an error for Geographic Information System (GIS) information in the request; A third step of constructing an internal index map by reading vector data necessary for generating an electronic map image from a database in response to an error-free first electronic map image generation request; A fourth step of reading the requested electronic map from a database and generating a map image in the form of a pixmap; And A fifth step of compressing the generated pixmap type map image into a GIF image and delivering it to the client; A computer-readable recording medium having recorded thereon a program for executing the program.

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