KR20020054238A - Component System for Distributing Geographic Information System and Method of it - Google Patents

Abstract

PURPOSE: A distributed geographic information processing component system and method are provided to construct a GIS(Geographic Information System) with components of standard interfaces for accessing or using geographic data stored at a heterogeneous database by a single method so that the system is reusable and interoperable. CONSTITUTION: The system comprises an application program(310), an OLE/COM(Object Linking and Embedding/Component Object Model) interface(320), a map base component(330), an extended OLE/DB(Object Linking and Embedding/Database) interface(340), and a data provider component(350). The application program(310) is necessary to integrate heterogeneous GIS or acquire geographic data from other GIS. The PLE/COM interface(320) exposes externally functions owned by a component. The map base component(330) extracts core common functions needed for being applied to various applications, and exposes externally them. The extended OLE/DB interface(340) is made by adding a GIS interface to the Microsoft OLE/DB interface. The data provider component(350) converts unique type of data stored at each data source into standard WKB(Well Known Binary) type data, and offers the converted data to a client.

Description

Component System for Distributing Geographic Information System and Method of it}

The present invention consists of a Geographic Information System (GIS) consisting of components composed of standard interfaces to access and utilize geographic data stored in heterogeneous databases in a single way, thereby reusable and interoperable. A distributed geographical information processing component system and a method thereof and a computer-readable recording medium having recorded thereon a program for realizing the method.

The Geographic Information System (GIS) construction project in Korea began in 1995 with the leading positions in Seongnam, Gwangju, and Seoul, Busan, Jeju, Gangwon, and Daejeon. In addition, each developed task is building spatial database systems or information systems using different geographic information system software in different areas according to the unique characteristics of each municipality such as water supply, sewerage, roads, land, and city planning. As a result, integrated management is not possible.

Therefore, if 78 local governments or more than hourly wages are introduced separately without considering integrated management, the application system development costs more than KRW 409.2 billion. This situation is inevitably inevitable.

FIG. 1 is an exemplary configuration diagram of a general geographic information system, which shows the inability to share between currently developed geographic information systems.

As shown in FIG. 1, the reason why the application system cannot be shared in the software sector including the geographic information system is as follows.

First, in the absence of a common standard, software developers cannot easily include components developed by others in their software.

Second, the demands on application systems are increasing, making the structure and function of software increasingly complex.

Third, there is a limit to the recycling of modules made in the past due to the rapid development of computer language and related technologies.

Fourth, the computing environment is rapidly changing and difficult to respond quickly.

For these reasons, there is no time to exchange modules between existing geospatial information systems, and there is a time and economic inefficiency that requires re-development of the same modules as other systems to develop the necessary application systems. have.

In order to solve such a realistic problem, the following solution was proposed, but there were still problems.

First, as a method for integrated management between heterogeneous systems, which are currently common, a common geographic information system data format is used. For example, when it is necessary to integrate and manage sewage network and communication network for water construction in the water supply management system, each data of the sewage management system and communication network management system is converted into a common format and converted into a water supply management system. I'm using the read method. However, this method hinders the redundancy of the data and the correspondence between the data. In other words, the water supply management system has a copy of the sewer network and the communication network, so the capacity of the data can be greatly increased and the performance of the database can be degraded. There is a drawback to being absent.

FIG. 2 is a diagram illustrating an integrated management method through data exchange using a common data format in a general geographic information system, and illustrates a method of integrated management through data exchange using a common format.

Second, it is a method of unifying geographic information system software that builds each work system. However, this method wastes enormous cost and time to newly build the existing system. In addition, maintenance costs are expected to increase due to monopoly in the future when unified software is selected, that is, technological subordination hinders the improvement of GIS technology and friction with unselected companies. There is also an additional cost for integration between each business system.

Third, a method using an integrated database system. In this method, all data used in each work system is stored in the central data server and used in each work system. The central data server includes all kinds of spatial data and related attribute data, and the system in charge of each task is connected to the central data server. This method has the advantage of excellent data maintenance and consistency and stability because data is stored and managed centrally, but all business systems can access the central data server, causing communication failure due to excessive data communication. Excessive workload on the system can overload and render the entire system unusable. In addition, it takes considerable time and money to unify the geographic information system software that builds each of the work systems.

The present invention has been proposed to solve the above-mentioned problems. The present invention comprises an open geographic information system for sharing data, and is composed of components that provide such a function through a standard interface. An object of the present invention is to provide an interoperable distributed geographic information processing component system capable of easily implementing a geographic information system, and a method thereof and a computer readable recording medium for realizing the method.

1 is an exemplary configuration diagram of a general geographic information system.

FIG. 2 is a diagram for explaining an integrated management method through data exchange using a common data format in a general geographic information system. FIG.

3 is a block diagram of an embodiment of a distributed geographic information processing component system according to the present invention;

4 illustrates one embodiment of a distribution system in accordance with the present invention.

5 is an exemplary explanatory diagram of an integrated geographic information system according to the present invention.

6 is a flow diagram of an embodiment of a data processing method of a distributed system using a component according to the present invention;

* Explanation of symbols for the main parts of the drawings

310: application program 320: OLE / COM interface

330: MapBase component 340: Extended OLE / DB interface

350: data provider component

Apparatus of the present invention for achieving the above object, in the geographic information processing component system for providing a geographic information service, an application for integrated management of heterogeneous geographic information systems or to obtain geographic data held in other geographic information systems Programming means; Data provider component means for connecting to a data source and converting data in a unique format stored in each data source into a standard format for providing to a client; MapBase component means for extracting geographic information from the data provider component means and exposing it to the outside through a standard interface; First interfacing means for exposing a function possessed by said MapBase component means to the outside; And second interfacing means for interfacing the data provider component means and the MapBase component means.

On the other hand, the method of the present invention is a data processing method applied to a geographic information processing component system, comprising: a first step of acquiring information about a data source and connecting to the data source; A second step of determining whether a connection to the data source was successful; A third step of outputting an error message and acquiring information on the data source of the first step if the connection is not successful as a result of the determination of the second step; A fourth step of acquiring spatial data and attribute data and converting the data into geometry if the connection is successful as a result of the determination of the second step; And a fifth step of storing the geometry in an internal memory and outputting the image to a screen.

On the other hand, the present invention provides a geographic information processing component system having a large capacity processor, comprising: a first function of obtaining information about a data source and connecting to the data source; A second function of determining whether a connection to the data source was successful; A third function of outputting an error message and obtaining information on a data source of the first function if the connection is not successful as a result of the determination of the second function; A fourth function of acquiring spatial data and attribute data and converting the data into geometry if the connection is successful as a result of the determination of the second function; And a computer-readable recording medium storing a program for realizing a fifth function of storing the geometry in an internal memory and outputting the image to a screen.

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.

3 is a block diagram of an embodiment of a distributed geographic information processing component system according to the present invention.

As shown in FIG. 3, a distributed geographic information processing component system includes an application 310 and a component required for integrated management of heterogeneous geographic information systems or for obtaining geographic data held by other geographic information systems. OLE / COM (Object Linking and Embedding / Component Object Model) interface (320) to expose the functions that they have to the outside, and extracts the core common functions needed to apply to various application tasks in geographic information system MapBase component 330, which implements the interface to be exposed to the outside, OLE / DB (Object Linking and Embedding /) that adds an interface for geographic information system to OLE / DB interface of "Microsoft". DataBase) interface 340, which connects to data sources and displays WKB (Well) data in a unique format stored in each data source. It includes a Data Provider Component 350, which converts into a standard format in the form of 'Known Binary' and serves to provide the client.

The application 310 implemented as a distributed system is used to integrate and manage heterogeneous geographic information systems or to acquire geographic data held by other geographic information systems. A representative example is local government. That is, when water supply work, sewerage service, road work, urban planning work, etc. are implemented using heterogeneous geographic information system application software, or when managing integrated work, the method and system of the present invention can be easily solved. I can solve it.

Moreover, it can apply suitably also in communication facility management. Currently, Korean telecommunications companies, Korea Telecom, Hanaro Telecom, and Dacom manage communication facilities using "GEUS", "SmallWorld" and "MapInfo". It is not possible to integrate and manage the communication facilities managed by the three companies, therefore, in this case, if the present invention is applied, the management system of the three communication companies can be used while maintaining the integrated management.

The OLE / COM interface 320 is a basic way for a component to expose its own functions to the outside, and one interface defines one or more methods (member functions) that provide a service. In other words, an interface is a contract between a component and a client application that uses it.

In the present invention, the "COM" Component Object Model (COM) protocol of "Microsoft" was used as a method of supporting the interface. This protocol supports all Windows environments and can be used free of charge, making it a very economical way at no cost.

MapBase component 330 is a component implemented to expose the standard interface to the outside by extracting the core common functions required to apply to various application tasks in the geographic information system. The typical function is to obtain the geographic information by accessing the geographic information presentation function and the data provider component that contains various geographic data.

The extended OLE / DB interface 340 is defined by the OpenGIS Consortium, the world's private standardization organization, and adds an interface for a geographic information system to an OLE / DB interface of "Microsoft." OLE / DB focuses on how to access data regardless of the data source. The OLE / DB interface is a promise between OLE / DB components and clients that use them to expose these capabilities to the outside world. Here, a data source is anything that has data and includes a database, a spreadsheet (eg, Excel), e-mail, and an indexed sequential access method (ISAM).

In addition, the data provider component 350 accesses a data source and converts data of a unique format stored in each data source into a standard format of Well-Known Binary (WKB), and provides the data to the client.

One data provider component must be implemented for one data source. The data provider component consists of a Data Source object, a Session object, a Command object, and a Rowset object.

FIG. 4 is an exemplary view illustrating a distributed system according to the present invention, and illustrates a distributed system in which a distributed system obtains geographic data by accessing a geographic information source generated by a heterogeneous geographic information system on a network and constructs an integrated geographic information system. .

As shown in FIG. 4, the distributed system includes an integrated geographic information system 410 that manages individual geographic information systems 420, 430, and 440, the integrated geographic information system 410, and the individual geographic information system ( A network (client / server environment) 420 connecting the 420, 430, and 440, and a separate geographic information system 420, 430, and 440 including geographic data.

The sewer management system 430 developed using "GEOMania" as the individual geographic information system 420, 430, 440, and the water management system 440 developed using "GEUS". , A road management system 450 built using "SDE".

The city planning system 410, which is the integrated geographic information system, integrates and manages systems constructed using different geographic information system software. Here, the internal structure of the city planning system is the same as that of FIG.

5 is an exemplary explanatory diagram of an integrated geographic information system according to the present invention, and illustrates a process of acquiring mutual geographic data through a network between heterogeneous geographic information systems using a data provider component.

As shown in FIG. 5, the sewerage management system 511 and the waterworks management system 521 are each an application program 310, an OLE / COM interface 320, a MapBase component 330, and the like. Extended OLE / DB interface 340, structure of the data provider component 350, each data provider component (512, 522) is the same as the data provider component 350 of Figure 3, each geographic data database 513 and 523 are produced by different geographic information system software, "GEOMania" and "GEUS".

6 is a flowchart illustrating an embodiment of a data processing method of a distributed system using a component according to the present invention.

First, information about a data source is obtained (601). In this case, the information is information about a data provider component registered in a registry of a computer currently being used, which can be input by a user or can be found by searching the registry.

The next step is to try to connect to the data source (602). Here, the information required for the connection is a data provider name, a database name, a user, a password, and the like. The data source 611 is accessed through the data provider 610 which is componentized. Since the data source 611 reads data in a single way without distinguishing whether it is located at a remote computer or a computer in use, it supports a distributed environment.

Once the connection is attempted (602), it is determined whether the connection was successful or failed (603).

As a result of the determination, when the connection fails, the process outputs an error message (608) and re-acquires information on the data source (601).

As a result of the determination, when the connection is successful, the spatial data and the non-spatial attribute data are acquired (604). In particular, the spatial data read from the data source is geometry in the form of Well-Known Binary (WKB), an international standard. The read WKB is converted into geometry to perform spatial operations and spatial searches freely (605) and stored in MapBase internal memory (606), and the stored data is displayed on the screen according to the characteristics and needs of the application. Is output 607.

The geometry used by WKB Geometry and MapBase internal data obtained from the data provider are different, and the ISC / IC 211 among international standardization bodies and "OpenGIS", the standardization organization in the GIS field, are different. Defined.

Therefore, the distributed system of the present invention can read data by accessing geographic data located in a remote computer as well as a computer in use through a data provider component, and by processing the read data in accordance with international standards. Using heterogeneous GIS software, geographic data produced, used and stored in different forms is processed in a unified form to provide interoperability between heterogeneous systems.

In addition, MapBase provides various mapping functions, multi-layer management functions, search functions, event processing functions, and so on, so that applications can use these functions to write programs to perform tasks appropriate for the user or task. Can be.

The present invention can be effectively applied to the work of general enterprises, local governments, and government departments that have established heterogeneous geographic information systems as well as the general public using geographic information systems, but are in need of integrated management.

The open geographic information processing distributed system according to the present invention accesses a heterogeneous database in which geographic data is stored, acquires geographic data, receives it in the form of standard WKB (Well Known Binary), and converts it into geometry. Get geographic data by accessing heterogeneous geographic information system in real time regardless of GIS S / W for information system construction. Therefore, no duplication of data occurs and the consistency between the data is maintained.

Therefore, the system developed using the method proposed in the present invention can access the heterogeneous geographic information system freely as if it is its own database and read the data. Work with the system can also continue.

As described above, the method of the present invention may be implemented as a program and stored in a recording medium (CD-ROM, RAM, ROM, floppy disk, hard disk, magneto-optical disk, etc.) in a computer-readable form.

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 apparent to those of ordinary knowledge.

The present invention as described above, by using the existing geographic information system as it is possible to build an integrated management system can shorten the system development time and cost, each of which is implemented as a component to provide a standardized common interface to the outside This improves programming language independence and interoperability, allowing other new systems to be easily reused for system purposes.

In addition, the present invention obtains data by accessing different types of geographic data stored in different systems through a standard interface, so that the data can be easily and effectively utilized in a large amount of geographic data that has been separately produced according to an application field in the past. There is an effect to reduce the financial and time wasted on the.

Claims (6)

In the geographic information processing component system for providing a geographic information service, Application programming means for integrated management of heterogeneous geographic information systems or for obtaining geographic data held by other geographic information systems; Data provider component means for connecting to a data source and converting data in a unique format stored in each data source into a standard format for providing to a client; MapBase component means for extracting geographic information from the data provider component means and exposing it to the outside through a standard interface; First interfacing means for exposing a function possessed by said MapBase component means to the outside; And Second interfacing means for interfacing the data provider component means and the MapBase component means Geographic information processing component system comprising a. The method of claim 1, The data provider component means, A GIS system, comprising: accessing a data source, converting data in a unique format stored in each data source into a standard format in a well-known binary (WKB) format, and providing the same to a client. The method of claim 1, The second interfacing means, A geographic information processing component system comprising an interface for a geographic information system to an OLE / DB (Object Linking and Embedding / DataBase) interface. A data processing method applied to a geographic information processing component system, Acquiring information about the data source and accessing the data source; A second step of determining whether a connection to the data source was successful; A third step of outputting an error message and acquiring information on the data source of the first step if the connection is not successful as a result of the determination of the second step; A fourth step of acquiring spatial data and attribute data and converting the data into geometry if the connection is successful as a result of the determination of the second step; And A fifth step of storing the geometry in an internal memory and outputting the image to a screen; Data processing method comprising a. The method of claim 4, wherein The data source, A data processing method comprising a database containing data, a spreadsheet, an e-mail, and an indexed sequential access method (ISAM). In a geographic information processing component system having a large processor, A first function of obtaining information about the data source and accessing the data source; A second function of determining whether a connection to the data source was successful; A third function of outputting an error message and obtaining information on a data source of the first function if the connection is not successful as a result of the determination of the second function; A fourth function of acquiring spatial data and attribute data and converting the data into geometry if the connection is successful as a result of the determination of the second function; And A fifth function of storing the geometry in an internal memory and outputting the image to a screen; A computer-readable recording medium having recorded thereon a program for realizing this.