KR100353288B1 - Spatial data clearing system based on OpenGIS - Google Patents

Abstract

The present invention provides a CORBA implementation specification of an open GIS suitable for supporting interoperability and interoperability between heterogeneous platforms in a distributed environment in order to solve the problem of integration and improve the reusability of development application systems with sharing spatial information in a distributed environment. It is an open GIS-based spatial information distribution system that can share and distribute spatial information and services, which are componentized based on it, and provide information on who and where the spatial information and services that clients want to use are provided. Having a spatial information distribution server; And CORBA-based interfaces and mappings installed in each of the COM-based data provider components, application components, and core common components to enable platform-independent use of spatial information and services provided by each component in a distributed environment. Spatial information distribution basic components that provide data and services through the spatial information distribution server, the COM-based data provider components, application components, core common components are interlocked by a distributed environment, the client is the spatial information It is characterized by receiving spatial information and services from the COM-based data provider component, application component, and core common component using the information provided through the distribution server.

Description

Spatial data clearing system based on OpenGIS}

The present invention relates to a geographic information system, and more particularly, to a spatial information distribution system based on an open geographic information system.

As information technology advances, the life cycle of software such as hardware, DBMS, and GIS is shortening. Therefore, spatial information should be constructed so that it can be used regardless of the type of GIS engine or spatial DBMS. However, in most cases, the overlapping investment is generated for collecting spatial information. Accordingly, in accordance with the recent changes in the software paradigm, we are developing components in a way that is independent of the operating environment and can be operated individually beyond the limits of the existing software, thereby pursuing reusability and efficiency in application software development time and cost.

The National Spatial Data Infrastructure (NSDI) project is creating a new added value as the amount of spatial information in Korea continues to increase, and the viewer market wants easy spatial information services rather than software that requires complex functions. The potential is increasing. In addition, it requires the provision of remote civil services and administrative services using spatial information such as topographical maps, thematic maps, and cadastral maps. In addition, digital map producers require services of verified and refined spatial information through a clearinghouse. However, spatial information based on distributed environment is not only huge but also very complicated and used in different S / W or H / W environments.

Research on interoperability of spatial information is centered on technical committee members of the International Organization for Standardization (ISO / TC 211), the OpenGIS Consortium (OGC), the Federal Geographic Information Standardization Committee (FGDC) in the United States, and the European Commission for Standardization (CEN). In addition to metadata, technical standardization of model proposals and data formats is underway. In particular, OGC's open GIS proposes an abstract specification based on object technology and an implementation specification in distributed environments such as CORBA and OLE / COM for interoperating spatial information in heterogeneous distributed computing environment. It can be provided to software developers in the form of a common standard interface. As such, advanced countries have already put a lot of budget for efficient distribution and utilization of spatial information produced and managed by individual institutions, and are promoting the establishment and utilization of spatial information distribution mechanisms.

Currently, the specification of the spatial information distribution component that follows the open GIS standard is not clearly presented, and it is not well recognized the necessity of research and various technologies.

Most GIS related data and system developments developed so far only operate on GIS engines of specific suppliers, so it is very expensive to change selected geographic information system. Therefore, it is necessary to introduce a technology that can build spatial information to be used regardless of the type of GIS engine or spatial DBMS. Accordingly, according to the recent software paradigm change, the development of components that are independent of the operating environment and can operate independently beyond the limits of the existing software, improves the reusability of application software, shortening development time, and efficiency in terms of cost. have.

Existing spatial information is constructed in various formats, and spatial information processing service is implemented with system-dependent data types and interfaces. Moreover, if you want to use spatial information elsewhere in a distributed environment, you need a technology that supports platform-independent use. In particular, in order to use COM-based spatial information and services in the information distribution system that operates CORBA as a standard distributed environment standard, each information provider needs additional work for interworking between CORBA and COM.

The technical problem to be solved by the present invention is an open GIS suitable for supporting interoperability and interoperability between heterogeneous platforms in a distributed environment in order to solve the problem of integration and share the spatial information in a distributed environment and to increase the reusability of development application systems. It is to provide an open GIS-based spatial information distribution system that can share and distribute spatial information and services that are componentized based on CORBA implementation specification.

1 is a block diagram showing an open GIS-based spatial information distribution system according to the present invention.

2 illustrates a structure of a spatial information distribution server.

3 illustrates a structure and an operation process of a spatial information distribution basic component for a data provider.

4 illustrates a spatial information distribution basic component for a data user.

The open GIS-based spatial information distribution system according to the present invention for solving the above technical problem is a spatial information distribution system for using COM-based spatial information and services in an information distribution system that operates CORBA as a standard for a basic distributed environment. A spatial information distribution server having spatial information that a client intends to use and information on who provides a service; And CORBA-based interfaces and mappings installed in each of the COM-based data provider components, application components, and core common components to enable platform-independent use of spatial information and services provided by each component in a distributed environment. Spatial information distribution basic components that provide data and services through the spatial information distribution server, the COM-based data provider components, application components, core common components are interlocked by a distributed environment, the client is the spatial information It is characterized by receiving spatial information and services from the COM-based data provider component, application component, and core common component using the information provided through the distribution server.

The spatial information distribution server may further include: a metadata database that stores spatial information and information on who is present in which service; A search component for searching for information desired by a client in the metadata database; A transmission component for transmitting information desired by the client; And a metadata management component for registering, modifying, and deleting the metadata.

In addition, the spatial information distribution basic component is characterized in that connected by the COM-based data provider component, application component, core common component and OLE / COM interface.

In addition, the spatial information distribution basic component for the data provider component accesses the data source after the authentication process for the user's identification code (ID) and password to generate a result rowset, and the resulting result set is an open geography It is converted to Simple Feature of CORBA of information system and transmitted to client by using transport component.

In addition, the spatial information distribution basic component is characterized in that it is also provided to users of spatial information to use the spatial information and services provided by the COM-based data provider component, application components, core common components.

In addition, the spatial information distribution basic component for users of the spatial information is characterized in that it is classified into information distribution basic components for users of the environment other than OLE / COM and information distribution basic components for users of the OLE / COM environment.

In addition, the information distribution basic components for users of the non-OLE / COM environment operate on a platform other than the OLE / COM environment, and those who want to develop a system according to the CORBA implementation specification of the open GIS or OLE / COM-based data It is a component for clients who want to use the services provided by the spatial information or other components provided by the provider.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The present invention proposes a model for enabling platform-independent use of data and services provided by each component in a distributed environment.

1 is a block diagram illustrating an open GIS-based spatial information distribution system according to the present invention, which includes a spatial information distribution server 100, a core common component 110, a data provider component 120, an application component 130 and Information flow basic component 140.

The spatial information distribution server 100 may include a metadata database 101 for storing spatial information and information about who is present at which location, and a search component for retrieving information desired by a client from the metadata database 101 ( 104, a transport component 103 for transmitting the information desired by the client, and a metadata management component 102 that functions to register, modify, and delete the metadata.

The data provider component 120, the application component 130, and the core common component 110 are all components that are developed based on OLE / COM and operate monolithically.

The information distribution basic component 140 is installed in each of the COM-based data provider component 120, the application component 130, and the core common component 110, and distributes spatial information and services provided by the respective components in a distributed environment. Provides data and services through CORBA-based interfaces and mappings for platform-independent use.

In addition, each component may be used as a stand alone system, and by installing the spatial information distribution basic component 140, it may be extended to be used by anyone in a distributed environment.

2 illustrates a structure of a spatial information distribution server.

The server for the distribution of spatial information has information about who is present and where the data and services that the end client intends to use are provided. Spatial information distribution server is largely composed of metadata database, search component, transmission component, and metadata management component.

As research on interoperability of information in heterogeneous distributed environment began, metadata included extended information such as location information. In addition, research on the standardization and exchange protocol of metadata has been conducted mainly on information retrieval systems that need to share information between different systems, and it is also applied to GIS related systems. Metadata in the information distribution basic model proposed by the present invention is registered in the metadata database of the spatial information distribution server by the information provider and needs the spatial information and spatial information processing services separately constructed in the heterogeneous distributed environment. The location information is managed by the information distribution server together with the information necessary for the search to be provided to the user.

Spatial information distribution basic components are essential components for information distribution. The core function is to use platform-independent use of data and services provided by Microsoft's COM-based data provider components, core common components, and application components in a distributed environment. To enable this, data and services are provided through CORBA-based interfaces and mappings.

Based on what we've said so far, we've defined information distribution components as information distribution base components for data provider components, information distribution base components for core common components, information distribution base components for application components, and users in environments other than OLE / COM. It can be categorized as information distribution basic component and information distribution basic component for users of OLE / COM environment.

Spatial information distribution basic components for data and service providers in OLE / COM environment are classified as follows.

● Spatial information distribution basic component for data provider component

-Spatial information distribution basic component for Shape data provider component

-Spatial information distribution basic component for SDE data provider component

-Spatial information distribution basic component for Geus data provider component

-Spatial information distribution basic component for MGE data provider component

-Spatial information distribution basic component for GeoMania data provider component

● Information distribution basic components for core common components

● Information distribution basic components for application components

In the present invention, the spatial information distribution basic component for the data provider component is used by a data provider using the data provider component to provide spatial data. Spatial information distribution basic components for data provider components are as follows.

1. The user's identification code (ID) and password (password) are authenticated.

2. Access the data source (data source) to create the resulting rowset.

3. Convert the resulting result set to a CORBA simple feature in OpenGIS. (COM-CORBA connection)

4. Send the converted simple feature using the send component.

3 illustrates the structure and operation of the information distribution basic component for the data provider component.

The information distribution basic component for the data provider component first goes through the authentication process for the identification code and password passed as parameters to access the data source requested by the client.

One information flow base component for the data provider component exists, one for each data provider that provides an OLE / DB interface using the OGISDataProvider component implemented according to the OLE / COM specification of the open GIS. The information flow base component for each data provider component uses the OLE / DB interface provided by each data provider to access each data source. To create a result set by accessing a data source, the standard interfaces provided by Microsoft's OLE / DB are data source interface, session interface, command interface, Use the Rowset Interface. This results in a lowset object. This part embraces and implements OpenGIS's OLE / COM specification.

In order to make COM-based low-set objects available to anyone, platform-independent in a distributed environment, convert them to simple features provided by the CORBA specification of open GIS and provide them to clients. In order to convert the generated result set into a CORBA simple feature, a COM-CORBA linkage method is required. The entity to be sent to the client implements the OpenGIS CORBA specification.

The converted simple features are sent to the client using the transport component. Clients can use the transmitted simple features on any platform if they conform to the standard features of the simple features in the CORBA specification of the open GIS.

Each Spatial Information Distribution basic component for a data provider differs in access rights and methods of accessing a data source, but everything else does the same.

Information flow basic components are also required for users of spatial information who want to use data and services provided by data provider components, application components, and core common components.

The basic components of spatial information distribution for data and service users are classified as follows.

● Information distribution basic component for users of other environment than OLE / COM

● Information distribution basic component for users of OLE / COM environment

Among them, the Spatial Information Distribution basic component for users of other than OLE / COM environment is not OLE / COM environment, that is, people who want to develop the system according to CORBA implementation specification of Open GIS and operate on other platforms such as Unix. Spatial information distribution basic component for clients who want to use spatial information provided by / COM based data provider or service provided by other components. This Spatial Information Distribution base component is implemented according to the open GIS CORBA implementation specification and can be used by anyone who follows the OGC standard CORBA implementation specification.

4 illustrates a spatial information distribution basic component for a data user.

The client first retrieves information about who provides the spatial data and the service that the client wants to use through metadata search. Upon request from the client, the metadata retrieval component of the information distribution server searches the metadata database and informs the client of location information about the requested data and information about the content of the data. The client identifies the location of the data for use in the application and stores that location information for use in its application. The client uses the stored location information to operate on the spatial data by calling the standard interface provided by the open GIS CORBA specification, that is, the interface to the simple feature of the Open GIS CORBA specification. For the requested simple feature, data processing provided by the data provider through the spatial information distribution basic component is performed through the transmission component of the spatial information distribution server.

Applications can display, zoom in, and zoom out data distributed through information distribution components implemented in accordance with the open GIS standard specification, as well as equal, touches, contains, within, disjoint, crosses, overlaps, and intersects provided by the open GIS standard specification. Spatial operations such as That is, the client can perform operations on the data as if it were in its own local to the spatial data existing in the remote.

The drawings and specification are merely exemplary of the invention, which are used for the purpose of illustrating the invention only and are not intended to limit the scope of the invention as defined in the appended claims or claims. Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible from this. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

According to the present invention, spatial information and services are componentized based on the CORBA implementation specification of an open GIS suitable for supporting interoperability and interoperability between heterogeneous platforms in a distributed environment, provided that different GIS engines are used. By establishing a spatial information distribution system that can be distributed and distributed, it can be used by all institutions that need spatial information such as government, public institutions, local governments, and private companies that create, manage, distribute, and utilize spatial information. Will be used.

In addition, the user who needs the spatial information wants to receive the spatial information verified and refined through the clearing house by the spatial information producer, and it is determined whether the spatial information provided is suitable for the user's needs. You need information that you can. In addition, producers also need data on spatial information to pursue the ease of access and retrieval of information held by institutions. As such, the necessity of metadata and the demand for efficient data construction are emerging. By accommodating them, producers of spatial information can accept standards on the format and components of metadata about the information they provide so that users can easily obtain information about the spatial information and access information that meets their needs. do.

Claims (7)

In the spatial information distribution system for using COM-based spatial information and services in the information distribution system that operates CORBA as a standard of basic distributed environment, A spatial information distribution server having spatial information that a client intends to use and information on who provides a service where; And Installed in each of the COM-based data provider component, application component, and core common component, and through the COB-based interface and mapping to enable the spatial information and services provided by each component to be used independently of the platform in a distributed environment. Spatial information distribution basic components that provide data and services, The spatial information distribution server and the COM-based data provider component, application component, and core common component are interworked by a distributed environment. The GIS-based spatial information distribution system is characterized in that the client receives spatial information and services from the COM-based data provider component, application component, and core common component using the information provided through the spatial information distribution server. . According to claim 1, wherein the spatial information distribution server A metadata database for storing spatial information and information on who provides a service anywhere; A search component for searching for information desired by a client in the metadata database; A transmission component for transmitting information desired by the client; And An open GIS-based spatial information distribution system comprising a metadata management component that functions to register, modify, and delete the metadata. According to claim 1, wherein the spatial information distribution basic component An open GIS-based spatial information distribution system characterized by being connected by the COM-based data provider component, an application component, a core common component, and an OLE / COM interface. The spatial information distribution basic component for the data provider component according to claim 1, After authentication of the user's identification code and password, the data source is accessed to generate a result rowset, and the resultant rowset is converted into COVA's Simple Feature of open GIS. An open GIS-based spatial information distribution system characterized by transmitting to a client using a transmission component. According to claim 1, wherein the spatial information distribution basic component An open GIS-based spatial information distribution system, characterized in that it is also provided to users of spatial information provided by the COM-based data provider component, application component, and core common component. According to claim 5, The spatial information distribution basic component for the spatial information user An open GIS-based spatial information distribution system characterized by being classified into a basic information distribution component for users in an environment other than OLE / COM and a basic information distribution component for users in an OLE / COM environment. The information distribution basic component for a user of an environment other than the OLE / COM. A client operating on a platform other than an OLE / COM environment and wishing to develop a system in accordance with the open GIS COVA implementation specification, or to use spatial information provided by an OLE / COM-based data provider or services provided by other components. Open GIS-based spatial information distribution system, characterized in that the component for.