• Proceedings of the KSRS Conference
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• 1999.11a
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• pp.84-88
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• 1999

Recently, the necessity of accessing spatial data from remote computer via network has been increased as distributed spatial data have been increased due to their size and cost. Many methods have been used in recent years for transferring spatial data, such as socket, CORBA, HTTP, RPC, FTP, etc. In this paper, we propose spatial clearinghouse components to access distributed spatial data sources via CORBA and Internet. The spatial clearinghouse components are defined as OLE/COM components that enable users to access spatial data that meet their requests from remote computer. For reusability, we design the spatial clearinghouse with UML and implement it as a set of components. In order to enhance interoperability among different platforms in distributed computing environment, we adopt international standards and open architecture such as CORBA, HTTB, and OpenGIS Simple Features Specifications. There are two kinds of spatial clearinghouse: CORBA-based spatial clearinghouse and Internet-based spatial clearinghouse. The CORBA-based spatial clearinghouse supports COM-CORBA bridge to access spatial data from remote data providers that satisfy the OpenGIS Simple Features Specification for OLE/COM using COM and CORBA interfaces. The Internet-based spatial clearinghouse provides Web-service components to access spatial data from remote data providers using Web-browser.

• Proceedings of the KSRS Conference
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• 2003.11a
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• pp.834-836
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• 2003

Recently, web services concept is rapidly rising as new solution to solve the integration problem among heterogeneous application systems . This web servic es concept is adaptable in the field of 4S application systems integration that handles the spatial information of GIS, SIIS, GNSS and ITS. So, this paper suggests a new 4S web services model for the infrastructures of nationwide spatial clearinghouse, which is mainly based on the OGC and W3C web services specifications. Conclusively, this proposed model that could serve various spatial data and services has some advantages of being flexibly and powerfully capable of integrating the 4S application systems owing to adapting the international standard specifications of OGC and W3C.

• Journal of Korea Spatial Information System Society
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• v.2 no.1 s.3
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• pp.63-72
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• 2000

The architecture of the National Geo-spatial Information Clearinghouse Network (NGICN) is suggested in this paper. We described the function and relationship of six elements of the NGICN. The elements are clearinghouse network gateway, clearinghouse node, geo-spatial data server, communication network, protocols and standards, and clients. The NGICN suggested in this research will prevent the duplication and improve the value of the database, and persuade the institutes or enterprises in the private sector to participate in producing the geo-spatial database. Finally it will setup the business of producing, circulating and utilizing the geo-spatial information as a new bases of Info-Communication Industry.

• Journal of Korea Spatial Information System Society
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• v.2 no.2 s.4
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• pp.89-97
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• 2000

This paper deals with the method which can apply spatial-data warehouses into the spatial data infrastructure in the view of clearinghouse. First, we classify the type of available data warehouses in the consider with patterns and properties of spatial data infrastructure. Then we suggest strategies for building and expanding data warehouses into various organizations. After considering all the factors, we suppose how the national spatial data warehouse come into being.

• 한국공간정보시스템학회:학술대회논문집
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• 2001.11a
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• pp.237-250
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• 2001

본 연구에서는 Clearinghouse 중심의 공간 유통정보체계에 대하여 공간 데이터웨어하우스를 적용시키는 방안에 대하여 살펴본다. 이를 위해 먼저 유통체계에 따라서 설치 가능한 데이터웨어하우스의 유형 및 특성을 검토하여 3가지 형태로 분류하였다. 또한 조직의 특성 등에 따라 수평적 체계 및 수직적 체계에서의 데이터웨어하우스 구축 및 확산전략을 제시하고, 이런 요소들이 전체적인 구성을 이룰 경우 총괄적인 모습으로 나타나는 국가 공간데이터 웨어하우스에 대하여 살펴보았다.

• Spatial Information Research
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• v.11 no.4
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• pp.453-464
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• 2003

The Competitive power of the country in knowledge information can be determined that how efficiently useful knowledge and information can be circulated. Korean government established the second National GIS Master Plan, and constructed National Geographic Information Clearinghouse to the goal 'whole nation's internet circulation of the geographic information and practical use'. But every departments of government are trying to circulate their geographic information individually, And this case, consumer group should approach to several dissemination network in various routing line to get the geographic information. In fact, it is difficult to present the solution for uilified single dissemination network. It is difficult to present suitable linkage plan coinciding in special environment and characteristics of all systems. Consequently, in this study, we suggested linkage element that should consider far link with National Geographic Information Clearinghouse, and presented linkage plan by linkage target type.

• 한국공간정보시스템학회:학술대회논문집
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• 1999.06a
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• pp.131-145
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• 1999

최근 정보화 사회에서 정보의 처리와 공유에 대한 관심이 크게 증가하지만 기존 지리정보시스템(GIS)이 갖고 있던 상호 이질적인 지형공간데이타 포맷을 가지고는 효율적인 정보의 처리와 공유가 어려운 형편이다. 이러한 지형공간데이타 포맷의 문제로 인해 지형공간 데이터의 중복수집의 문제가 발생하였으며, 또한 많은 시간과 경비가 중복 투자퇴고 있다. 본 논문에서는 지형공간 데이타 중복수집의 문제점을 효과적으로 해결하고, 이미 구축되어 있는 지형공간 데이타를 필요로 하는 사람들과 공유하고 유통하기 위하여 KGDC(Korean Geospatial Data Clearinghouse)를 설계 및 구현하였다. KGDC를 통하여 ESRI와 Intergraph사의 상용 지리정보시스템들의 데이타를 별도의 처리과정 없이 공유할 수 있으며, 또한 OGC(OpenGIS Consortium)의 OpenGIS 구현명세에 기술되어 있는 표준 OpenGIS 인터페이스를 지원하는 지형공간 데이타 서버의 데이타도 효과적으로 공유할 수 있다. 특히, KGDC는 다양한 검색 기능과 다양한 정보를 제공하여 손쉬운 지형공간 데이타의 공유 및 유통을 가능하게 하며, 검색을 위한 정보와 검색의 결과로 이용하기 위해 ISO/TC211 표준 메타데이타를 부분적으로 지원하고 있다.

• Journal of Korea Spatial Information System Society
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• v.3 no.2 s.6
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• pp.53-61
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• 2001

The GIS Network consists of the Clearinghouse Network Gateway and Clearinghouse Node and Geo-spatial Data Server. Recently with the development of Information and Network technologies, GIS Network should be needed to be more secure than ever. In this paper, we proposed the effective access control method for the distributed GIS network. PKI (Public Key Infrastructure) Technologies are used for access control and security for transmission on Geo-spatial data

• Korean Journal of Geomatics
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• v.2 no.1
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• pp.75-82
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• 2002

The information system fields of spatial applications have rapidly grown during the last decade in Korea. Spatial data has been produced for a variety of systems without common standards until national GIS Committee defined the data exchange formats among spatial databases in the middle of 1990's. It aimed at promoting data sharing between the different systems in similar application fields. However, a considerable number of databases built prior to the introduction of the standards are not yet standard compliant but still play the roles of the main producers/consumers in the data collection field such as early developed huge AM/FM systems maintained by governmental organizations. The strong autonomy of these databases keeps their own data models, formats and descriptions from being standardized, which leads the sharing to a more difficult stage. Sharing is another way of data acquisition with least efforts and time away from direct collection. A data clearinghouse is the core module which directs users to the relevant data resources. The contents of datasets should be described with predefined metadata standards for precise indexing. Moreover, a number of technical problems have to be resolved for the common use of data between heterogeneous spatial database systems. However, the technical issues can be covered by the present information technologies. The difficulties persist in the political/institutional issues. Institutional issues are derived from the diverse sources such as political background, governmental policies, related laws and/or regulations. The paper will firstly make an analysis of current situation in terms of Korean policies, laws and regulations, secondly abstract the institutional issues from the situation analysis, lastly present guidelines for promoting spatial data sharing in Korea.

• Journal of Korean Society for Geospatial Information Science
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• v.15 no.4
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• pp.21-29
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• 2007

The National Geographic Information Clearinghouse (NGIC) in Korea has been established to share dispersed geographic information in many government organizations. The NGIC has become a main hub for sharing and exchanging geographic information in Korea. However, due to rapid technological advancement, citizens not only require more information but also demand more functions for NGIC. In this regards, this research tries to find the way of developing NGIC from a means of 'information sharing' to an arena of 'information use'. To do so, it suggests new technical frameworks and functionalities for NGIC. Then it recommend policy measures to improve current NGIC.