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The Development of TGOS

      In 1990, Ministry of the Interior established the "National Geographic Information System Steering Committee (NGISSC)". The Committee is composed of nine working groups from different agencies which have subsequently developed geospatial data and databases. Because the organizations where data produced are located at different places, end-users find it very difficult to get complete, real time spatial data from various agencies through one platform. This has resulted in redundant data construction, insufficient information gathering, and other issues. Furthermore, it has also downgraded the strength of comprehensive and diversified geospatial data. Consequently, the NGIS Data Warehouse and Web Service Platform (simply referred to as Taiwan Geospatial One-Stop Portal, or TGOS Portal) developed by the Information Center, Ministry of The Interior, in 2003 is to provide the e-commerce services of processing geospatial data supply; therefore, TGOS portal not only offers metadata query, geospatial data overlay, and free geospatial data download; but also online purchase, payment, and online geospatial data download to users. In addition, in order to provide more solutions for authorization requirements, TGOS portal combines the PKI (Public Key Infrastructure) feature and respective authentication function into the information security system to validate user identity. Furthermore, since 2007, with the apprehension of the needs for value-added applications among various organizations, the Information Center, Ministry of The Interior, has been advocating the web service concept and integrated process technology to expedite the application and development of national geographic information system, with the introducing of SOA (Service-Oriented Architecture) for TGOS portal function enhancement; as well as the utilizing of enterprise Web 2.0 structure and standardized service interface for various sources of integrated service elements to build up the distribution of geospatial data and the application of added values.
     In response to the recent expansion of system user interface, information standards and physical operation models as results of information science and GIS technology advancement, the Information Center, Ministry of the Interior, revised and integrated TGOS portal in 2008, it also drafted TWSMP 1.0 metadata standard and developed web version as well as standard-alone version of metadata editing system in June 2007 so as to incorporate ISO 19139 encoding standards. This system is to be used by NGIS geospatial data suppliers for the purpose of efficient metadata editing and importing to set up complete NGIS metadata database and to establish sharing environment for NGIS geospatial data distribution.