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Spatial Data Infrastructure (SDI) is currently being set up with regions, countries, and across national borders to facilitate management and access to geospatial information. GIS services include GIS data services and geoprocessing services which are the main components of SDI to provide remote, standard, and reusable geospatial data and function services. The information, metadata or input/output data description, would all be recorded in catalogue services for users to discover suitable GIS services. This paper introduces the current effort in Taiwan government to develop an ontology-based service oriented architecture framework for National Geographic Information System (NGIS).
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