| Summary: | 碩士 === 國防大學中正理工學院 === 軍事工程研究所 === 92 === Because of database inconsistency, it is difficult to integrate different information systems, especially for spatial information system, the key impediment arising from semantic heterogeneity and incompatible spatial data formats. Although there is a lot of solution solving semantic heterogeneity of the schema or incompatible graphic data format independently, but few of them concerned these two problems at the same time. In practical spatial information system’s architechture, spatial data always comes with database. This paper proposes a Mediation of Unified Schema for integrating both attribute database and spatial data schema, and transfer different spatial data into the same Geography Markup Language (GML) document format for data exchanging. The technique of Mediation of Unified Schema is based on Extension Markup Language (XML), including three modules: (1) Unified Schema: using mapping Unified Schema to integrate attribute database schema by mapping into XML Schema, as for spatial data, concerning the need of different area, GML Application Schema is created to describe domain area spatial feature structure and content. (2) The exchange and integration of spatial data: Spatial data transfered to GML document as a canonical data model, and using designed GML Application Schema to verify the exchanged GML data, to ensure the data format is correct. (3) Data access design: after finishing the design of Unified Schema environment, to access dispersed data, this paper proposed a method using Java tools to parse the Unified Schema, and get the element objects. Through the connection interface, one can get integrated data of dispersed system, and translate and integrate the representation of attribute XML document into table format, and spatial GML document into SVG format. Finally, the research presents verifications of the integration of both systems of the proposed method on installation OO camp and TT camp.
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