Research and application on spatial data Web service based on .Net platform

With the rapid development of Internet, GIS (Geographic Information System) application extends its area from desktop to the Internet, which provides various GIS services of analyzing and displaying the spatial data. Although there is huge geo-spatial information existing in the Internet, it is difficult to use Web browser to seamlessly access, view and exploit the vast, diverse and widely distributed geo-spatial data, which makes it hard to develop GIS application and to provide enough support for spatial decision-making. In this paper, we analyze the geo-spatial information Web Service architecture of OGC (OpenGIS Consortium), and then we design and implement a Web-based Geo-spatial Service Platform using GML (Geography Markup Language) and Microsoft .NET. This Geo-spatial Service Platform is built through three aspects. Firstly, we use GML as geo-spatial data model and data source, and then implement the GML data stored in SQL-Server. Secondly, we build a prototype Web service system based on Microsoft .NET to provide geo-spatial service. Thirdly, we use SVG (Scalable Vector Graphics) as a visualization tool for Web mapping on client. This Web service platform provides a vendor-neutral, interoperable framework for Web-based access, integration, analysis and visualization of multiple online geo-spatial data sources. Finally, using spatial data Web service interfaces, which are provided by this platform, we implement a simple GIS application system, which implements the spatial information query and map projective transform on the Internet.