Based On Xml-geographic Information Web Services Research

21st century is the era of Information Technology and the Internet. With the rapid development of the internet. GIS applications extend its area from desktop to the Internet. Although there are huge geospatial information exists in the Internet, we have to face the facts that Thousands of Web sites provide images and maps of the earth, but they don't work together, it's hard to using our web browser to seamlessly access, view and exploit the vast, diverse and widely distributed geospatial data holdings on the Web. For business policy and data security, most of these data resources consist in legacy systems and isolated in desktop applications and back-office servers, it's hard to provide enough supports for spatial decision-making. Geospatial technologies are now undergoing a transformation to become better suited for the Web.This dissertation focuses on the introduction of new coming Internet technology and its application in GI domain. In chapter one, it introduces the history of Web Mapping technology and the development of WebGIS and then introduces the OpenGIS platform that is implementing by OpenGIS consortium. In chapter two. it introduces the architecture of the popular Web Mapping technologies and compares the characteristic and limitation of them.Traditional Web Markup Language that has been used is incapable of describing complex geospatial data on Web. For this reason, we need a new technique to solve the problem. XML (extensible Markup Language) is the answer. XML began as a project to address HTML's limitations on structured documents, by selecting a simple to implement yet extensible subset of SGML for use on the Web. It has emerged as the infrastructure for structured data interchange as well. XML is an ideal media for share of semantic information on the Web and information interoperability. At the same time, it also provides a good solution for geospatial data interoperability.Microsoft .NET is a set of Microsoft software technologies for building next generation information, people, systems, and devices. It enables an unprecedented level of software integration through the use of XML Web sen. ices. The benefit to individuals is seamless, compelling experiences with information sharing. Microsoft .NET expands opportunities to act on data and communicate anywhere, anytime, on any device. .NET connected software uses a distributed computing model and builds on open standards like XML to connect PCs and other smart devices. Web Services are core of .Net. Web Services represent an evolutionary, standards-based framework that enables seamless integration of a variety of online geoprocessing and location services. It allows distributed geoprocessing systems to communicate with each other across the Web using familiar technologies such as XML and HTTP. Web Services provide a vendor-neutral, interoperable framework for web-based discovery, access, integration, analysis, exploitation and visualization of multiple online geodata sources.The main content of the study is to use XML and Web Sen ices to build a Web-Based Geospatial Service Platform, and implement an application system based on the platform. The study builds the Geospatial Service Platform through three aspects. Firstly, in the dissertation, we use GML as geospalial data model and data source, then implement the GML data store in XML-enabled Database. Secondly, we build a simpleand runable Web Service based on .Net to provide geospatial service. Thirdly, we use SVG as a visualized tool for Web Mapping on client.XML-based Geospatial Web Service is a new field in GI community, the research and its development on it will not only bring forth great impact on traditional conception and traditional technology, but also greatly affect development of GIS methodology, geographical information industry and Digital Earth. Because research on this domain is immature, this dissertation only covers initiatory discussion and research on Geospatial Web Service model and related problems. If there are deficiencies in this dissertation, pleas...