WebGIS Research And Application Based On .Net

As a conjunction of Internet technology and GIS technology, the development of WebGIS has closely related with the development of Computer technology. From 90s, as the network technology developed quickly, which presented by Internet, WebGIS applications have developed rapidly. Meanwhile, there also appeared many questions in WebGIS systems. Some of these questions are brought by Web software, such as the cross-platform and cross-language problems. Others are brought by GIS software, such as the data interoperative. So, we must do research in both GIS and Web areas to efficiently solve these problems..NET is a set of software technologies for building next generation information, people, systems, and devices. Web Services are core of .Net. 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..NET expands opportunities to act on data and communicate anywhere, anytime, on any device.This dissertation focuses on the introduction of new coming Internet technology and its application in GI domain. First. It introduces the development of WebGIS and the architecture of the popular Web Mapping technologies and compares the characteristic and limitation of them. Second, It introduces the .NET and its core-Web Service, with Service frame, protocols, criterion.Then Based on the research about OGC standards, I present the detail design and implementation procedure of this WebGIS electric power net displaying information of electric line and equipment, which include the design and implementation of Application Server and Client. Because I use thin client application mode, so the implementation of the client just includes two aspects: the interface design and the interaction with Application Server. In the implementation of the Application Server, I mainly use the Web Service to provide the various functions to client. By these steps, I implement a 3 tier scalable WebGIS system by Web Service.Finally, I conclude the research and implementation of WebGIS system and then present the problems that need to be solved further and the vista of Web Service.