GIS Park

The real estate is a property that to be closely linked with every person, how to take a estimate report quickly is a difficult problem that every buyer would pay close attention to. As a result of the most important key of the value of the house property is the site of the house, a idea was thought out that combining the WebGIS and the house estimate together to develop the House Estimate System that based on WebGIS,and then the aim of estimate house quickly will be accomplished.The paper has introduced traditional WebGIS technology and realization method. Such as CGI、SevrerAPI、Plug In、ActiveX、Java Applet, and so on. Then a comparison has been made between WebGIS based on technologies. On the basis of comparison, it pointed out disadvantages of the tradition WebGIS technology, which including poor possibility of re-usage, poor common usage of client and low requesting speed. A matter what WebGIS design method based on fat Client and thin Server or fat Server and thin Client, while it that Google maps and Google Suggest and baidu map and 51ditu based on Ajax technology ,success provides a new designs solution and schema.In The aspect of Technique, the article has stressed Ajax technology and detailed the working method of asynchronism communication layer. It also has compared the working methods of Ajax asynchronism communication mode and traditional network mode and pointed out advantages of asynchronism communication mode. On the basis of above, Ajax technology based on JSON has been used for mode establishment and analysis. With the usage of middle layer which developed by client himself from .NET bottom platform and with complete of Ajax technology, the Client of Web GIS has been established.ASP.NET has been used to realize communication between response of data asynchronism and server. At the same time, a simple WebGIS system has been established and anticipative effect has been realized through test.