The Design And Development Of Digital Map Based On WebGIS

Geographical Information System combines spatial data and attribute data efficiently, and provides a kind of visible query method. ComGIS and WebGIS are new ever-developing technology in these years. Campus-Wide Geographical Information Systems digitalizes all the geographical information about teaching, research, administration and service in campus by using GIS. The system is established on WebGIS(an integration of Web technology and GIS), because the Campus-Wide Geographical Information System is based on Campus Web —which is a kind of LAN and is fast in the campus. Following B/S mode it can be visited conveniently only through Browser. In addition, the client does not have to setup any other application software, and any change and update of the system is visible to the users, so it is easy to be managed. The campus-Wide Geographical Information System uses the platform of .NET, and embeds MapX and MapXtreme (two widgets based on COM technology) into .NET by using committal technology. An object of MapXCourier, generated from MapXtreme server, makes application program visit the inner MapX object through the instance of MapXserver, and loads the geosets included in the MapX object. At the same time, it transfers GIF or BMP files to Browser. So it is static picture but not MapX object to be transferred between Client and Server. The whole syetem adopts some pivotal technologies, such as vectoring grid map, binding data, detailing map layer, hawk-eye technology, and creating map files automatically. The system is being used, and has a good performance. It has the functions to zoom in, zoom out, add and delete features, show the information about features through visiting Database, create map files automatically, and so on.