网络地理信息系统的关键技术及开发应用

网络地理信息系统（WebGIS)是GIS技术和互联网（Interner/Intraner)技术相结合的产物。本文论述了实现网络地理信息系统的关键技术，分析了CGI技术、Plug-in技术及ObjectWeb技术的发展，并给出了一个长江口历年海图查询的具体实例。可以按照年份、地域查询海图，并可以在客户机上实现一般的GIS所需的人机交互功能，如放大缩小移动剖面等。对本实例稍加扩充，可以实现发布任一点的水位变化、与陆图的无缝合成查询以及海域导航等多种实用功能，可以在各种开发项目中得到应用。

THE KEY TECHNOLOGY OF THE WebGIS AND ITS DEVELOPMENT AND APPLICATION

Web Geography Information System is a production by combining GIS and Internet/Intranet technology. This paper describes the key technology of how to implement the WebGIS and analyses the development of the technigues. such as the CGI,Plug-in and Object Web. Also,this paper gives an example which can search the chart of the Yangtse river mouth by year or area and accept interactions such as zoom out,zoom in,move,section etc. on client computer. With slight expansion, this example can also implement water level broadcasting at any location, searching of continent map,navigation etc. and can be used in various projects.