基于VML和脚本技术的WebGIS研究与实现

Research and Implementation of WebGIS Based on VML and Script Technique

传统的WebGIS开发既要部署后台GIS服务器,又要进行Web服务器的配置以及两者之间的连接,有时还会对客户端的环境提出要求,其过程复杂,使用过程又受到网络资源和服务器容量的限制。提出一种基于VML和脚本技术的WebGIS架构,利用VML表达地理空间信息,利用脚本实现GIS功能。这种架构将WebGIS应用分布到客户机上,由客户机运用得到的数据和脚本引擎文件实现WebGIS应用,充分利用了网络中每个结点的资源,既简化了开发过程,也大大提高了服务的可靠性。

The traditional method of WebGIS development consits of the configuring of the GIS server and the Web server and the con- necting among them. Sometimes the client is even asked to install some extra thing. So the process of the development is very complicated and using it always meets the limit of the source of the Intemet and the capability of the server. Brings forward a framework of WebGIS based on VML and script technique. In this framework, VML is used to express the geography data and script controls the data to implement GIS function. Using this framework makes the most of the client to implement WebGIS. It increases the credibility of serving as well as simplifies the process of development.