Abstract: This paper proposes and implements a methodology for developing WebGIS. Key elements of the methodology include establishment of the self-defined protocol working on application layer of TCP/IP model, implementing communication between client and server based on the self-defined protocol by utlizing Winsock programming and realizing spatial data access interface based on COMGIS development. Based on these technologies, a WebGIS with C/S structure is implemented, andthe feasibility of the methodology is validated.

Key words: self-defined protocol, WebGIS, ComGIS, client/server

摘要： 探索基于自定义协议开发网络地理信息系统的方法。自定义一套工作于TCP/IP应用层的协议，基于该协议利用Winsock网络编程实现网络通信，基于组件GIS开发实现空间数据操作，并在通信接口中加入了自定义的通信可靠性和安全保障机制，实现了一个3层C/S结构的网络地理信息系统，验证了这种开发方式的可行性。

关键词: 自定义协议, 网络地理信息系统, 组件GIS, 客户端/服务器

CLC Number: 

• TP391