This thesis analyzes the importance and process of progressive transmission,the effects of progressive transmission to network,the structure of spatial vector data and spatial data interaction between client and server.

• 文章介绍了使用渐进传输的原因,并具体分析了渐进传输过程、采用渐进传输对网络的影响、空间矢量数据渐进传输的数据结构及客户端与服务器数据交互过程。