基于GIS的地图局部显示算法

基于WebGis的系统，都有大量的地图数据需要处理，这些地图数据和处理的结果要在服务器端和客户端交流传递，需要大量的网络数据传送，容易造成用户网页浏览延迟。把大幅的地图经过切片处理，分切成多幅小的切片，引入Ajax技术，设计高效的地图局部显示算法，使客户端和服务器只交换需要更新的切片，不再重新加载不必要的数据，就可以在地图显示和处理的过程中有效的减少网络数据传送。
关键词：WebGis； Ajax； 切片； 局部显示
Abstract: There is a lot of map data needed to be addressed in the system which is based on
WebGis. Furthermore the map data and the results need to be communicated between the server and client , so it requires a large amount of data transmission which can causing the user web browser delayed. Introcducing Ajax technology , separating a big map into a number of small sub-section, designing local map shows algorithm efficiently, the client and server exchange only need to update the slice, no longer to reload the unnecessary data , On the map display and can handle the process of reducing the effective data transmission network
Key Words: WebGIS; Ajax; Tiles; Local Show