利用矢栅混合数据模式解决WebGIS技术难题——浏览器调阅空间数据速度问题

Applying combined data structure to solve the technical problem of WebGIS——the speed of dispatching and displaying spatial data

空间数据库是比一般的数据库要复杂,尤其在WebGIS中更是如此。因为网络传输和带宽的限制,因此如何有效地进行空间数据的调度和显示就成为WebGIS的技术难点。通过构造矢量和栅格混合WebGIS系统数据结构,并在服务端和客户端建立各自的多级缓冲,采用多线程调度方法,解决一直影响WebGIS系统运行速度瓶颈即网络带宽所带来WebGIS运行速度慢问题,提高WebGIS软件调阅空间数据的调度速度,加快页面响应时间。试验表明,利用矢栅混合数据模式能够有效提高WebGIS系统的空间数据调阅速度。

We all know that a spatial database is more complex than an ordinary one,especially in WebGIS.Therefore,efficiently dispatching and displaying spatial data became a key problem due to the limit of TCP/IP protocol and bandwidth of network.Based on combined data structure,build up multi-level buffer storage on each server and client,and utilize multi-thread strategy lastly,to improve the dispatching of spatial data and response of paging.The test proved that applying combined data structure could efficiently speed up the spatial data dispatching and displaying in WebGIS.