实时富客户端WebGIS框架研究与实现

RESEARCH AND IMPLEMENTATION OF REAL-TIME RICH CLIENT WEBGIS FRAMEWORK

为解决传统WebGIS应用中存在的实时性不强、用户体验差等问题,基于RTMP协议、Red5开源框架,设计一种实时RIA WebGIS框架。利用数据库触发器实现更新空间数据的即时分发;利用RTMP协议实现客户端与服务器之间地理空间数据高效传输;利用Red5 SharedObject实现更新数据多类型客户端实时推送;利用Flex技术进行客户端空间信息展示。在气象监测预警系统中对该框架的可行性进行验证,为实时RIA WebGIS的开发应用提供新的方法和思路。

To solve the problems in traditional WebGIS applications including poor real-time property and user experience,we design a real-time RIA WebGIS framework based on RTMP protocol and Red5 open source framework.It uses database triggers to realise immediate distribution of the update spatial data,uses RTMP protocol to achieve efficient geospatial data transmission between the client and the server, uses Red5 SharedObject to implement the real-time push of update data to multiclass clients,and makes use of Flex technology for spatial information display on clients.The feasibility of the framework is verified in meteorological monitoring and early warning system,it provides new methods and ideas for the development and applications of real-time RIA WebGIS.