对象式WebGIS的分布操作模型

Study about Distribution and Interaction Model of WebGIS Based on Object

面向对象和分布式计算技术的发展促进了WebGIS向分布式、组件化方向演变。将分布式体系和面向对象的思想引入GIS系统,是GIS发展的必然趁势。概括分布式技术下WebGIS的现状和发展,分析目前WebGIS的不足和缺陷。在对Allan Doyle分步骤模型研究的基础上,提出WebGIS的分布互操作模型。最后,给出一种基于CORBA的WebGIS实现模型。它能充分利用服务器端资源,支持多用户的并发操作,具有较高的安全性和与客户端平台无关的优点。

With the development of object -oriented and distributed computing technology,WebGIS is developing in the direction of distribution and component. The structure of distribution and the idea of object -oriented is the inevitable trend of its development. This article analyses the shortage of the presented WebGIS, and studies about system framework Allan Doyle＇s step - model of GIS. A distribution model of WebGIS and implementation model of WebGIS based on CORBA are proposed. It makes full use of the resource of server and supports operations of multiple users simultaneously,it has high security and is independent of the client platform .