Internet GIS空间数据通讯的部件化构造方法

Component Communication for Browser/Server-based Internet GIS

在分析分布式地理信息特征的基础上，提出了满足分布式地理信息获取与处理的InterntGIS的要求。针对InternetGIS的浏览器／多服务器体系，结合部件化概念，定义了测览器端与多服务器端数据请求与获取部件的数据结构，解决了分布式地理信息查询的问题。最后用一个应用系统实例加以说明。

Based on analyzing characteristics of distributed geography information, and summing up different consruction methids of Intemet CIS such as CGI, Plug-in,ActiveX,Java and so on,the pape presents the requirement of Intemet GIS to meet access and processing of DGI(distributed geography informaion). There are distributation, interoperability and cornponetization.Completely different han traditional GIS software data model, the communication between Browser and Server has to be taken into account in Intemet GIS. Generally, it is the basic charac-teristic of Intemet GIS to access data from a machine and process data in another one. This paper tries to solve the problems as follows: ①How to send mp to Server and get response to Client-side; ②What is the appropriate spatial data structure of sending and receving data for both sides;③How to process multi-request from Clients. Accessing to Browser/multi-Server architec-ture-based Internet GIS,and combining with the concept of component,the paper difines spatial data structure to access and response spatial data to communication between Browser-side and multi-Server-side. The data structure is fit for distributed data access and management after project application. By the construction method, the problem of distributed geography informaton querying and accessing spatial data may be solved. Finally,an application, which is based on Inter-net GIS-GeoSurf acts as an example to explain ideas as above.