Component Communication for Browser/Server-based Internet GIS

Based on analyzing characteristics of distributed geography information, and summing up different construction methods of Internet CIS such as CGI, Plug-in,ActiveX,Java and so on,the paper presents the requirement of Internet GIS to meet access and processing of DGI(distributed geography information). There are distributation, interoperability and componentization. Completely different from traditional GIS software data model, the communication between Browser and Server has to be taken into account in Internet GIS. Generally, it is the basic characteristic of Internet 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 receiving data for both sides;③How to process multi-request from Clients. Accessing to Browser/multi-Server architecture-based Internet GIS,and combining with the concept of component,the paper defines 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 information 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.