地理信息系统集成平台框架结构研究

提出了基于客户／服务器结构的地理信息系统集成平台总体结构，探讨了基于元数据的地理信息系统数据集成平台以建立物理上分布而逻辑上集中的分布式地理信息系统数据库，提出了应用符合３ＮＦ范式的关系数据库进行模型管理的模式，在此基础上探讨了地理信息系统可视化建模工具。

Study on GIS Integration Platform Framework Architecture

With the fast development of GIS applications, more and more practical GIS systems have been built, and it is imperative to integrate those systems into a more powerful and convenient system. This article puts forward the concept and framework of GIS integration platform which includes including GIS data integration platform and GIS model integration platform. We first put forward an client/server system architecture as an overall system architecture of GIS integrity platform. By defining Client request, GIS Data Integration Server, GIS Model Integration Server, Application Model Server, and GIS, RS, RDBMS Server, their function and interaction are discussed. In this Architecture, GIS Data Integration Server and GIS Model Integration Server are two key issues to be addressed. As for the GIS data integration platform, a metadata based method for practical concern is suggested. We divide GIS data into four categories: RS image data (Raster), RS classification data (Vector), digital map data (vector) and relational data (Attribute). Each GIS data set registers its metadata information in the platform. Through meta database management system we can link those data into an integrated one by RS image serial number and attribute foreign key. The platform provides GIS information retrieve, GIS model data request and mapping function in integrated, visual and interactive way. As for the model integration platform, We establish a database management system to construct, add, delete or modify GIS model by decompose each model into three levels items which are model level, function level and variable level. Items in each table are standard 3NF compatible, the management system links those relational tables together and provides those functions through relational operation in real time needs. A visual model construction tool is necessary in complex GIS application since it may be lack of off hand model suitable to solve the problem. We provide a GIS visual model construction tool based on the client/server system architecture and relational model based management system.