基于DCOM的分布式WebGIS架构与关键技术  

Architecture Design and Key Technology in Development of Distributed COM-Based WebGIS System

作　　者：童小华[1] 伍吉仓[1] 李金标[1] 

机构地区：[1]同济大学测量与国土信息工程系

出　　处：《同济大学学报（自然科学版）》2005年第8期1102-1108,共7页Journal of Tongji University:Natural Science

基　　金：国家自然科学基金资助项目(40301043);国家'八六三'高技术研究发展计划资助项目(2002AA134050);测绘遥感信息工程国家重点实验室开放研究基金资助项目(WKL(03)0301)

摘　　要：探讨了基于DCOM(分布式组件对象模型)的分布式WebGIS(网络地理信息系统)架构,及其关键技术的研究和实现.设计了一种新的数据模型SHAPE2D来组织客户端空间数据,并对中间件的设计、空间数据的优化组织、多分辨率显示、空间数据存储和数据库模型与结构等进行研究,提出了WebGIS中空间数据的压缩方法、矢量与栅格传输的综合平衡策略.最后,应用SHAPE2D客户端数据结构以及网络综合平衡策略,基于系统的快速定制机制,建立了房屋土地分布式WebGIS应用系统.该系统验证了本文的各种理论与方法是切实可行的.A distributed WebGIS architecture is proposed on the basis of the distributed component object model technology and some key issues for the distributed WebGIS development are presented in this paper. A new data model named SHAPE2D is first developed to organize the spatial data in the clients. Five issues in the distributed WebGIS development are then studied, including the middleware design, data organization mechanism, data multi-resolution representation, spatial data storage and database model and structure. The spatial data compression method and the balance strategy between the vector and raster data transmission are further investigated to optimize network transmission. Finally, by taking land and housing WebGIS development as an example, the design and fast customization of a WebGIS system are discussed. The feasibility of the theories and methods is verified through the system.

关 键 词：网络地理信息系统 分布对象计算 分布式组件对象模型 中间件 空间数据组织 

分 类 号：P208[天文地球—地图制图学与地理信息工程]