Internet GIS海量空间数据发布的关键技术  

Internet GIS for distributing massive geospatial data

作　　者：朱江[1,2] 张立立[1,2] 宋关福[1] 钟耳顺[1] 

机构地区：[1]中国科学院地理科学与自然资源研究所,北京100101 [2]中国科学院研究生院,北京100039

出　　处：《高技术通讯》2006年第3期286-289,共4页Chinese High Technology Letters

基　　金：863计划（2003AA133020）资助项目.

摘　　要：本文介绍在Internet环境，尤其在低带宽的情况下，有效进行海量空间数据（矢量数据和栅格数据混合）发布的实现技术。提出基于服务器端计算技术的多层体系结构，并对这种体系结构的特点进行了分析。重点阐述了影像管理与金字塔压缩、多因素规划动态平衡群集和多级缓存等海量空间数据发布的关键技术。Timely and accurate spatial data has been regularly available in many fields such as land cover and land use, urban planning, etc. Internet GIS is the technology to distribute massive geospatial data composed of aerial, satellite, and topographic images which is stored in RDBMS such as Oracle or SQL Server. Internet GIS is predominantly designed under a thin-client/fat-server pattern. The pure thin-client technique provides the ability to access large geospatial database via the Internet by graphical web browser without any plug-ins. Server-side＇ s overload because of frequently geospatial data access and geocomputing process is the bottleneck. Some key techniques, such as image-tower compression, multi-factorial dynamic load-balancing and multi-level caching, are elaborately designed to overcome the disadvantages in the paper. A Multi-tier architecture of Internet GIS based on the techniques is designed to adapt adequately over low-speed （28.8kbps） network.

关 键 词：INTEMET GIS 海量空间数据 影像金字塔 动态负载平衡 多级缓存 

分 类 号：TP311.131[自动化与计算机技术—计算机软件与理论]