空间信息格网框架体系和关键技术分析

Architecture and Key Technology of Spatial Information Grid(SIG)

空间信息格网 (SIG)是格网 (Grid)技术在数字城市等地球信息应用服务领域中的具体应用。本文首先分析了格网兴起的背景以及国内外在格网领域的研究进展 ,然后建立了格网三层体系结构 ,提出了格网操作系统中基于 XML 的格网资源描述语言的资源管理方法和多层格网节点分治式格网任务调度管理方法 ,最后提出了基于空间智能体的空间信息格网的体系结构 ,并且探讨了空间信息格网中空间信息连通性和一致性、空间信息格网的智能化等一系列重点问题。

The Grid refers to an computer network infrastructure that enables the geographical distributed computing resource,storage resource,network resource,software resource,data resource,information resource et al, to be integrated into a logistic one.Grid can provide integrated information application services for users as if it were a supercomputer.Now Grid has become a hot issue of reserch and development throughout the world. Spatial Information Grid (SIG)is the fundmental application of Grid technology in spatial information application service fields such as digital city. In fact, Spatial Information Grid is an intelligent information infrastructure providing integrated spatial information application services for users by using existing spatial information infrastructure and spatial information network protocol standard.In this intelligent information infrastructure, spatial information processing is distributed and intelligent user can acess spatial information resource through only one logistic portal. The architecture and key technology of spatial information grid are the most important issues.In this paper,at first,the background of thriving and prosperous Grid reserch and the proceeding of Grid research in China and abroad are analyzed.Based on Open Grid Services Architecture(OGSA),the Three-Layer Grid Architecture Model(Grid resource layer,system management layer or Grid Operating System,application service layer) is established,then the XML based Resource Markup Language(RML) as the resource information describing language in resource management and multi-layer grid node autonomous task scheduler in grid operation system are presented,At last,the Geo-Agent based Architecture of Spatial Information Grid is presented, it is a prototype of Common Agent Request Broker Architecture(CARBA) application in spatial information domain.Some important issues in Spatial Information Grid such as spatial information express and spatial metadata, spatial information connection and coherence, the intelligentization of Spatial Information Grid and the security of Spatial Information Grid are discussed. Spatial Information Grid will influence the development of Large-scale Geographic Information System deeply. Spatial Information Grid will also boost the evolution of digital city and digital earth.