空间信息数据量大、处理复杂、难以共享的问题对其研究和应用提出了挑战。空间信息栅格(Spatial Information Grid，SIG)作为创新性的网络空间信息基础设施和技术体系，集成并拓展信息栅格、空间信息系统、Web服务等前沿技术，以“服务”为中心，实现一体化智能化的空间信息获取、存储、组织、分发、分析处理、应用、融合以及互操作，形成基于网络的空间信息资源共享与集成。在给出SIG基本定义的基础上，明确了SIG技术要素和特征，探索并构建了开放性的SIG框架体系，重点研究了SIG中的空间数据共享和分析处理服务技术，为SIG相关研究的拓展和深入提供了总体框架和技术基础。

The application and research of spatial information are generally considered as a challenging problem due to the excessive voluminousness, complexity of processing and difficulty in sharing of spatial data. As a novel web-based infrastructure and technology system of spatial information, Spatial Information Grid (SIG) integrates and extends information grid technology, spatial information system, web services and etc. To implement sharing and integration of spatial information, SIG takes service as its technical core, and establishes a unified and intelligent platform to acquire store, organize, distrbute, analyze, aggregate, and apply, spatial information. Based on the given basic definitions of SIG, the technical ingredients and research contents are proposed. Then, a system architecture of SIG is proposed and built. Moreover, some key technologise, of SIG, such as spatial data sharing and spatial analyzing services are studied and elaborated. Hences, the system framework and technical foundation of SIG are formed and SIG research is promoted into a new stage.