网格(Grid)是新型高效的分布式计算和资源管理基础设施。分析了空间数据基础设施(Spatial Data In-frastructure,SDI)与网格技术的集成需求,扩展了传统SDI层次体系,提出一种新的SDI—基于网格虚拟组织的SDI(Virtual Organization SDI,VOSDI)。VOSDI突破原有SDI以明确的地区或地域分类分层组织的方式,通过VO对地理上分布的人员、资料及空间信息进行有效组织和整合,具有灵活高效的特性。对VOSDI的功能、特性进行探讨后,进一步提出VOSDI的概念模型,并指出VOSDI实施中可能存在的问题。
Grid computing is deemed as a good solution to the digital earth infrastructure.Various geographically dispersed geospatial resources can be connected and merged into a‘supercomputer’by using the grid-computing technology.On the other side,geosensor networks offer a new perspective for collecting physical data dynamically and modeling a real-time virtual world.Integrating geosensor networks and grid computing in geosensor grid can be compared to equipping the geospatial information grid with‘eyes’and‘ears.’Thus,real-time information in the physical world can be processed,correlated,and modeled to enable complex and advanced geospatial analyses on geosensor grid with capability of high-performance computation.There are several issues and challenges that need to be overcome before geosensor grid comes true.In this paper,we propose an integrated framework,comprising the geosensor network layer,the grid layer and the application layer,to address these design issues.Key technologies of the geosensor grid framework are discussed.And,a geosensor grid testbed is set up to illustrate the proposed framework and improve our geosensor grid design.
