| Grid has become a hot issue of research on sharing and cooperating of Internet resource throughout the world now. 'Within the domain of Spatial Information Science, Spatial Information Grid and Grid GIS were proposed to solve the sharing and cooperating of Spatial Resource in the grid environment.The dissertation proposed Spatial Data Grid to improve the status of spatial resource sharing and applicating, because Spatial Information Grid and Grid GIS need to be researched in detail, and sharing of spatial data is in urgent need. Spatial Data Grid is a technology system which aims at spatial data sharing and cooperating and integrates spatial data into a single image of Spatial Data Grid in the grid environment.The metadata catalog and data broker of Spatial Data Grid integrate the metadata catalog of grid to offer an uniform logical view for the client, Thus realize the cooperation of catalog server. They also dispatch the data source correctly by monitoring the service stasus of data server, and integrate the data source of data server for the client by the function of data integrating of data broker. This realizes the cooperation of data server.About the concept, support technology, architecture and key technolyg of Spatial Data Grid, the main work of the dissertation concentrated in the following parts:1. Discussed research value of Spatial Data Grid and research status of Grid, Data Grid, Spatial Data Grid and spatial data sharing, which are the related technologies of Spatial Data Grid. SIG is the product of syncretization of Grid and Spatial Information Science. Spatial Data Grid is for the detailed research of SIG The development of Spatial Data Grid is helpful to improve the status of spatial data sharing. SIG began to be studied a short time ago. And an uniform architecture of SIG is need to be formed now.2. Discussed basic concept and content of Grid, Data Grid, SIG, Grid GIS and Spatial Data Grid. And also the relationship among them with middleware technology, distributed computing, Peer-to-Peer, Web GIS and OpenGIS.Grid GIS is an important part of SIG Grid GIS can be divided into five part in the view of grid, including Basal Grid, Spatial Data Grid, Spatial Information Grid(in narrow sense), Spatial Knowledge Grid and Spatial Service Grid. Grid GIS is the upgrading of Web GIS in grid environment. OpenGIS is still an important part of Grid GIS.3. Summaried the support technology of Spatial Data Grid, including Grid, Web Service, OpenGIS and P2P. The function of them was also discussed.4. Researched on the architecture of Spatial Data Grid, including archor point of technology, protocol architecture, component architecture, network model and typical activity view. The existing resolvent of software for spatial data sharing and the characters of Spatial Data Grid were also discussed.Spatial Data Grid did not produce any new protocol. It was completely based on the protocols and specifications of W3C, OGSA and OpenGIS. The architecture of Spatial Data Grid is composed of client, catalog server, data server and certificate administrator. Catalog server is the core of Spatial Data Grid. It consists of metadata catalog and data broker.5. Proposed a mixed network model based on C/S and P2P. It can improve the expansibility of Spatial Data Grid. And it is used to realize the cooperation of catalog server of Spatial Data Grid. Thus Spatial Data Grid can propose a uniform logical view of all spatial data for clients.6. Researched on the metadata catalog of Spatial Data Grid. The metadata catalog offers an uniform mode to name, publish and access all kinds of data source of Spatial Data Grid.7. Researched on the data broker of Spatial Data Grid. The data broker mainly realizes the function of catalog integrating, data querying, data accessing and data integrating. The data broker dispatch the data source correctly by monitoring the service stasus of data server, and integrate the data source of data server for the client by the function of data integrating of data brok...
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