Research on Grid Model and Services for Spatial Geographic Information Dissemination

Geographic information grid dissemination system(GIGD) for disseminating spatial geographic information(SGI) to remote user is presented.Grid resource nodes,presented according to the graph theory,are defined.The relationships among SGI,grid resources and GIGD formal presentation are established.Six grades grid hiberarchy oriented to services and a series of user-defined grid services based on OGSA services and interfaces patterns are designed.GIGD flow without grid center is implemented to support request/response model.The performances of grid services and copy mode in the process of resources location are tested.The results show that Grid Services can achieve SGI dissemination effectively as copy mode,faster in maxiam transferring speed while less dependent on data flow.