Distributed Heterogeneous Spatial Data Sharing Service

Information sharing has been an important sign of the development of the modern information society. In recent years, with the construction of National Spatial Information Infrastructure (NSII), National e-Government and Based Information of National Nature Resources and Geographical Space, the use of GIS in crossing department and crossing industry is becoming wilder and wilder and spatial information sharing is becoming more and more important. However, to make the most of the existing data resources to really realize the sharing of spatial information, we must solve the problem of the integration of distributed heterogeneous spatial data.This paper provides two patterns of spatial data sharing service, one is physical data center, and the other is logistic data center. We think the later pattern is more rational and effective. So we make it as the design way by which we provide the whole resolution.Based on the unified data modeling, this resolution realizes the uniform request service to distributed heterogeneous spatial data by metadata and multi-database system. This paper emphasizes the theories and the principles of metadata management and multi-database management, and makes specifications of the key technologies of Seamless Integration of Multiple Heterogeneous Data Sources(SIMHDS) and Local Data Sources Agent. At last, a case is given to prove the resolution.