Distributed Geographical Vector Data Sharing
分布式海量矢量地理数据共享研究

The application of geographical data is extending to various fields rapidly. However, geographical data acquirement is very cost, so the sharing of geographical data is needed in order to save users expense. There are many excellent works about raster data sharing in multimedia field, but vector data, especially very large volume geographical vector data sharing is rare. This paper discusses several problems about geographical data sharing in distributed environment. The first is data management in server, which need manage various data and utilize spatial data structure to support efficient data retrieval. The second is the data transportation between server and client, very large data volume and realtime response to user operation require that meet users maximum need by the minimum data transformation. The third is geospatial data visualization that provides information but only data. The last is the data safe problem, which including data control, digital signature and data watermarking technology.