Study Of Spatial Data Distribution And Sharing Mode Based On Caching

Based on the establishment of spatial data center, and discusses the spatial data released on caching and sharing mode. Using a relational database (RDBMS) storage spatial vector data and raster data, using the client cache, improve the technology of spatial data access speed, puts forward the client and the server and client interaction between the basic model of spatial data sharing. Around the theme probes into several key questions:(1) The establishment of the spatial data index. Analyses the main spatial index technology, chose index based on grid technology, puts forward the index of multi-level index of grid technology improvement,(2) Database structure design. Database structure is the spatial data access and release the cornerstone of the design of the data, data collection - space objects - the three layers of data storage system,(3) Caching data structure design. Caching data access speed is the key of vector data and raster data has made the corresponding design,(4) Based on the spatial data cache and work mechanism of middleware. By the way of object-oriented middleware, data access to the working mechanism of middleware is discussed.