基于元数据的空间数据网络分发系统研究

随着GIS应用的深入,空间数据的可获得性已经成为影响许多从事地理信息系统研究和应用部门发展的重要问题.由于网络中内容和形式各异的海量数据的存在,元数据将为共享数据的快速检索与正确使用提供必要的保证,地理空间元数据是实现异构环境下空间数据共享的主要手段;在分布式环境下,通过元数据接口可以快速地发现各种空间数据服务.对基于元数据的空间数据网络分发系统所涉及的关键技术进行了较为详尽的论述,包括元数据技术、数据压缩技术、数据加密技术等,并给出了整个系统的体系结构.

Research on Spatial Data Network Distribution System Based on Metadata

With the increasing use of GIS, the availability of spatial data has become an important issue that affects the development of many sectors engaging in GIS research and application. Because of the existence of massive data with various contents and forms in network, metadata will become the necessary guarantee for quickly retrieving and correctly using shared data, and geographic spatial metadata is the main means to realize the spatial data sharing in the heterogeneous environment. In distributed network environment, all sorts of spatial data services can be quickly found through metadata interface. The paper detailedly discusses the key technologies which are involved in spatial data network distribution system based on metadata, including metadata technology, data compression technology, data encryption technology, and gives the architecture of the whole system.