【摘要】 在元数据标准的基础上,通过论述元数据目录服务的框架结构以及建立在元数据目录服务基础上的G IS Portal的模型,为更好的数据共享提供解决方案,使得用户能够快速准确地获取所需地理空间数据。更多还原

【Abstract】 At present,the requirement of geo spatial data sharing is becoming more and more compelling. Though there are huge geo spatial data available,it is extremely difficult for users to get data they want efficiently and exactly.The metadata of earth science data which is called geo spatial metadata allows a producer to fully describe a dataset.So users can understand the assumptions and limitations and evaluate the dataset’s applicability for their intended use.In this paper,geo spatial metadata and the metadata standards for geo spatial data are introduced firstly.Then based on the metadata standards,the paper illustrates the architecture of Metadata Catalog Service and the model of GIS Portal which is based on the Metadata Catalog Service,providing the solutions for better data sharing and enabling the users to get the geo spatial data they demand exactly in the most efficient way.更多还原