Research on Geospatial Metadata for DE Construction

Massive information and world_covered network bring out the quickly coming of Digital Earth(DE),which makes the geospatial information management,sharing and valid using on Internet more urgent than ever.In order to resolve these problems,the authors researched and discussed the definitions,functions and contents of geospatial metadata,and its implementation of management system based on Web and its application integrated with WebGIS in DE in this paper while allowing for the frontier of international geospatial metadata standard.Metadata is the about data,it is used to describe the contents,quality,presentation,spatial references and management methods of geospatial data and its other properties.Moreover,the geospatial metadata content standard draft has been proposed here,consisting of 8 standard components and 4 referenced components that can only be used with reference to standard components and can not be used independently.Also by making use of the latest Internet technology and integrating with WebGIS,three solutions,namely CGI,the third vendor application and Z39.50,for geospatial metadata network management system(GeoMNMS)have been proposed here.The authors adopted the Z39.50 solution and implemented the GeoMNMS which is based on the Internet and can be used in DE construction.The system has many functions such as User Authorization,Metadata Catalog, Metadata Inpurting,Metadata Query,Metadata Modifying,Geospatial Data/Information Publishing and Sharing on Internet etc.,all of them can be operated on_line.And some of demonstrations of various functions of the system have been presented finally.In the era of global informationization and Digital Earth,the GeoMNMS provides the prototype of managing and using geospatial metadata in DE construction,and it will promote the progress of Chinese standardization and propel the DE construction.