Clearinghouse(数据交换中心)与数字化地理信息共享

Clearinghouse & Digital Geographic Information Sharing

随着 Internet技术的飞速发展和网络应用的普及 ,用户通过 Internet快速、准确地获取和共享地理信息已是大势所趋。采用数据交换中心 Clearinghouse机制是实现地理信息共享的重要方法之一。作为集中式服务系统 ,Clearinghouse提供一个虚拟信息空间 ,存储大量元数据 ,实现数字化地理信息的获取和发布能力 ,并已广泛用于许多国家的地理信息共享实践中。本文介绍基于 clearinghouse数字化地理信息共享的体系结构、相关技术和实现方法 ,涉及三层服务体系结构、元数据、Z3 9.5 0协议和语义映射等。最后扼要介绍采用 Java Servlet、VB和 Map Object开发的基于 clearinghouse的数字化地理信息共享原型系统 ,它具有元数据提交、数据上载、信息组合查询、地理信息图形显示。

With amazing development of network technology,through Internet to access geographic information is the basic need for the users.As an integrated service system,clearinghouse is one of the ways to realize it,which provides a virtual information space,where,a lot of metadata are stored,to complement digital geographic information access and publish.In this paper,clearinghouse based geographic information sharing architecture has been put forward,moreover,the related technologies and realized methods have been described,including three tire system,metadata,Z39.50 and semantic map.Finally, the prototype of clearinghouse based geographic information sharing has been presented.