【摘要】 面向在线空间信息的搜索引擎是空间信息共享和互操作领域一个新的研究内容 ,为了帮助用户能够自动地找到感兴趣的空间信息 ,提出了一种遵循 Open GIS WMS规范构建的空间信息搜索引擎系统原型 ,并详细介绍了研究背景、设计方案、系统实现以及性能测试结论。实践证明 ,该搜索引擎不仅能自动地搜索互联网上的 WMS服务器 ,并能不断更新和维护相关的 WMS信息数据库 ,还能根据用户的查询需求实现动态的服务连接和透明的空间信息获取更多还原

【Abstract】 Spatial Information Search Engine (SISE), aiming to search the World Wide Web for online geographic information to meet the end users needs, is totally a new research area in the field of spatial information sharing and geographical information system interoperability. In this paper we propose a prototype system of SISE based on the OpenGIS WMS specification. The system architecture, working principles, detailed function of each component, implementation strategies and system performance test results of this SISE prototype are introduced. This SISE prototype is capable of discovering available WMS Servers dynamically, saving and updating capabilities information of them into relational databases and maintaining necessary R tree indexes. For each spatial information request from clients, it can choose qualified WMS servers according to the request autonomously and fetching the matched geographical information for them from remote WMS servers transparently.更多还原