面向在线空间信息的自动化搜索

Analysis of the Automatic Search for Online Spatial Information

近年来,越来越多的空间信息实现了在线发布和在线更新。但这些在线空间信息的分布广泛性和发展无序性导致了最终用户难以找到所需的在线空间信息,因此面向在线空间信息的自动化搜索已经成为空间信息共享的一个重要研究内容,其设计目标为自动地帮助用户寻找感兴趣的空间信息。论文从互联网上空间信息的存在形式和提供方式入手,分析了网络空间信息系统的一般结构;通过从搜索对象、搜索方法和用户界面等方面对通用Web信息搜索和面向空间信息搜索进行了比较,得出了实现在线空间信息的自动化搜索必须首先规范化网络空间信息系统的结论,最后总结了面向空间信息的搜索需要解决的困难并分析指出其研究的主要内容。

In recent years,supported by Web Mapping technology,more and more spatial information is available on the Internet including topography-based map data,satellite images,aerial photos and even some metadata etc.But for the end users it is extraordinarily difficult to get access to what they want due to the universal distributing and out-of-order development of spatial information.In this paper we discuss the priciple of automatic search for online spatial information,which has been become an important content of study in Spatial Information Share with the purpose of helping the end users to search the World Wide Web for geographic information conveniently,quickly and transparently.We investigate the architecture of the General Purpose Search Engines(GPSE),such as Alta Vista,Google,Infoseek and so on,and the mechanism of Web Mapping Systems ,which are the main type of geographical information providers on the web.After comparing general web information retrieval and online spatial information retrieval,we point out their main differences and argue that the support of Web Mapping System is absolutely necessarily to fulfill automatic online spatial information search.And based on this result,we conclude that the standardization of Web Mapping Systems is the primary task that should be accomplished.At the end we suggest the great difficulties that need to be solved and propose the research content in detail.