A geospatial search engine for discovering multi-format geospatial data across the web
A geospatial search engine for discovering multi-format geospatial data across the web
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DOI：
10.1080/17538947.2014.966164
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发表时间：
2016-01
影响因子：
5.1
通讯作者：
C. Bone;Alan Ager;K. Bunzel;Lauren Tierney
中科院分区：
文献类型：
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作者：
C. Bone;Alan Ager;K. Bunzel;Lauren Tierney
由于基于服务器的技术的进步和现在创建数据的便利性，网上可通过电子方式获得的地理空间数据量正在迅速增加。然而，在将搜索地理空间数据的个人与存在此类数据的服务器和网站连接起来方面仍然存在挑战。本文的目的是提出一个虚拟可用的地理空间搜索引擎（GSE），利用网络爬虫建立在谷歌搜索引擎的顶部，以搜索网络的地理空间数据。爬虫播种机制将用户输入的搜索词与标识地理空间数据服务的预定义关键字相结合。每天都会运行一个过程来更新地图服务器图层和元数据，并消除脱机的服务器。GSE支持Web地图服务、ArcGIS服务和具有地理空间数据可供下载的网站。我们应用GSE搜索这些格式下的所有可用地理空间服务，并提供搜索结果，包括所有获得的服务的空间分布。虽然我们的GSE和网络爬虫技术的增强一般摆在面前，我们的工作是实现一个可访问的工具，发现地理空间数据的全球可用性的潜力的重要一步。
The volume of publically available geospatial data on the web is rapidly increasing due to advances in server-based technologies and the ease at which data can now be created. However, challenges remain with connecting individuals searching for geospatial data with servers and websites where such data exist. The objective of this paper is to present a publically available Geospatial Search Engine (GSE) that utilizes a web crawler built on top of the Google search engine in order to search the web for geospatial data. The crawler seeding mechanism combines search terms entered by users with predefined keywords that identify geospatial data services. A procedure runs daily to update map server layers and metadata, and to eliminate servers that go offline. The GSE supports Web Map Services, ArcGIS services, and websites that have geospatial data for download. We applied the GSE to search for all available geospatial services under these formats and provide search results including the spatial distribution of all obtained services. While enhancements to our GSE and to web crawler technology in general lie ahead, our work represents an important step toward realizing the potential of a publically accessible tool for discovering the global availability of geospatial data.