期刊名称：ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
印刷版ISSN：2194-9042
电子版ISSN：2194-9050
出版年度：2002
卷号：XXXIV Part 4
出版社：Copernicus Publications
摘要：With the increasing number of digital maps and other geo -referenced data that are available over the Internet, there is a growing need for access to techniques that allow us to preview the content and to evaluate it relative to the requirements for complex spatial and thematic queries. . Analogous to the digital indices for full- text searches o n text documents , we introduce highly condensed, machine- readable indices of digital maps. The purpose of these "intelligent thumbnails" is to support sophisticated queries of the type concept@location. An intelligent thumbnail is based on a projection of the thematic content of a digital map onto a standard reference tessellation. To make the thumbnail exchangeable in a distributed and heterogeneous environment, the underlying Standard Reference Tessellation (SRT) is qualitatively abstracted from a polygonal representation to a connection graph. In combination with a hierarchical place name structure and concept ontology, it is used to evaluate the spatial and thematic relevance of the indexed data sources with respect to spatio-thematic queries
关键词：digital maps; metadata; spatial queries; data reduction; spatial ; reasoning
