关键词: 语义相关度, 语义检索, 本体, 空间查询, 语义距离

Abstract: Semantic relevancy is the key basis for sorting results of semantic retrieval order by relevance.Oriented semantic spatial retrieval in GIS，an algorithm of semantic relevancy based on the spatio-ontology and the theory of spatial topology on geo-information science is proposed.The integration of literal relevance and semantic relevancy is considered in this algorithm.And the mechanism of the weight of ontology relationship is adopted for controlling the ontologies relevance in different semantic retrieval applications.The algorithm of semantic relevancy taking great effect in semantic spatial retrieval is proved by experiment.At the same time，the algorithm also provides good reference value for application in other fields.

Key words: semantic relevancy, semantic retrieval, ontology, spatial query, semantic distance