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According to the defects of Common Search Engine on retrieving Geographic Information Web Services(GIServices),a web service crawler based on topic-relevance was designed and proposed in this paper.Firstly,this paper analyzed and defined the topic features of GIServices by utilizing Vector Space Model(VSM),which could facilitate the representation and calculation of topic features.Secondly,based on the introduction of calculation of topic weight,the paper presented an algorithm to analyze the si...