WFS Feature Semantic Retrieval Based on Ontology

In order to achieve the semantic of feature from multi-WFS services,we propose a five-tuple feature ontology model.Firstly,the automatic construction methods about feature ontology are employed.Then,the multi-spatial relations are formalized among features.We extend the inference rules with logic and spatial reasoning to implement the reasoning retrieval on features.Finally,based on the ontology model and the combined inference rules,we give the algorithm of feature semantic retrieval.The results show that the method is supered usability.