To solve the problem of chaining distributed geo-graphic information Web services (GI Web services), this paper provides an ontology-based method. With this method, semantic service description can be achieved by semantic annotation of the elements in a Web service description language(WSDL) document with concepts of geographic ontology, and then a common under-standing about service semantics between customers and providers of Web services is built. Based on the decomposition and formal-ization of customer requirements, the discovery, composition and execution of GI Web services are explained in detail, and then a chaining of GI Web services is built and used to achieve the cus-tomer’s requirement. Finally, an example based on Web ontology language for service (OWL-S) is provided for testing the feasibil-ity of this method.
