The use of geographic data through Web services shows the geospatial Web Services (GWS). A growing number of GWS designed to interoperate spatial information over the network have emerged. GWS are changing the way in which spatial information systems and applications are designed, developed, and deployed [1]. When GWS is increasing, the difficulty of the service discovery increases too. The service discovery represents one of the interactions between Web service components (supplier, customer and UDDI). It is unfortunately that it is based only on the syntax. The semantic aspect necessary to satisfy the user is absent. The use of semantic Web technology in the Web service discovery phase gives rise to the Web service semantic discovery. The latter is based on semantic reasoning. It enhances the accuracy of search results compared to traditional techniques of Web service discovery, the additional matching accuracy in terms of computing power. In this paper we are interested to the GWS semantic discovery based on geographical metadata held in geo-catalogs. The metadata used in our case is designed according to the ISO 19119 standard reinforced by the quality criteria.