For the optimal use of the spatial data in the interoperable environment, the gradual process of GISs have begotten SDI technologies. The main goal of SDI is to facilitate data sharing and informing about spatial data and creating an interoperable environment for users in order to access data. It’s necessary to provide an appropriate base for analysis, decision making and planning to create interoperability between the various spatial information systems. The most important problem in respect with spatial data exchange among different organizations is semantic interoperability in order to discover common semantics of data of other organizations. Using Ontology with the formal specification the relations between the phrases in SDI, leads to the promotion and enhancement of semantic data sharing and retrieving spatial data. Since the start of SDI, different abilities and services were designed for it and also those are developing from the first generation SDI to the second and to third generation in the lapse of time. and we can observe these developments and enhancing of the capabilities. Semantic web has been appeared in third generation of SDI to resolve the semantic heterogeneous. SDI based on ontology has the main role to facilitate decision making in enabling the spatial knowledge of the societies. In this research, in order to solve semantic heterogeneous, ontology is used in Catalog Service of SDI for the roads class of the classes of the phenomenons in SDI pattern of two diverse organization. And also, accuracy and efficiency tests of two designed ontology for two assumed organizations Ministry of Road & Urbanism and National Cartographic Center of Iran, to find similar concepts are accomplished based on implementing ontologies in catalog service and matching ontologies algorithm and many found matched results are achieved.