Abstract
Designed as semantic structures to support the sharing and reuse of geographic data, spatial ontologies have recently gained attention within the geo-information community. Geographic ontologies are designed to provide a common understanding of the structure of geographic models, and to support the development of geographic information systems that are conceptually complex. This paper proposes an approach for merging spatial ontologies based on three complementary modules: matching, mapping and merging. A Spatial Ontologies Integration Tool (SOIT) is also developed and applied to the road domain.