Data and Metadata: Two-Dimensional Itnegratio nof Heterogeneous Spatial Databases

摘要

In this article, we propose a methodology of integration of heterogeneous spatial databases. A canonical spatial data model is, initially, defined. This model of geographical cooperation (Geocoopm) belongs to the family of terminological logics within which everything is defined in terms of concepts and roles. It enables, thanks to the function of subsumption, the classification of these concepts just only from their declarative syntax. The methodology we proposed is based on three steps: (1) In the first instance, we build a hierarchy of global attributes which shows the differnet relations between attributes (composition, inclusion, ...). (2) An initial version of the integrated schema is processed. This integrated schema models the different relationships between concepts (composition, subsumption). This process uses the hierarchy of attributes, the subsumption function and a set of rules. (3) Finally, we enrich this schema, rearranging it using restructuration operators and metadata (resolution, geometrical type ...) in an effort to obtain the most accurate and complete integrated schema.