Extending the database relational model to capture more meaning
ACM Transactions on Database Systems (TODS)
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A rational territorial management requires that all the amount of geographical data (maps, aerophotos, satellite images but also statistics, etc ...) be unified and made accessible to the decisional entities, which can use them as means for an adequate planning of the actions to undertake. Therefore the concept of data base (or DB) and the relative techniques offer the suitable means, as they give to the user a clear view of the data, an access and computational language oriented to the user, and the capability to support in a simple way the process (often heuristic) of solution of the management problems.The extended relational model [1] is adequate for this kind of problems for its simplicity, semantic completeness, and descriptive power. The access language to the DB represents an extension of AQL [2] that, besides supporting the DB management operations and the possibilities of interactive computation of AQL, offers the integration with the geographical operations and data geographical type. The proposal is illustrated by means of a series of examples of inquiry against a geographical DB.