Modelling and Manipulating Objects in Geoscientific Databases
نویسندگان
چکیده
This paper presents a database interface for geo-scientifit applications. It is based on a “geoobject model” derived from an extended entity-relationship model, so that geoscientific objects and their representation in maps can be described. Special datatypes are used for geometric and temporal attributes. Then a database language is introduced which integrates object model and datatypes: Queries and updates can be formulated by mostly descriptive means, and their semantics is explainable by an object calculus adapted to the model. In addition, standard operations like map construction are supported.
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