On the study of the basic characteristics of geological objects and the special requirement for computing 3D geological model, this paper gives an object-oriented 3D topologic data model.In this model, the geological objects are divided into four object classes: point, line, area and volume.The volume class is further divided into four subclasses: the composite volume, the complex volume, the simple volume and the component.Twelve kinds of topological relations and the related data structures are designed for the geological objects.
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