Abstract
3D geological modeling is an important research issue with the studying of the digital city in china. In view of the deficiencies of present modeling methods, a new method to model 3D geological body including faults based on generalized tri-prism (GTP) model is presented. Four geological knowledge inference rules about 3D geological modeling are put forward. The method mainly includes three steps: a) Process and organize the borehole data. b) Generate Delaunay TIN (D-TIN) of the geological upper surface according to borehole's collar data. c) Extend each triangle of the D-TIN down into GTP along borehole line referring to the four geological knowledge inference rules. The application for 3D geosciences modeling and 3D visualization including 3D interactive visualization, aided design and spatial inquiry etc are introduced. A real-3D geosciences modeling system, GeoMS3D, developed with VC++, OpenGL and SQL sever. An actual 3D geological model of an exploring district is shown as a case.
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