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《Geotectonica Et Metallogenia》 2004-04
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RESEARCH AND APPLICATION OF GEOLOGICAL 3D INFORMATION MODEL

BAO Shitai, XIA Bin, CUI Xuejun and LI Hua~(1,2) (1. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, GD 510640, China; 2. Graduate School, Chinese Academy of Sciences, Beijing 10039, China)  
Currently geological data are mostly represented on 2D map that is short of 3D visual representation and is difficult to be computerized and analyzed visually, hence it is significant to study and apply geological 3D model in fields such as tectonics and geological resource exploration. An extendable geological 3D Information model practicably built will include both data model and visualization model. Original data focusing on geological exploration are mostly discrete, and a static structure model can be built based on UML and be stored by spatial database of GIS. Continuous data on strata surface and body can be produced from original data by vector lay construction. In horizontal direction the strata surface can be built by interpolating with cubic splines. In vertical direction the strata section can be built from TIN model by constraint algorithm Of Delaunay triangle and the 3D body of strata can thus be stimulated. Popular OpenGL is applied to the geological 3D visualization model, which can represent the three-dimensional original data, the geological body, and the surface of feature layer, such as a stratum. In the visualization model geological body can be operated by mouse or keyboard, such as rotating, moving, zooming free, lifting lens, rotating, tersely setting the color and texture of surface and stratum. Also we can analyze visually by interactive slicing geological body from any direction and depth, and from any query information of stratum. The scene can be saved and restored, too. With component-based development, a system of geological 3D information model is established, which succeeds in building and applying a 3D model and analyzing visually geological exploration in city. The model can be reused and extended in three levels, being capable of extending the layered features of original data in static structure model, optimizing arithmetic in computing mode, and taking full advantage of OpenGL in visualization model. The model is worthy of popularization.
【Fund】: 广东省科技成果推广项目(编号2003C40205);; 国家自然科学基金项目(编号40072022);; 中科院知识创新工程项目(编号KZCXZ-SW-117)资助.
【CateGory Index】: P208
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