The Research and Application of Geological 3D Information Model
Guangzhou Institute of Geochemistry China
Xia Bin , Cui Xuejun , Li Hua
Currently geological data is mostly represented by 2D map that is short of 3D visual representing and difficult to compute and analyze visually. It is significant of research and application of geological 3D model in the field of tectonics and geological resource exploration. An extendable geological 3D Information model built practicably includes data model and visualization model. Original data such as geological exploration is mostly discrete, which can be built static structure model based UML and be stored by spatial database of GIS. Continuous data of strata surface and body is produced from original data by vector lay constructing. In horizontal direction strata’ surface is built from GRID model by interpolating with cubic splines. In vertical direction strata’ section is built from TIN model by constraint algorithm Of Delaunay triangle and can stimulate the 3D body of strata. Popular OpenGL is applied to the geological 3D visualization model, which can represent three-dimensional original data, geological body, and 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 query information of stratum. The scene can be saved and restored, too. With component-based development, the system of geological 3D information model is established, which succeeds in applying to building 3D model and analyzing visually of geological exploration in city. The model can be reuse and extended in three levels, which are extending the layered feature of original data in static structure model, optimizing of arithmetic in computing mode, and taking full advantage of OpenGL in visualization model. The mode is worthy of spreading.