Some Issues on Ture Three-Dimensional Geosciences Modeling

Based on scientific visualization, 3D GIS, 3D geosciences modeling (3DGM) and its applications in geology, mining and civil engineering, the facial model, volumetric model and mixed model for spatial modeling in geosciences domain are systematically analyzed. The existing fundamental problems of 3DGM technologies are presented. The ture 3D modeling principles, methods and features of the generalized tri-prism (GTP) model are introduced. The GTP model is directly based on sampling data with essential open and topological relationship embodied properties. The key issues and core problems existing in GTP-based ture 3DGM are suggested and discussed. It concludes that the massive geosciences spatial data organization is the heart of 3DGM system. The developing of ture 3DGM system should employ the knowledge of scientific visualization and 3D GIS technology, and should also sufficiently utilize the graphic functions of Visual C++ and OpenGL, so as to implement the visualized geoscience manipulation with a flexible,convenient user, friendly and interactive operational environment.