Conceptual design, data model and key techniques of “3D Assistant”
(1. Key Laboratory of Geo-Informatics, Chinese Academy of Surveying and Mapping, Beijing 100830, China;
2. School of Geo-Science and Surveying Engineering, China University of Mining and Technology,
Beijing 100083, China;
3. School of Geomatics, Liaoning Technical University, Fuxin 123000, China)
2. School of Geo-Science and Surveying Engineering, China University of Mining and Technology,
Beijing 100083, China;
3. School of Geomatics, Liaoning Technical University, Fuxin 123000, China)
Abstract: Conceptual design, data model and key techniques of “Geo-engineer 3D assistant”, an underground 3D GIS oriented to geology and mine application, were discussed. In particular, the importance of high-order smoothing triangular pieces to surface’s fine expression in geological modeling was emphasized. The contour mode is the most favorite mode of the three modes about surface expression: DEM, TIN and contour. Topology in underground 3D modeling with CAGD was compared. From the view of boundary and coboundary, which is soul of IS 19107 (Geographic information spatial schema), 3D underground topology was re-examined.
Key words: 3D assistant; true 3D; GIS; fine expression of surface; contour mode; 3D topology