Research On Fast Reconstruction Of Three-Dimensional Terrain Model And Visualization Method With Contour Line

The three-dimentional visualization study of terrain has aroused great interests in recent years, which has been widely applied in the fields of the three-dimentional games, the Geographical Information System and the flight simulations. This paper covers four key points in the 3D visualization study of terrain, including the technology of image pretreatment with contour lines, the approaches of establishing three-dimentional terrain models, the real-time reflection of geographical data and the fast display of the terrain. The details are as follows:Introduction of technologies on the establishment and demonstration of 3-D terrain models with contour lines and some background information.Developing a deterministic approach to get the vector contour lines effectively with the pretreatment of the contour data.Establishing 3-D terrain models with vector contour lines and elevation terrain models with the help of the determination of space corresponding relations between contour lines, tile operation and branch operation.Explanation of real-time reflection of terrain models, including three algorithms in LOD technology, compared with Quadtree algorithm, ROAM algorithm and the algorithm based on the intermediate belt, to show the advantages and disadvantages of the different situations of the terrains, so as to find out the right algorithm, the Quadtree algorithm.Developing and implementing the fast demonstration on the VC platform with three-dimentional visualization techniques, such as VRML and OpenGL, providing a persuasive argument for the research.