Abstract
Abstract In order to make full use of the topographic map with DWG format and construct 3D terrain model, a new 3D terrain model generation algorithm based on conversion technology is put forward. Firstly, by processing the topographic map with DWG format, we can get the standardized data which can be stored in spatial database. Secondly, the elevation points and the elevation data note text are matched automatically to generate the objects with 3D information. Thirdly, with discrete sampling technology, we can extract the 3D data points in the contour lines. Finally, with the VRML model, texture mapping, blending, the system based on OpenGL was accomplished. The effect of system can favorably meet the need of real time and realistic rending.
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