Research And Implementation On Three Dimensional Terrain Visualization

The three dimensional terrain visualization is a new research hot spot which the recent years computer graphics and the geographic information system unified produces. Geological data material which gathers using the geographic information system, through the terrain modelling, the texture mapping, the illumination model hypothesis, the projection pattern choice as well as terrain roaming and so on, may realize has highly the third dimension three dimensional terrain dynamic demonstration.This article has absorbed the computer graphics, the modern mathematics, the survey study and so on the numerous domain massive advanced theory achievement foundation, has studied the terrain modelling elementary theory and the method, take the terrain modelling algorithm and the three dimensional three-dimensional visualization algorithm as the main theory, in system's elaboration three dimensional GIS the terrain three dimensional visualization theory, including digital elevation model terrain surface modeling technology, terrain three dimensional visualization elementary theory, three dimensional terrain dynamic display technology.Through the research of real geoscience successional variation process from the three dimensional terrain's manifestation and the modelling existence's subject matter, as develops the platform take VC++, uses OpenGL the drawing technique, has realized the three dimensional terrain fast modelling as well as the dynamic demonstration, established has enabled the river course boundary to have dynamic auto-adapted the searching algorithm, realized conformable display to river water pan-Hong's, enabled the user to be possible the multiple perspectives multi-side understanding terrain landform, provided one for the three dimensional terrain simulation and the flood evolution simulation to be possible the operational analysis virtual environment.