Key Technologies Research On View Data 3D Modeling And Real-time Rendering Of Complex Altiplano Aerodrome

The pilot skills which required by the altiplano aerodromes are much higher than by the other aerodromes due to the complex terrain environment and atrocious weather conditions of the western altiplano, moreover, flight simulator has been indispensable to pilot training. As the development of remote-sensing and virtual-reality technologies, higher scene fidelity is required by the simulator, meanwhile it brings the conflict between massive elevation/image data and limited hardware resources. However, the traditional methods of terrain visualization can't satisfy the real-time requirement of massive data processing according to large-scale high-resolution scene simulation.In this thesis, with the research background of civil aviation flight simulation and large-scale terrain visualization, a method of terrain pyramid modeling based on non-square layered-and-tiled quad-tree is proposed. It builds the large-scale multi-resolution terrain model by integrating MRLoD technique.Methods of geometry modeling of tiled terrain which based on TRN and TIN respectively is proposed for the terrain quad-tree pyramid model, and methods of avoiding gaps of multi-resolution tiles are also proposed corresponding to the geometry modeling method. The ultimately method of the thesis is based on TIN. Then a method of texture mapping based on multi-resolution texture quad-tree is proposed to cooperate with the geometry model. It further improves the speed of living terrain rendering.For real-time rendering, methods of visibility judgment, resolution computing and scheduling of tiles are proposed based on the terrain quad-tree pyramid model, and an algorithm of tile prediction is used to smooth the rendering effects. These methods effectively simplify the models within the scene while keeping their precision.Finally, based on the researches of technology theories above, the Prototype System of Scene Simulation of Altiplano Aerodrome is designed and implemented using OpenGL. The experimental results show the validity of methods of large-scale terrain modeling and real-time rendering which proposed by the thesis.