Research on Terrain Visualization Based on LOD Dynamic

Aiming at the problem of the effect of changes of large scale terrain rendering on the frame rate, this paper presented a data dynamic scheduling method based on quaternary tree LOD model, and using the node traversal of quaternary tree with the GPU parallel acceleration node, Increasing the motion vector, the observation vector and the fluctuation degree of the ground as the judging factors to achieve fast rendering of large-scale terrain, applying the rule that the layers of the adjacent terrain being not more than one, to solve the crack problem that often appears in the rendering scene, to realize the function of the real-time dynamic 3D visualization of large-scale terrain scene of 3D GIS. The experimental results show that, the method accelerating terrain loading through coordination of CPU and GPU, making the process of terrain rendering have good real-time and stable frame rate.