A Rapid Updating Method of Local High-precision Terrain Data in 3d Terrain Scene

In many applications, three dimensional terrain scene has to be updated in local area with high-precision data, in order to build a local high-precision scene. Aim at the dynamic updating of local terrain data, this paper puts forward a GPU tessellation-based "Mosaic" method of local high precision terrain. Through the interpolation and subdivision on the terrain grid within the updating area in GPU to increase the number of triangles, as a result, the geometrical accuracy of the local terrain model is improved without increasing the bandwidth of the memory and video memory. The results show that the precision of updating area meet the demand and this algorithm’s execution efficiency is obviously better than the common method.