关键词: 格网地形, 三维地形, 采样点数据, 区域特征插值

Abstract: To improve the rendering realistic effect of the three-dimensional terrain in virtual scene, a new three-dimensional terrain modeling approach was put forward, which was based on reginal distance weighting method. In this method, the sample data was classified by the elevation value and the mapping relationship between classified data and the number of interpolation points constructed. Then, distance weighted factor was obtained by combining the Diamond-square subdivision method to compute the interpolation point coordinate data. At last, to ensure the smoothness and continuity of interpolation points, distance weighting calculation equations was established with the judgment of the interpolation point regional features. Compared with the traditional terrain modeling method, theoretical analysis and simulation results show that this method can improve the realistic effect of the 3D terrain and reduce the terrain rendering time by 20 percent.

Key words: Digital Elevation Model (DEM), 3D terrain, sample point data, regional feature interpilation