At first, we construct a stimulant digital elevation model by a certain resolution in gauss surface and calculate gauss curvature of each grid point, which is regarded as true value to terrain simplification index.

• 首先对数学曲面(高斯合成曲面)按一定分辨率建立模拟DEM,由高斯曲面函数的数学表达式解析得到“真实”反映格网点附近表面形状变化的“真值”,即高斯曲率;