The statistical fractal features of the original coarse terrain data set were determined through linear regression, based on which a denser terrain can be derived by means of bilinear interpolation.

• 首先通过线性回归得到原始稀疏三维地表数据的分形统计特性，再以此特性??基础采用双线性插值的思想来构造更??稠密的自然地貌。