分形地貌的分维模型能够充分反映地形的统计纹理特征,利用分形内插能从低分辨率的卫星或航空照片高程数据获取高分辨率的高程数据,达到较理想的建模效果.而分形模型中无标度区的确定直接影响到分形特征参数的求解和DEM建模质量的好坏,常用方法是采用人机交互试验来选取无标度区,缺乏客观标准.本文提出一种自动确定无标度区的方法,实验结果表明,该方法在DEM自动建模过程中是简洁、有效的.

The terrain model basedon fractal character can sufficiently represent the statistical texture features of theterrain. Better model and higher resolution DEM (Digital Elevation Model) data can beobtained from the lower resolution data by using fractal interpolation. The determinationof fractal scaleless range is very important for computing the fractal characteristicparameters and modeling the digital elevation. The traditional method for determining thefractal scaleless range usually adopts the mutual test between people and compute.However, this method tends to be too subjective. Hence, we offer an auto-determiningmethod, which has been proved to be concise, effective and efficient by experimental results.