南方复合地貌区DEM内插算法的对比研究

数字高程模型是数字地形分析的重要数据基础，在土壤、水文、地貌、生态环境、地质灾害、农业等领域均有广泛应用。插值生成的DEM精度与插值算法本身特性、插值区域地貌类型都密切相关，研究插值算法对不同地貌类型的拟合精度差异，对提高DEM插值精度具有重要意义。以平原丘陵兼有、水网密集分布的南方复合地貌区为研究区，对ANUDEM，IDW，Kriging，Spline，NNI，TIN六种插值算法生成的DEM分别从总体、丘陵岗、平原3方面进行误差评价，结果表明:在丘陵岗地区，ANUDEM精度最高，对地形因子拟合程度最为准确；在平原地区，ANUDEM，TIN精度较高，能准确刻画水网等细节信息；总体而言，ANUDEM插值生成的DEM更能够精确地模拟南方复合地貌区的真实地形。

Comparative Study of Different DEM Interpolation Algorithms in the Southern Complex Geomorphologic Zone

Digital elevation model (DEM) is the basic data of digital terrain analysis and plays the key role in the soil sciences, hydrology, geomorphology, environmental science, geologic hazard, agriculture and so on. DEM accuracy is closely related to the characteristics of interpolation algorithms and types of landform, therefore, research on the fitting precision with interpolation methods on different landforms is important for the improvement of the DEM interpolation accuracy. Based on six interpolation methods including ANUDEM, IDW, Kriging, Spline, NNI and TIN, we chose southern complex geomorphologic zone as study area to contrast the accuracy of the interpolation surface and reticulation water network. The results showed that DEM interpolated by ANUDEM was much more precise than the others and reflected the terrain factors correctly in the hilly areas. Both ANUDEM and TIN performed well and could extract water network information in the plains. This study contributes to the obtaining of high-accurate DEM in southern complex geomorphologic zones.