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OALib Journal期刊
ISSN: 2333-9721
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DEM提取黄土高原地面坡度的不确定性
DOI: 10.11821/xb200306004, PP. 824-830
Keywords: 黄土高原,DEM,坡度,分辨率,不确定性
Abstract:
选择陕北黄土高原6个典型地貌类型区为试验样区，采用野外实测及高精度的11万比例尺DEM为基准数据，研究栅格分辨率及地形粗糙度对DEM所提取地面平均坡度精度的影响。结果显示，对于11万比例尺DEM，5m是保证该地区地形描述精度的理想分辨率尺度；多要素逐步回归模拟的方法进一步揭示了DEM所提取的地面平均坡度误差E与栅格分辨率X以及地形起伏的代表性因子—沟壑密度S之间存在的量化关系为E=(0.0015S2+0.031S-0.0325)X-0.0045S2-0.155S+0.1625，该结果也为确定适用的DEM分辨率提供了理论依据。
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