DEM提取地面平均坡度误差的量化模拟

A Math-simulation on Accuracy of Gradient Extracted from DEMs

研究选取陕北黄土丘陵沟壑区、黄土梁峁丘陵区、黄土低丘区以及黄土破碎塬区 4种地貌地区作为试验样区 ,采用高精度 1∶ 1万比例尺 5 m分辨率的 DEM为基准数据 ,应用比较分析、回归分析和相关分析等方法研究黄土高原不同分辨率 DEM提取地面平均坡度精度的量化估算方法 ,所得到的精度计算数模表达式经验证具有很好的应用前景 。

At present, the environment reconstruction project in the loess plateau area needs the support of the accurate slope gradient. The slope data are mainly detained from the digital elevation model. Four different test areas are chosen to learn the estimation way of the slope gradient from DEM and set up a slope accuracy simulation math model by assuming 1∶10 000 scale, 5 m resolution DEM as the basis, and applying relation analysis, regression analysis. This model was testified to be available in application, which also present the important way to set up the general model of the national scale.