不同比例尺DEM提取地面坡度的精度研究——以在黄土丘陵沟壑区的试验为例

以陕北绥德县韭园沟流域为试验样区 ,采用高精度 1∶ 1万 DEM所提取的坡度为准值 ,应用多层面复合分析和比较分析的方法 ,研究该地区 1∶ 5万 DEM提取地面坡度的误差特征与纠正方法。试验结果显示 ,所获得的不同空间尺度下 DEM所提取坡度值的转换图谱 ,可对 1∶ 5万 DEM计算的地面坡度统计值进行有效修正。该成果对于 DEM数据在水土保持领域若干应用标准的制定 ,提供了重要的理论依据与技术路线

Taking Jiuyuan watershed in Suide county of northern Shaanxi province as a test area, applying overlay and comparative laws as a basic research methodology and 1∶10 000 DEM as a criterion, a research on the errors simulation and the rectify method in deriving slope gradient from 1∶50 000 scale DEMs was made. A gradient correction down scaling model obtained can effectively rectify the slope statistical values in the hill and gully area of the loess plateau, which is of great significance in enacting relate...