黄河流域12.5米分辨率地形因子数据集

A dataset of topographic factors with 12.5 m spatial resolution in the Yellow River Basin

黄河流域地形复杂、气候差异大,是我国水土保持及生态保护的重点地区,地形因子的变化对黄河流域水土流失防治及植被恢复具有重要的意义。本研究基于ALOS 12.5 m DEM数据,通过预处理、分幅、投影、地形指标计算等,获得了黄河流域坡度、坡向、综合曲率、平面曲率、剖面曲率、坡向变率、坡度变率、地形起伏度、地表粗糙度、地表切割深度和高程变异系数11项地形因子数据。经GLA14测高数据验证,ALOS 12.5 m DEM数据具有较高的绝对垂直精度,且它对地形的表达能力远高于GDEM 30 m和STRM 90 m分辨率的DEM数据。本数据集可为黄河流域地区植被恢复、土壤侵蚀定量评价及陆地水文分析等科学研究提供数据支撑。

The Yellow River Basin is a key area of soil and water conservation and ecological protection in China,due to its complex topography and great variation in climate.The study on changes of topographical factors is of great significance for the prevention and control of soil and water loss as well as vegetation restoration in this area.This dataset consists of 11 topographic factors,namely slope gradient,slope aspect,comprehensive curvature,plane curvature,sectional curvature,aspect variability,slope variability,topographic relief,surface roughness,surface cutting depth and the coefficient of variation of elevation.The data were sourced from ALOS DEMs with a resolution of 12.5 m,which were then processed through four steps:preprocessing,framing,projection and topographic index calculation.Verified by GLA14 altimetry data,the ALOS 12.5 m DEM data,with a high absolute vertical accuracy,are much better in expressing terrain characteristics than data of GDEM with 30 m resolution and STRM DEM data with 90 m resolution.This dataset can provide data support for scientific research in the Yellow River Basin,such as vegetation restoration,quantitative evaluation of soil erosion,and land hydrological analysis.