水土保持通报2012，Vol.32Issue(6)：142-146,5.
基于ASTRE和SRTM高程数据的坡度和坡长提取与分析
Extracting and Analyzing Slope and Slope Length Based on ASTER GDEM and SRTM Elevation Datasets
摘要
Abstract
In order to establish rational use of ASTER GDEM and SRTM elevation datasets,the slope and slope length have been extracted from the datasets that were downloaded from the website and have been preprocessed.Furthermore,the extracted features were compared with Hc-DEM derived variables.The results showed that:(1) the Hc-DEM derived features were much better than the SRTM and ASTER GDEM derived in terms of all the topographic variables including elevation,slope,and slope length.(2) the variables extracted from ASTER GDEM were unrealistic for the areas with gentle slope,owing to the abnormally void values and irregular sinks,but in steepy area it is useful;(3) the topographic variables extracted from SRTM and Hc-DEM showed similar patterns,while the SRTM based variables featured reduced slopes and extended slope length,suggesting down-scaling may be required if it is applied in hydrological or erosional modelling.关键词
SRTM/ASTER/GDEM/坡度/坡长/Hc-DEMKey words
SRTM/ASTER GDEM/slope/slope length/Hc-DEM分类
农业科技引用本文复制引用
杨勤科,郭兰勤,王春梅..基于ASTRE和SRTM高程数据的坡度和坡长提取与分析[J].水土保持通报,2012,32(6):142-146,5.基金项目
国家自然科学基金项目“中低分辨率坡度变换方法研究”（40971173）,“流域分布式坡长研究” （）
水利部公益性行业专项“基于GIS的黄土丘陵区年侵蚀产沙经验模型研究” （）
