Extracting and Analyzing Slope and Slope Length Based on ASTER GDEM and SRTM Elevation Datasets

YANG Qin-ke; GUO Lan-qin; WANG Chun-mei

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Extracting and Analyzing Slope and Slope Length Based on ASTER GDEM and SRTM Elevation Datasets

- Extracting and Analyzing Slope and Slope Length Based on ASTER GDEM and SRTM Elevation Datasets
- Bulletin of Soiland Water Conservation Vol. 31, Issue 6, Pages: 142-146(2012)
- 作者机构：
  
  1. 西北大学城市与环境学院
  2. 陕西测绘地理信息局
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2012
- 稿件说明：
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YANG Qin-ke, GUO Lan-qin, WANG Chun-mei. Extracting and Analyzing Slope and Slope Length Based on ASTER GDEM and SRTM Elevation Datasets[J]. Bulletin of Soiland Water Conservation, 2012, 31(6): 142-146.
DOI：

YANG Qin-ke, GUO Lan-qin, WANG Chun-mei. Extracting and Analyzing Slope and Slope Length Based on ASTER GDEM and SRTM Elevation Datasets[J]. Bulletin of Soiland Water Conservation, 2012, 31(6): 142-146. DOI：

摘要

为了使SRTM和ASTER高程数据得到科学利用

选择东北漫岗丘陵区和黄土丘陵区

基于网络下载的SRTM和ASTER高程数据

利用数字地形分析的标准方法进行了数据处理。提取了坡度和坡长两个地形指标并与Hc-DEM(水文地貌关系正确的数字高程模型)及其提取的地形参数进行了对比

结果表明:(1)无论是高程、坡度还是坡长

均是Hc-DEM系列的数据表现最好

SRTM次之

ASTER表现较差;(2)在地形平坦地区

ASTER表面因明显的空值和洼地

使高程及其基础上提取的地形参数不具实用价值

但在地形比较陡的地区则可用;(3)基于SRTM和Hc-DEM提取的两组坡度和坡长具有相同的格局

但基于SRTM的坡度有衰减

坡长有扩展

实际应用前需进行尺度变换。

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.

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David Jupp

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LIANG Wei

Related Institution

Pivot Laboratory of Geographical Science in Jiangsu Province, Nanjing Normal University

西北大学城市与资源学系

Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling

Institute of Soil and Water Conservation, Northwest A & F University, Yangling

CSIRO Division of Marine and Atmospheric Research, GPO Box 3023

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