Error Analysis of Elevation and Slope Derived from DEM in Northern Tibet Plateau

LIU Fei; FAN Jian-rong; GUO Fen-fen; ZHANG Huai-zhen

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Error Analysis of Elevation and Slope Derived from DEM in Northern Tibet Plateau

- Error Analysis of Elevation and Slope Derived from DEM in Northern Tibet Plateau
- Bulletin of Soiland Water Conservation Vol. 30, Issue 6, Pages: 148-151(2011)
- 作者机构：
  
  1. 中国科学院水利部成都山地灾害与环境研究所,四川,成都,610041
  2. 中国科学院研究生院,北京,100049
- 作者简介：
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- Published：2011
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LIU Fei, FAN Jian-rong, GUO Fen-fen, et al. Error Analysis of Elevation and Slope Derived from DEM in Northern Tibet Plateau[J]. Bulletin of Soiland Water Conservation, 2011, 30(6): 148-151.
DOI：

LIU Fei, FAN Jian-rong, GUO Fen-fen, et al. Error Analysis of Elevation and Slope Derived from DEM in Northern Tibet Plateau[J]. Bulletin of Soiland Water Conservation, 2011, 30(6): 148-151. DOI：

摘要

高程是数字高程模型(DEM)的基本信息

坡度是DEM进行地形分析的重要描述性因子之一。选取藏北高原区为研究区域

在实测GPS高程值和实测坡度数据的基础上

对SRTM与ASTER GDEM高程值和提取的坡度进行了误差分析。研究表明:(1)SRTM和ASTER GDEM在采集高程值时误差较小

二者与实测值之间的Pearson相关系数分别为0.975和0.994

中误差(RMSE)为57.381和31.106

精度比率(AR)为2.089和1.976

相对平均误差(R_ME)为1.1%和0.7%;(2)SRTM提取坡度的误差较大

而ASTER GDEM提取的坡度误差较小

二者与实测值之间的Pearson相关系数分别为0.878和0.946

中误差(RMSE)为4.014和2.395

精度比率(AR)为1.238和1.034

相对平均误差(R_ME)为21.5%和5.5%;(3)频率累计坡谱能直观地表现DEM提取坡度的误差大小。

Abstract

SRTM and ASTER GDEM are public DEMs(digital elevation models)

which are used widely in terrain analysis.Elevation is the base information for DEM

and slope is one of the most important DEM terrain representation factors.Based on the actual measurement data of elevation and slope

we measured the error of the DEM and slope using the methods of correlation analysis

accuracy analysis

slope spectrum analysis and regression analysis in the Northern Tibet Plateau.The results showed as follows:(1) There was some small errors in the elevation data derived from SRTM and GDEM.The Pearson correlation coefficient between elevation data and the actual measurement is 0.975 and 0.994

the root mean square error(RMSE) 57.381 and 31.106

the accuracy ratio(AR) 2.089 and 1.976

and the relative mean error(R_ME) 1.1% and 0.7%.(2) There is more error with the slope data derived from SRTM than from ASTER GDEM.Compared with the actual measurement

their Pearson correlation coefficient is 0.878 and 0.946

the root mean square error(RMSE) 4.014 and 2.395

the accuracy ratio(AR) 1.238 and 1.034

and the relative mean error(R_ME) 21.5% and 5.5%.(3) The slope spectrum is a new way in terrain analysis

and we found that the accumulative frequency slope spectrum can visually indicate errors in slope derived from DEM.

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