Response of Three Global DEM Data Accuracy to Different Terrain Factors in Qinghai-Tibet Plateau

Gao Zhiyuan; Xie Yuanli; Wang Ninglian; Jiang Guangxin; Zhou Peng

doi:10.13961/j.cnki.stbctb.2019.02.030

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Response of Three Global DEM Data Accuracy to Different Terrain Factors in Qinghai-Tibet Plateau

- Response of Three Global DEM Data Accuracy to Different Terrain Factors in Qinghai-Tibet Plateau
- Bulletin of Soiland Water Conservation Vol. 39, Issue 2, Pages: 184-191(2019)
- 作者机构：
  
  1. 西北大学城市与环境学院,陕西,西安,710127
  2. 陕西省地表系统与环境承载力重点实验室,陕西,西安,710127
  3. 西北大学地表系统与灾害研究院,陕西,西安,710127
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2019.02.030
  CLC： P208
- Published：2019
- 稿件说明：
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Gao Zhiyuan, Xie Yuanli, Wang Ninglian, et al. Response of Three Global DEM Data Accuracy to Different Terrain Factors in Qinghai-Tibet Plateau[J]. Bulletin of Soiland Water Conservation, 2019, 39(2): 184-191.
DOI：

Gao Zhiyuan, Xie Yuanli, Wang Ninglian, et al. Response of Three Global DEM Data Accuracy to Different Terrain Factors in Qinghai-Tibet Plateau[J]. Bulletin of Soiland Water Conservation, 2019, 39(2): 184-191. DOI： 10.13961/j.cnki.stbctb.2019.02.030.

摘要

[目的]探究青藏高原地区3种全球DEM精度对不同地形因子的响应，以便对全球DEM在各领域应用研究提供支撑。[方法]以青藏高原地区作为研究区，以ICESAT/GLAS的GLAH14高程数据作为高程参考数据，研究SRTM DEM，ASTER GDEM和HydroSHEDS DEM的精度对坡度、坡向以及地形粗糙度等地形因子的响应规律。[结果]总体上，SRTM DEM精度最高，HydroSHEDS DEM精度最低。不同地形因子对3种DEM精度均有不同影响。DEM误差随着坡向分布呈不同的态势。其中SRTM DEM正负测量偏离值点分别集中在南坡向和西北坡方向；ASTER GDEM正负测量偏离值点分别集中西北坡向和东南坡向；HydroSHEDS DEM正负测量偏离值点分别集中在东坡向和西南坡向。3种DEM精度与地形粗糙度均呈现较为明显的二次多项式关系。[结论]在青藏高原地区，3种DEM精度均与地形要素有着不同程度相关性，SRTM DEM精度最优且受地形要素影响程度小，HydroSHEDS DEM精度最差，受到地形要素的影响程度最大。

Abstract

[Objective] This study investigated the response of three global DEM data's accuracy to different terrain factors in the Qinghai-Tibet Plateau region in order to provide support for application and research of global DEM in various fields.[Methods] This study takes GLAH14 DEM data of ICESat/GLAS as referential data to explore the responses of accuracies of SRTM DEM

ASTER GDEM and HydroSHEDS DEM to terrain factors

e.g.

slope

aspect

and terrain roughness.[Results] In general

the accuracy of STRM DEM was the highest

while that of HydroSHEDS DEM was the lowest. Different terrain factors had different effects on three DEM accuracy. Three DEM errors present several trends because of aspect distribution. Specifically

positive and negative measurement deviation values in the SRTM DEM located in southern and northwestern aspects

ASTER GDEM in northwestern and southeastern aspects

and HydroSHEDS DEM in eastern and southwestern aspects. There was obvious quadratic polynomial relationship between DEM accuracy and terrain roughness expressed as fractal dimension D.[Conclusion] In the Qinghai-Tibet Plateau region

there have different levels of correlation between DEM accuracy and terrain factors

where SRTM DEM accuracy is the highest with slight influence from terrain factors

on the contrary HydroSHEDS DEM accuracy is the lowest with intense influence from terrain factors.

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