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青藏高原地区3种全球DEM精度对不同地形因子的响应
高志远1,2, 谢元礼1,2,3, 王宁练1,2,3, 蒋广鑫1, 周鹏1
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
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。
关键词:  ICESAT/GLAS  地形因子  DEM精度评价  青藏高原
DOI:10.13961/j.cnki.stbctb.2019.02.030
分类号:P208
基金项目:中国科学院“一带一路”科技合作专项“中国科学院国际合作局对外合作重点项目”(131C11KYSB20160061);中国科学院A类战略性先导科技专项“地球大数据科学工程”(XDA19070302)
Response of Three Global DEM Data Accuracy to Different Terrain Factors in Qinghai-Tibet Plateau
Gao Zhiyuan1,2, Xie Yuanli1,2,3, Wang Ninglian1,2,3, Jiang Guangxin1, Zhou Peng1
1.College of Urban and Environmental Sciences, Northwest University, Xi'an, Shaanxi 710127, China;2.Shaanxi Key Laboratory of Earth Surface System and Environmental Carrying Capacity, Northwest University, Xi'an, Shaanxi 710127, China;3.Institute of Earth Surface System and Hazards, Northwest University, Xi'an, Shaanxi 710127, China
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.
Key words:  ICESAT/GLAS  terrain factors  DEM accuracy evaluation  Qinghai-Tibet Plateau