气候变化领域集成服务门户(CCPortal): Sensitivity of glacier volume change estimation to DEM void interpolation

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DOI	10.5194/tc-13-895-2019
	Sensitivity of glacier volume change estimation to DEM void interpolation
	McNabb R.; Nuth C.; Kääb A.; Girod L.
发表日期	2019
ISSN	19940416
EISSN	13
起始页码	895
结束页码	910
卷号	13 期号:3
英文摘要	Glacier mass balance has been estimated on individual glacier and regional scales using repeat digital elevation models (DEMs). DEMs often have gaps in coverage ("voids"), the properties of which depend on the nature of the sensor used and the surface being measured. The way that these voids are accounted for has a direct impact on the estimate of geodetic glacier mass balance, though a systematic comparison of different proposed methods has been heretofore lacking. In this study, we determine the impact and sensitivity of void interpolation methods on estimates of volume change. Using two spatially complete, high-resolution DEMs over southeast Alaska, USA, we artificially generate voids in one of the DEMs using correlation values derived from photogrammetric processing of Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) scenes. We then compare 11 different void interpolation methods on a glacier-by-glacier and regional basis. We find that a few methods introduce biases of up to 20% in the regional results, while other methods give results very close (1% difference) to the true, non-voided volume change estimates. By comparing results from a few of the best-performing methods, an estimate of the uncertainty introduced by interpolating voids can be obtained. Finally, by increasing the number of voids, we show that with these best-performing methods, reliable estimates of glacier-wide volume change can be obtained, even with sparse DEM coverage. © 2019 Author(s).
学科领域	abundance estimation; ASTER; digital elevation model; glacier mass balance; interpolation; satellite sensor; void; volume change; Alaska; United States
语种	英语
scopus关键词	abundance estimation; ASTER; digital elevation model; glacier mass balance; interpolation; satellite sensor; void; volume change; Alaska; United States
来源期刊	The Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/118910
作者单位	Department of Geosciences, University of Oslo, Postboks 1047, Blindern Oslo, 0316, Norway
推荐引用方式 GB/T 7714	McNabb R.,Nuth C.,Kääb A.,et al. Sensitivity of glacier volume change estimation to DEM void interpolation[J],2019,13(3).
APA	McNabb R.,Nuth C.,Kääb A.,&Girod L..(2019).Sensitivity of glacier volume change estimation to DEM void interpolation.The Cryosphere,13(3).
MLA	McNabb R.,et al."Sensitivity of glacier volume change estimation to DEM void interpolation".The Cryosphere 13.3(2019).