气候变化领域集成服务门户(CCPortal): Mapping avalanches with satellites-Evaluation of performance and completeness

CCPortal

DOI	10.5194/tc-15-983-2021
	Mapping avalanches with satellites-Evaluation of performance and completeness
	Hafner E.D.; Techel F.; Leinss S.; Bühler Y.
发表日期	2021
ISSN	19940416
起始页码	983
结束页码	1004
卷号	15 期号:2
英文摘要	pThe spatial distribution and size of avalanches are essential parameters for avalanche warning, avalanche documentation, mitigation measure design and hazard zonation. Despite its importance, this information is incomplete today and only available for limited areas and limited time periods. Manual avalanche mapping from satellite imagery has recently been applied to reduce this gap achieving promising results. However, their reliability and completeness have not yet been verified satisfactorily./p pIn our study we attempt a full validation of the completeness of visually detected and mapped avalanches from optical SPOT 6, Sentinel-2 and radar Sentinel-1 imagery. We examine manually mapped avalanches from two avalanche periods in 2018 and 2019 for an area of approximately 180 kmspan classCombining double low lineinline-formula2 around Davos, Switzerland, relying on ground-and helicopter-based photographs as ground truth. For the quality assessment, we investigate the probability of detection (POD) and the positive predictive value (PPV). Additionally, we relate our results to conditions which potentially influence avalanche detection in the satellite imagery./p pWe statistically confirm the high potential of SPOT for comprehensive avalanche mapping for selected periods (POD span classCombining double low lineinline-formulaCombining double low line 0.74, PPV span classCombining double low lineinline-formulaCombining double low line 0.88) as well as the reliability of Sentinel-1 (POD span classCombining double low lineinline-formulaCombining double low line 0.27, PPV span classCombining double low lineinline-formulaCombining double low line 0.87) for which the POD is reduced because mainly larger avalanches are mapped. Furthermore, we found that Sentinel-2 is unsuitable for the mapping of most avalanches due to its spatial resolution (POD span classCombining double low lineinline-formulaCombining double low line 0.06, PPV span classCombining double low lineinline-formulaCombining double low line 0.81). Because we could apply the same reference avalanche events for all three satellite mappings, our validation results are robust and comparable. We demonstrate that satellite-based avalanche mapping has the potential to fill the existing avalanche documentation gap over large areas, making alpine regions safer. © 2021 American Society of Mechanical Engineers (ASME). All rights reserved.
英文关键词	avalanche; digital mapping; prediction; radar altimetry; satellite altimetry; satellite imagery; spatial resolution; SPOT; warning system; Davos; Graubunden; Switzerland; Switzerland; Satellites
语种	英语
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202323
作者单位	Wsl Institute for Snow and Avalanche Research Slf, Davos Dorf, 7260, Switzerland; Institute of Environmental Engineering, Eth Zurich, Zurich, Switzerland; Department of Geography, University of Zurich, Zurich, Switzerland
推荐引用方式 GB/T 7714	Hafner E.D.,Techel F.,Leinss S.,et al. Mapping avalanches with satellites-Evaluation of performance and completeness[J],2021,15(2).
APA	Hafner E.D.,Techel F.,Leinss S.,&Bühler Y..(2021).Mapping avalanches with satellites-Evaluation of performance and completeness.Cryosphere,15(2).
MLA	Hafner E.D.,et al."Mapping avalanches with satellites-Evaluation of performance and completeness".Cryosphere 15.2(2021).