Mapping avalanches with satellites – evaluation of performance and completeness
The 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 a...
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Copernicus Publications
2021
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00055713 2024-09-15T18:39:00+00:00 Mapping avalanches with satellites – evaluation of performance and completeness Hafner, Elisabeth D. Techel, Frank Leinss, Silvan Bühler, Yves 2021-02 electronic https://doi.org/10.5194/tc-15-983-2021 https://noa.gwlb.de/receive/cop_mods_00055713 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00055364/tc-15-983-2021.pdf https://tc.copernicus.org/articles/15/983/2021/tc-15-983-2021.pdf eng eng Copernicus Publications The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-15-983-2021 https://noa.gwlb.de/receive/cop_mods_00055713 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00055364/tc-15-983-2021.pdf https://tc.copernicus.org/articles/15/983/2021/tc-15-983-2021.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2021 ftnonlinearchiv https://doi.org/10.5194/tc-15-983-2021 2024-06-26T04:41:37Z The 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. In 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 km2 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. We statistically confirm the high potential of SPOT for comprehensive avalanche mapping for selected periods (POD = 0.74, PPV = 0.88) as well as the reliability of Sentinel-1 (POD = 0.27, PPV = 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 = 0.06, PPV = 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. Article in Journal/Newspaper The Cryosphere Niedersächsisches Online-Archiv NOA The Cryosphere 15 2 983 1004 |
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Niedersächsisches Online-Archiv NOA |
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English |
topic |
article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Hafner, Elisabeth D. Techel, Frank Leinss, Silvan Bühler, Yves Mapping avalanches with satellites – evaluation of performance and completeness |
topic_facet |
article Verlagsveröffentlichung |
description |
The 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. In 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 km2 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. We statistically confirm the high potential of SPOT for comprehensive avalanche mapping for selected periods (POD = 0.74, PPV = 0.88) as well as the reliability of Sentinel-1 (POD = 0.27, PPV = 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 = 0.06, PPV = 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. |
format |
Article in Journal/Newspaper |
author |
Hafner, Elisabeth D. Techel, Frank Leinss, Silvan Bühler, Yves |
author_facet |
Hafner, Elisabeth D. Techel, Frank Leinss, Silvan Bühler, Yves |
author_sort |
Hafner, Elisabeth D. |
title |
Mapping avalanches with satellites – evaluation of performance and completeness |
title_short |
Mapping avalanches with satellites – evaluation of performance and completeness |
title_full |
Mapping avalanches with satellites – evaluation of performance and completeness |
title_fullStr |
Mapping avalanches with satellites – evaluation of performance and completeness |
title_full_unstemmed |
Mapping avalanches with satellites – evaluation of performance and completeness |
title_sort |
mapping avalanches with satellites – evaluation of performance and completeness |
publisher |
Copernicus Publications |
publishDate |
2021 |
url |
https://doi.org/10.5194/tc-15-983-2021 https://noa.gwlb.de/receive/cop_mods_00055713 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00055364/tc-15-983-2021.pdf https://tc.copernicus.org/articles/15/983/2021/tc-15-983-2021.pdf |
genre |
The Cryosphere |
genre_facet |
The Cryosphere |
op_relation |
The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-15-983-2021 https://noa.gwlb.de/receive/cop_mods_00055713 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00055364/tc-15-983-2021.pdf https://tc.copernicus.org/articles/15/983/2021/tc-15-983-2021.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/tc-15-983-2021 |
container_title |
The Cryosphere |
container_volume |
15 |
container_issue |
2 |
container_start_page |
983 |
op_container_end_page |
1004 |
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1810483390229512192 |