Mapping avalanches with satellites-Evaluation of performance and completeness
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...
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ftethz:oai:www.research-collection.ethz.ch:20.500.11850/473489 2023-12-31T10:23:38+01:00 Mapping avalanches with satellites-Evaluation of performance and completeness Hafner, Elisabeth D. Techel, Frank Leinss, Silvan id_orcid:0 000-0002-4467-5793 Bühler, Yves 2021-02-24 application/application/pdf https://hdl.handle.net/20.500.11850/473489 https://doi.org/10.3929/ethz-b-000473489 en eng Copernicus info:eu-repo/semantics/altIdentifier/doi/10.5194/tc-15-983-2021 info:eu-repo/semantics/altIdentifier/wos/000627571700003 http://hdl.handle.net/20.500.11850/473489 doi:10.3929/ethz-b-000473489 info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International The Cryosphere, 15 (2) info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2021 ftethz https://doi.org/20.500.11850/47348910.3929/ethz-b-00047348910.5194/tc-15-983-2021 2023-12-04T00:51:46Z 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 ... Article in Journal/Newspaper The Cryosphere ETH Zürich Research Collection |
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Open Polar |
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ETH Zürich Research Collection |
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ftethz |
language |
English |
description |
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 ... |
format |
Article in Journal/Newspaper |
author |
Hafner, Elisabeth D. Techel, Frank Leinss, Silvan id_orcid:0 000-0002-4467-5793 Bühler, Yves |
spellingShingle |
Hafner, Elisabeth D. Techel, Frank Leinss, Silvan id_orcid:0 000-0002-4467-5793 Bühler, Yves Mapping avalanches with satellites-Evaluation of performance and completeness |
author_facet |
Hafner, Elisabeth D. Techel, Frank Leinss, Silvan id_orcid:0 000-0002-4467-5793 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 |
publishDate |
2021 |
url |
https://hdl.handle.net/20.500.11850/473489 https://doi.org/10.3929/ethz-b-000473489 |
genre |
The Cryosphere |
genre_facet |
The Cryosphere |
op_source |
The Cryosphere, 15 (2) |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/tc-15-983-2021 info:eu-repo/semantics/altIdentifier/wos/000627571700003 http://hdl.handle.net/20.500.11850/473489 doi:10.3929/ethz-b-000473489 |
op_rights |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International |
op_doi |
https://doi.org/20.500.11850/47348910.3929/ethz-b-00047348910.5194/tc-15-983-2021 |
_version_ |
1786835391970541568 |