First Sentinel-1 detections of avalanche debris
Snow avalanches are natural hazards, occurring in snow covered mountain terrain worldwide. Present avalanche research and forecasting relies on complete avalanche activity records in a given area over an entire winter season, which cannot be provided with traditional, mainly field based methods. Rem...
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ftcopernicus:oai:publications.copernicus.org:tcd28925 2023-05-15T17:24:39+02:00 First Sentinel-1 detections of avalanche debris Malnes, E. Eckerstorfer, M. Vickers, H. 2018-09-26 application/pdf https://doi.org/10.5194/tcd-9-1943-2015 https://tc.copernicus.org/preprints/tc-2015-26/ eng eng doi:10.5194/tcd-9-1943-2015 https://tc.copernicus.org/preprints/tc-2015-26/ eISSN: 1994-0424 Text 2018 ftcopernicus https://doi.org/10.5194/tcd-9-1943-2015 2020-07-20T16:24:41Z Snow avalanches are natural hazards, occurring in snow covered mountain terrain worldwide. Present avalanche research and forecasting relies on complete avalanche activity records in a given area over an entire winter season, which cannot be provided with traditional, mainly field based methods. Remote sensing, using weather, and light independent SAR satellites has the potential of filling these data gaps, however, to date their use was limited by high acquisition costs, long repeat cycles, and small ground swath. Sentinel-1A (S1A), on the other hand, operational since October 2014 provides free-of-charge, 20 m spatial resolution, 250 km × 150 km ground swath images every 12 days. In this paper, we present for the first time, that it is possible to detect avalanche debris using S1A images. We successfully apply a change detection method that enhances avalanche debris zones, by comparing repeat pass images before and after the avalanche occurred. Due to the increase in backscatter from avalanche debris, manual detection is possible. With this first proof-of-concept, we show the detection of 489 avalanche debris zones in a S1A image from 6 January 2015, covering the counties Troms and parts of Nordland in Northern Norway. We validate our avalanche detection using very high resolution Radarsat-2 Ultrafine images, as well as extensive field reconnaissance. Our results give us confidence, that S1A detection of avalanches is a critical step towards operational use of SAR avalanche detection in avalanche forecasting. Text Nordland Nordland Northern Norway Nordland Troms Copernicus Publications: E-Journals Norway |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
Snow avalanches are natural hazards, occurring in snow covered mountain terrain worldwide. Present avalanche research and forecasting relies on complete avalanche activity records in a given area over an entire winter season, which cannot be provided with traditional, mainly field based methods. Remote sensing, using weather, and light independent SAR satellites has the potential of filling these data gaps, however, to date their use was limited by high acquisition costs, long repeat cycles, and small ground swath. Sentinel-1A (S1A), on the other hand, operational since October 2014 provides free-of-charge, 20 m spatial resolution, 250 km × 150 km ground swath images every 12 days. In this paper, we present for the first time, that it is possible to detect avalanche debris using S1A images. We successfully apply a change detection method that enhances avalanche debris zones, by comparing repeat pass images before and after the avalanche occurred. Due to the increase in backscatter from avalanche debris, manual detection is possible. With this first proof-of-concept, we show the detection of 489 avalanche debris zones in a S1A image from 6 January 2015, covering the counties Troms and parts of Nordland in Northern Norway. We validate our avalanche detection using very high resolution Radarsat-2 Ultrafine images, as well as extensive field reconnaissance. Our results give us confidence, that S1A detection of avalanches is a critical step towards operational use of SAR avalanche detection in avalanche forecasting. |
format |
Text |
author |
Malnes, E. Eckerstorfer, M. Vickers, H. |
spellingShingle |
Malnes, E. Eckerstorfer, M. Vickers, H. First Sentinel-1 detections of avalanche debris |
author_facet |
Malnes, E. Eckerstorfer, M. Vickers, H. |
author_sort |
Malnes, E. |
title |
First Sentinel-1 detections of avalanche debris |
title_short |
First Sentinel-1 detections of avalanche debris |
title_full |
First Sentinel-1 detections of avalanche debris |
title_fullStr |
First Sentinel-1 detections of avalanche debris |
title_full_unstemmed |
First Sentinel-1 detections of avalanche debris |
title_sort |
first sentinel-1 detections of avalanche debris |
publishDate |
2018 |
url |
https://doi.org/10.5194/tcd-9-1943-2015 https://tc.copernicus.org/preprints/tc-2015-26/ |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Nordland Nordland Northern Norway Nordland Troms |
genre_facet |
Nordland Nordland Northern Norway Nordland Troms |
op_source |
eISSN: 1994-0424 |
op_relation |
doi:10.5194/tcd-9-1943-2015 https://tc.copernicus.org/preprints/tc-2015-26/ |
op_doi |
https://doi.org/10.5194/tcd-9-1943-2015 |
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1766115773021945856 |