Detection of crevassed areas with minimum geometric information: Vernagtferner case study
Crevasses pose severe risks for mountaineers and field glaciologists. Smaller cracks between 0.5 and 2 m are still dangerous, but often not visible in medium resolution satellite imagery. If they are snow covered, they are completely undetectable by optical sensors. We set out to develop an approach...
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Cambridge University Press
2023
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Online Access: | https://doi.org/10.1017/jog.2023.12 https://doaj.org/article/a6520999c9274cfcbb26563177d969b6 |
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ftdoajarticles:oai:doaj.org/article:a6520999c9274cfcbb26563177d969b6 2023-11-12T04:19:55+01:00 Detection of crevassed areas with minimum geometric information: Vernagtferner case study Theresa Dobler Wilfried Hagg Christoph Mayer 2023-10-01T00:00:00Z https://doi.org/10.1017/jog.2023.12 https://doaj.org/article/a6520999c9274cfcbb26563177d969b6 EN eng Cambridge University Press https://www.cambridge.org/core/product/identifier/S0022143023000126/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2023.12 0022-1430 1727-5652 https://doaj.org/article/a6520999c9274cfcbb26563177d969b6 Journal of Glaciology, Vol 69, Pp 1214-1224 (2023) Applied glaciology crevasses glacier hazards Environmental sciences GE1-350 Meteorology. Climatology QC851-999 article 2023 ftdoajarticles https://doi.org/10.1017/jog.2023.12 2023-10-29T00:40:50Z Crevasses pose severe risks for mountaineers and field glaciologists. Smaller cracks between 0.5 and 2 m are still dangerous, but often not visible in medium resolution satellite imagery. If they are snow covered, they are completely undetectable by optical sensors. We set out to develop an approach to detect potentially crevassed areas by a minimum of geometric data, and to make the method generally applicable to glacier regions. On Vernagtferner, we compared a reference dataset of crevasses observed in high-resolution optical imagery with the curvature of the ice surface and the spatial gradients in driving stress. Both parameters can be derived from a digital surface model and a bedrock model, derived from ice thickness measurements. The correlation patterns show that crevasses preferably form in convex areas and in areas where the driving stress rapidly increases. This corresponds with the theory of crevasse formation. Although the method still misclassifies larger parts, the approach has the potential to define probable non-crevassed areas as well as to aid the planning of safe routes. Article in Journal/Newspaper Journal of Glaciology Directory of Open Access Journals: DOAJ Articles Journal of Glaciology 1 11 |
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Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Applied glaciology crevasses glacier hazards Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
spellingShingle |
Applied glaciology crevasses glacier hazards Environmental sciences GE1-350 Meteorology. Climatology QC851-999 Theresa Dobler Wilfried Hagg Christoph Mayer Detection of crevassed areas with minimum geometric information: Vernagtferner case study |
topic_facet |
Applied glaciology crevasses glacier hazards Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
description |
Crevasses pose severe risks for mountaineers and field glaciologists. Smaller cracks between 0.5 and 2 m are still dangerous, but often not visible in medium resolution satellite imagery. If they are snow covered, they are completely undetectable by optical sensors. We set out to develop an approach to detect potentially crevassed areas by a minimum of geometric data, and to make the method generally applicable to glacier regions. On Vernagtferner, we compared a reference dataset of crevasses observed in high-resolution optical imagery with the curvature of the ice surface and the spatial gradients in driving stress. Both parameters can be derived from a digital surface model and a bedrock model, derived from ice thickness measurements. The correlation patterns show that crevasses preferably form in convex areas and in areas where the driving stress rapidly increases. This corresponds with the theory of crevasse formation. Although the method still misclassifies larger parts, the approach has the potential to define probable non-crevassed areas as well as to aid the planning of safe routes. |
format |
Article in Journal/Newspaper |
author |
Theresa Dobler Wilfried Hagg Christoph Mayer |
author_facet |
Theresa Dobler Wilfried Hagg Christoph Mayer |
author_sort |
Theresa Dobler |
title |
Detection of crevassed areas with minimum geometric information: Vernagtferner case study |
title_short |
Detection of crevassed areas with minimum geometric information: Vernagtferner case study |
title_full |
Detection of crevassed areas with minimum geometric information: Vernagtferner case study |
title_fullStr |
Detection of crevassed areas with minimum geometric information: Vernagtferner case study |
title_full_unstemmed |
Detection of crevassed areas with minimum geometric information: Vernagtferner case study |
title_sort |
detection of crevassed areas with minimum geometric information: vernagtferner case study |
publisher |
Cambridge University Press |
publishDate |
2023 |
url |
https://doi.org/10.1017/jog.2023.12 https://doaj.org/article/a6520999c9274cfcbb26563177d969b6 |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_source |
Journal of Glaciology, Vol 69, Pp 1214-1224 (2023) |
op_relation |
https://www.cambridge.org/core/product/identifier/S0022143023000126/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2023.12 0022-1430 1727-5652 https://doaj.org/article/a6520999c9274cfcbb26563177d969b6 |
op_doi |
https://doi.org/10.1017/jog.2023.12 |
container_title |
Journal of Glaciology |
container_start_page |
1 |
op_container_end_page |
11 |
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1782336145758093312 |