An inventory of Norway's glaciers and ice-marginal lakes from 2018–19 Sentinel-2 data
Abstract We used Sentinel-2 satellite imagery at 10 m resolution to map the extent of Norway's glaciers and ice-marginal lakes over 2018–19. We applied a standardized semi-automated band ratio method to derive glacier outlines and ice-marginal lakes. To optimise the results, we manually edited...
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Cambridge University Press (CUP)
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Online Access: | http://dx.doi.org/10.1017/jog.2022.20 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S002214302200020X |
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crcambridgeupr:10.1017/jog.2022.20 2024-09-30T14:35:25+00:00 An inventory of Norway's glaciers and ice-marginal lakes from 2018–19 Sentinel-2 data Andreassen, Liss M. Nagy, Teodor Kjøllmoen, Bjarne Leigh, Joshua R. 2022 http://dx.doi.org/10.1017/jog.2022.20 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S002214302200020X en eng Cambridge University Press (CUP) https://creativecommons.org/licenses/by/4.0/ Journal of Glaciology volume 68, issue 272, page 1085-1106 ISSN 0022-1430 1727-5652 journal-article 2022 crcambridgeupr https://doi.org/10.1017/jog.2022.20 2024-09-11T04:04:04Z Abstract We used Sentinel-2 satellite imagery at 10 m resolution to map the extent of Norway's glaciers and ice-marginal lakes over 2018–19. We applied a standardized semi-automated band ratio method to derive glacier outlines and ice-marginal lakes. To optimise the results, we manually edited the ice-lake interfaces, debris, snow and parts of the glaciers situated under shadow. We compared our Sentinel-2 derived outlines with very high-resolution aerial orthophotos and Pléiades satellite orthoimages. Glaciers larger than 0.3 km 2 have area differences within 7%, whereas values are larger for smaller glaciers. The orthophotos and orthoimages provide more details and a higher mapping accuracy for individual glaciers, but require manual digitisation, have smaller spatial and temporal coverage and can have adverse snow conditions. We found a total glacier area of 2328 ± 70 km 2 of which the ten largest glaciers accounted for 52%. The glacier area decreased 15% since the previous inventory (Landsat data from 1999 to 2006), the reduction being largest in northern Norway (22%) compared to southern Norway (10%). We detected more than 2000 previously undetected smaller glaciers and ice patches (covering 37 km 2 ) and 360 new ice-marginal lakes. Article in Journal/Newspaper glacier Journal of Glaciology Northern Norway Cambridge University Press Norway Journal of Glaciology 1 22 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
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English |
description |
Abstract We used Sentinel-2 satellite imagery at 10 m resolution to map the extent of Norway's glaciers and ice-marginal lakes over 2018–19. We applied a standardized semi-automated band ratio method to derive glacier outlines and ice-marginal lakes. To optimise the results, we manually edited the ice-lake interfaces, debris, snow and parts of the glaciers situated under shadow. We compared our Sentinel-2 derived outlines with very high-resolution aerial orthophotos and Pléiades satellite orthoimages. Glaciers larger than 0.3 km 2 have area differences within 7%, whereas values are larger for smaller glaciers. The orthophotos and orthoimages provide more details and a higher mapping accuracy for individual glaciers, but require manual digitisation, have smaller spatial and temporal coverage and can have adverse snow conditions. We found a total glacier area of 2328 ± 70 km 2 of which the ten largest glaciers accounted for 52%. The glacier area decreased 15% since the previous inventory (Landsat data from 1999 to 2006), the reduction being largest in northern Norway (22%) compared to southern Norway (10%). We detected more than 2000 previously undetected smaller glaciers and ice patches (covering 37 km 2 ) and 360 new ice-marginal lakes. |
format |
Article in Journal/Newspaper |
author |
Andreassen, Liss M. Nagy, Teodor Kjøllmoen, Bjarne Leigh, Joshua R. |
spellingShingle |
Andreassen, Liss M. Nagy, Teodor Kjøllmoen, Bjarne Leigh, Joshua R. An inventory of Norway's glaciers and ice-marginal lakes from 2018–19 Sentinel-2 data |
author_facet |
Andreassen, Liss M. Nagy, Teodor Kjøllmoen, Bjarne Leigh, Joshua R. |
author_sort |
Andreassen, Liss M. |
title |
An inventory of Norway's glaciers and ice-marginal lakes from 2018–19 Sentinel-2 data |
title_short |
An inventory of Norway's glaciers and ice-marginal lakes from 2018–19 Sentinel-2 data |
title_full |
An inventory of Norway's glaciers and ice-marginal lakes from 2018–19 Sentinel-2 data |
title_fullStr |
An inventory of Norway's glaciers and ice-marginal lakes from 2018–19 Sentinel-2 data |
title_full_unstemmed |
An inventory of Norway's glaciers and ice-marginal lakes from 2018–19 Sentinel-2 data |
title_sort |
inventory of norway's glaciers and ice-marginal lakes from 2018–19 sentinel-2 data |
publisher |
Cambridge University Press (CUP) |
publishDate |
2022 |
url |
http://dx.doi.org/10.1017/jog.2022.20 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S002214302200020X |
geographic |
Norway |
geographic_facet |
Norway |
genre |
glacier Journal of Glaciology Northern Norway |
genre_facet |
glacier Journal of Glaciology Northern Norway |
op_source |
Journal of Glaciology volume 68, issue 272, page 1085-1106 ISSN 0022-1430 1727-5652 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1017/jog.2022.20 |
container_title |
Journal of Glaciology |
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1 |
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22 |
_version_ |
1811638698239852544 |