A new digital elevation model of Antarctica derived from CryoSat-2 altimetry
We present a new digital elevation model (DEM) of the Antarctic ice sheet and ice shelves based on 2.5 × 108 observations recorded by the CryoSat-2 satellite radar altimeter between July 2010 and July 2016. The DEM is formed from spatio-temporal fits to elevation measurements accumulated within 1, 2...
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ftucl:oai:eprints.ucl.ac.uk.OAI2:10076684 2023-12-24T10:11:31+01:00 A new digital elevation model of Antarctica derived from CryoSat-2 altimetry Slater, T Shepherd, A Mcmillan, M Muir, A Gilbert, L Hogg, AE Konrad, H Parrinello, T 2018-05-02 text https://discovery.ucl.ac.uk/id/eprint/10076684/1/tc-12-1551-2018.pdf https://discovery.ucl.ac.uk/id/eprint/10076684/ eng eng https://discovery.ucl.ac.uk/id/eprint/10076684/1/tc-12-1551-2018.pdf https://discovery.ucl.ac.uk/id/eprint/10076684/ open Cryosphere , 12 (4) pp. 1551-1562. (2018) Article 2018 ftucl 2023-11-27T13:07:36Z We present a new digital elevation model (DEM) of the Antarctic ice sheet and ice shelves based on 2.5 × 108 observations recorded by the CryoSat-2 satellite radar altimeter between July 2010 and July 2016. The DEM is formed from spatio-temporal fits to elevation measurements accumulated within 1, 2, and 5 km grid cells, and is posted at the modal resolution of 1 km. Altogether, 94 % of the grounded ice sheet and 98 % of the floating ice shelves are observed, and the remaining grid cells north of 88◦ S are interpolated using ordinary kriging. The median and root mean square difference between the DEM and 2.3 × 107 airborne laser altimeter measurements acquired during NASA Operation IceBridge campaigns are −0.30 and 13.50 m, respectively. The DEM uncertainty rises in regions of high slope, especially where elevation measurements were acquired in low-resolution mode; taking this into account, we estimate the average accuracy to be 9.5 m – a value that is comparable to or better than that of other models derived from satellite radar and laser altimetry Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Sheet Ice Shelves University College London: UCL Discovery Antarctic The Antarctic |
institution |
Open Polar |
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University College London: UCL Discovery |
op_collection_id |
ftucl |
language |
English |
description |
We present a new digital elevation model (DEM) of the Antarctic ice sheet and ice shelves based on 2.5 × 108 observations recorded by the CryoSat-2 satellite radar altimeter between July 2010 and July 2016. The DEM is formed from spatio-temporal fits to elevation measurements accumulated within 1, 2, and 5 km grid cells, and is posted at the modal resolution of 1 km. Altogether, 94 % of the grounded ice sheet and 98 % of the floating ice shelves are observed, and the remaining grid cells north of 88◦ S are interpolated using ordinary kriging. The median and root mean square difference between the DEM and 2.3 × 107 airborne laser altimeter measurements acquired during NASA Operation IceBridge campaigns are −0.30 and 13.50 m, respectively. The DEM uncertainty rises in regions of high slope, especially where elevation measurements were acquired in low-resolution mode; taking this into account, we estimate the average accuracy to be 9.5 m – a value that is comparable to or better than that of other models derived from satellite radar and laser altimetry |
format |
Article in Journal/Newspaper |
author |
Slater, T Shepherd, A Mcmillan, M Muir, A Gilbert, L Hogg, AE Konrad, H Parrinello, T |
spellingShingle |
Slater, T Shepherd, A Mcmillan, M Muir, A Gilbert, L Hogg, AE Konrad, H Parrinello, T A new digital elevation model of Antarctica derived from CryoSat-2 altimetry |
author_facet |
Slater, T Shepherd, A Mcmillan, M Muir, A Gilbert, L Hogg, AE Konrad, H Parrinello, T |
author_sort |
Slater, T |
title |
A new digital elevation model of Antarctica derived from CryoSat-2 altimetry |
title_short |
A new digital elevation model of Antarctica derived from CryoSat-2 altimetry |
title_full |
A new digital elevation model of Antarctica derived from CryoSat-2 altimetry |
title_fullStr |
A new digital elevation model of Antarctica derived from CryoSat-2 altimetry |
title_full_unstemmed |
A new digital elevation model of Antarctica derived from CryoSat-2 altimetry |
title_sort |
new digital elevation model of antarctica derived from cryosat-2 altimetry |
publishDate |
2018 |
url |
https://discovery.ucl.ac.uk/id/eprint/10076684/1/tc-12-1551-2018.pdf https://discovery.ucl.ac.uk/id/eprint/10076684/ |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Antarctica Ice Sheet Ice Shelves |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Ice Shelves |
op_source |
Cryosphere , 12 (4) pp. 1551-1562. (2018) |
op_relation |
https://discovery.ucl.ac.uk/id/eprint/10076684/1/tc-12-1551-2018.pdf https://discovery.ucl.ac.uk/id/eprint/10076684/ |
op_rights |
open |
_version_ |
1786166187177017344 |