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Improved GNSS-R bi-static altimetry and independent digital elevation models of Greenland and Antarctica from TechDemoSat-1

Improved GNSS-R bi-static altimetry and independent digital elevation models of Greenland and Antarctica from TechDemoSat-1
Improved GNSS-R bi-static altimetry and independent digital elevation models of Greenland and Antarctica from TechDemoSat-1
Improved digital elevation models (DEMs) of the Antarctic and Greenland ice sheets are presented, which have been derived from Global Navigation Satellite Systems-Reflectometry (GNSS-R). This builds on a previous study (Cartwright et al., 2018) using GNSS-R to derive an Antarctic DEM but uses improved processing and an additional 13 months of measurements, totalling 46 months of data from the UK TechDemoSat-1 satellite. A median bias of under 10 m and root-mean-square errors (RMSEs) of under 53 m for the Antarctic and 166 m for Greenland are obtained, as compared to existing DEMs. The results represent, compared to the earlier study, a halving of the median bias to 9 m, an improvement in coverage of 18 %, and a 4 times higher spatial resolution (now gridded at 25 km). In addition, these are the first published satellite altimetry measurements of the region surrounding the South Pole. Comparisons south of 88∘ S yield RMSEs of less than 33 m when compared to NASA's Operation IceBridge measurements. Differences between DEMs are explored, the limitations of the technique are noted, and the future potential of GNSS-R for glacial ice studies is discussed.
1994-0416
1909-1917
Cartwright, Jessica
8a249815-a421-41ad-b13a-eb48c97ee95d
Banks, Christopher J.
5d65ec1e-ed5f-48fc-9b05-3e46f24c35dc
Srokosz, Meric
5dbe3d43-0856-4f1b-82dc-4a8b8ae6ad7a
Cartwright, Jessica
8a249815-a421-41ad-b13a-eb48c97ee95d
Banks, Christopher J.
5d65ec1e-ed5f-48fc-9b05-3e46f24c35dc
Srokosz, Meric
5dbe3d43-0856-4f1b-82dc-4a8b8ae6ad7a

Cartwright, Jessica, Banks, Christopher J. and Srokosz, Meric (2020) Improved GNSS-R bi-static altimetry and independent digital elevation models of Greenland and Antarctica from TechDemoSat-1. The Cryosphere, 14 (6), 1909-1917. (doi:10.5194/tc-14-1909-2020).

Record type: Article

Abstract

Improved digital elevation models (DEMs) of the Antarctic and Greenland ice sheets are presented, which have been derived from Global Navigation Satellite Systems-Reflectometry (GNSS-R). This builds on a previous study (Cartwright et al., 2018) using GNSS-R to derive an Antarctic DEM but uses improved processing and an additional 13 months of measurements, totalling 46 months of data from the UK TechDemoSat-1 satellite. A median bias of under 10 m and root-mean-square errors (RMSEs) of under 53 m for the Antarctic and 166 m for Greenland are obtained, as compared to existing DEMs. The results represent, compared to the earlier study, a halving of the median bias to 9 m, an improvement in coverage of 18 %, and a 4 times higher spatial resolution (now gridded at 25 km). In addition, these are the first published satellite altimetry measurements of the region surrounding the South Pole. Comparisons south of 88∘ S yield RMSEs of less than 33 m when compared to NASA's Operation IceBridge measurements. Differences between DEMs are explored, the limitations of the technique are noted, and the future potential of GNSS-R for glacial ice studies is discussed.

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Accepted/In Press date: 13 May 2020
Published date: 15 June 2020

Identifiers

Local EPrints ID: 444452
URI: http://eprints.soton.ac.uk/id/eprint/444452
ISSN: 1994-0416
PURE UUID: bc70c84d-57c8-447d-96eb-30ea7b2e626f

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Date deposited: 20 Oct 2020 16:30
Last modified: 25 Nov 2021 18:39

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Contributors

Author: Jessica Cartwright
Author: Christopher J. Banks
Author: Meric Srokosz

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