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 improv...
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ftnerc:oai:nora.nerc.ac.uk:528299 2023-05-15T13:41:45+02:00 Improved GNSS-R bi-static altimetry and independent digital elevation models of Greenland and Antarctica from TechDemoSat-1 Cartwright, Jessica Banks, Christopher J. Srokosz, Meric 2020-06-15 text http://nora.nerc.ac.uk/id/eprint/528299/ https://nora.nerc.ac.uk/id/eprint/528299/1/tc-14-1909-2020.pdf https://doi.org/10.5194/tc-14-1909-2020 en eng https://nora.nerc.ac.uk/id/eprint/528299/1/tc-14-1909-2020.pdf Cartwright, Jessica; Banks, Christopher J. orcid:0000-0003-4457-0876 Srokosz, Meric orcid:0000-0002-7347-7411 . 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. https://doi.org/10.5194/tc-14-1909-2020 <https://doi.org/10.5194/tc-14-1909-2020> cc_by_4 CC-BY Publication - Article PeerReviewed 2020 ftnerc https://doi.org/10.5194/tc-14-1909-2020 2023-02-04T19:50:59Z 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. Article in Journal/Newspaper Antarc* Antarctic Antarctica Greenland South pole South pole The Cryosphere Natural Environment Research Council: NERC Open Research Archive Antarctic The Antarctic Greenland South Pole Cartwright ENVELOPE(-57.018,-57.018,53.708,53.708) The Cryosphere 14 6 1909 1917 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Cartwright, Jessica Banks, Christopher J. Srokosz, Meric |
spellingShingle |
Cartwright, Jessica Banks, Christopher J. Srokosz, Meric Improved GNSS-R bi-static altimetry and independent digital elevation models of Greenland and Antarctica from TechDemoSat-1 |
author_facet |
Cartwright, Jessica Banks, Christopher J. Srokosz, Meric |
author_sort |
Cartwright, Jessica |
title |
Improved GNSS-R bi-static altimetry and independent digital elevation models of Greenland and Antarctica from TechDemoSat-1 |
title_short |
Improved GNSS-R bi-static altimetry and independent digital elevation models of Greenland and Antarctica from TechDemoSat-1 |
title_full |
Improved GNSS-R bi-static altimetry and independent digital elevation models of Greenland and Antarctica from TechDemoSat-1 |
title_fullStr |
Improved GNSS-R bi-static altimetry and independent digital elevation models of Greenland and Antarctica from TechDemoSat-1 |
title_full_unstemmed |
Improved GNSS-R bi-static altimetry and independent digital elevation models of Greenland and Antarctica from TechDemoSat-1 |
title_sort |
improved gnss-r bi-static altimetry and independent digital elevation models of greenland and antarctica from techdemosat-1 |
publishDate |
2020 |
url |
http://nora.nerc.ac.uk/id/eprint/528299/ https://nora.nerc.ac.uk/id/eprint/528299/1/tc-14-1909-2020.pdf https://doi.org/10.5194/tc-14-1909-2020 |
long_lat |
ENVELOPE(-57.018,-57.018,53.708,53.708) |
geographic |
Antarctic The Antarctic Greenland South Pole Cartwright |
geographic_facet |
Antarctic The Antarctic Greenland South Pole Cartwright |
genre |
Antarc* Antarctic Antarctica Greenland South pole South pole The Cryosphere |
genre_facet |
Antarc* Antarctic Antarctica Greenland South pole South pole The Cryosphere |
op_relation |
https://nora.nerc.ac.uk/id/eprint/528299/1/tc-14-1909-2020.pdf Cartwright, Jessica; Banks, Christopher J. orcid:0000-0003-4457-0876 Srokosz, Meric orcid:0000-0002-7347-7411 . 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. https://doi.org/10.5194/tc-14-1909-2020 <https://doi.org/10.5194/tc-14-1909-2020> |
op_rights |
cc_by_4 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/tc-14-1909-2020 |
container_title |
The Cryosphere |
container_volume |
14 |
container_issue |
6 |
container_start_page |
1909 |
op_container_end_page |
1917 |
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1766156993509195776 |