Abstract:
Improved Digital Elevation Model (DEM) of the Antarctic Ice Sheet 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. A median bias of under 10 m and root-mean-square (RMS) errors of under 53 m are obtained, as compared to existing DEMs.
Funding was provided by NERC grant NE/L002531/1.
Keywords:
Altimetry, Antarctic Ice Sheet, Antarctica, DEM, GNSS-R, TechDemoSat-1
Cartwright, J. (2020). Independent Digital Elevation Model of Antarctica from GNSS-R data from TechDemoSat-1 - VERSION 2.0 (Version 2.0) [Data set]. UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation. https://doi.org/10.5285/c7a6d602-ab52-4f3c-90a4-42d0cd9f62d3
| Access Constraints: | No restrictions apply. |
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| Use Constraints: | This data is governed by the NERC data policy http://www.nerc.ac.uk/research/sites/data/policy/ and supplied under Open Government Licence v3 http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/. |
| Creation Date: | 2020-04-30 |
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| Dataset Progress: | Complete |
| Dataset Language: | English |
| ISO Topic Categories: |
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| Parameters: |
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| Personnel: | |
| Name | UK PDC |
| Role(s) | Metadata Author |
| Organisation | British Antarctic Survey |
| Name | Jessica Cartwright |
| Role(s) | Investigator, Technical Contact |
| Organisation | University of Southampton |
| Name | Christopher J Banks |
| Role(s) | Investigator |
| Organisation | National Oceanography Centre |
| Name | Meric Srokosz |
| Role(s) | Investigator |
| Organisation | National Oceanography Centre |
| Parent Dataset: | N/A |
| Reference: | Cartwright, J., Banks, C. J., and Srokosz, M.: Improved GNSS-R bi-static altimetry and independent DEMs of Greenland and Antarctica from TechDemoSat-1, The Cryosphere Discuss., https://doi.org/10.5194/tc-2019-289, in review, 2020. | |
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| Quality: | A median bias of under 10 m and root-mean-square (RMS) errors of under 53 m are obtained, as compared to existing DEMs. This represents, compared to the earlier study, a halving of the median bias to 9 m, an improvement in coverage of 18 %, and a four times higher spatial resolution (now gridded at 25 km). These are the first published satellite altimetry measurements of the region surrounding the South Pole. Comparisons south of 88° S yield RMS errors of less than 33 m when compared to NASA's Operation IceBridge measurements. |
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| Lineage: | Gridded group delay altimetry from TechDemoSat-1's GNSS-R data collected between September 2014 and December 2018. For full details see Cartwright et al., 2020. | |
| Temporal Coverage: | |
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| Start Date | 2014-09-01 |
| End Date | 2018-12-31 |
| Spatial Coverage: | |
| Latitude | |
| Southernmost | -90 |
| Northernmost | -60 |
| Longitude | |
| Westernmost | -180 |
| Easternmost | 180 |
| Altitude | |
| Min Altitude | N/A |
| Max Altitude | N/A |
| Depth | |
| Min Depth | N/A |
| Max Depth | N/A |
| Data Resolution: | |
| Latitude Resolution | N/A |
| Longitude Resolution | N/A |
| Horizontal Resolution Range | 10 km - < 50 km or approximately .09 degree - < .5 degree |
| Vertical Resolution | N/A |
| Vertical Resolution Range | N/A |
| Temporal Resolution | N/A |
| Temporal Resolution Range | N/A |
| Location: | |
| Location | Antarctica |
| Detailed Location | N/A |
| Data Collection: | SGR-ReSI, TechDemoSat-1 |
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| Distribution: | |
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| Distribution Media | Online Internet (HTTP) |
| Distribution Size | 1.6 MB |
| Distribution Format | netCDF |
| Fees | N/A |
| Data Storage: | One netCDF file. |