Thwaites Glacier ice surface speed change from January 2012 to January 2021
GB/NERC/BAS/PDC/01506
Abstract:
A map of changes in ice surface speed in metres/year for Thwaites Glacier, West Antarctica, between January 2012 and January 2021. Speeds based on feature tracking of satellite synthetic aperture radar data.
The work was funded by NERC projects NE/P011365/1 and NE/S006605/1.
Citation:
Bevan, S., Luckman, A., & Benn, D. (2021). Thwaites Glacier ice surface speed change from January 2012 to January 2021 (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/668bf042-d0de-4741-a62e-2ae93b6f7106
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License
| Access: | No restrictions apply. |
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| Use: | Data supplied under Open Government Licence v3.0 http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/. |
Basic Information
| Creation Date: | 2021-05-25 |
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| Dataset Progress: | Complete |
| Dataset Language: | English |
| ISO Topic Categories: |
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| Parameters: |
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Additional Information
| Reference: | Bevan, S. L., Luckman, A. J., Benn, D. I., Adusumilli, S., and Crawford, A.: Brief communication: Thwaites Glacier cavity evolution, The Cryosphere, 15, 3317-3328, https://doi.org/10.5194/tc-15-3317-2021, 2021. Liu, H., K. C. Jezek, B. Li, and Z. Zhao. 2015. Radarsat Antarctic Mapping Project Digital Elevation Model, Version 2. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. doi: https://doi.org/10.5067/8JKNEW6BFRVD. |
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| Quality: | All feature-tracked displacements were filtered twice: first by a signal to noise ratio based on the cross-correlation of image patches, and then according to deviation from the mean displacement within a neighbourhood. The displacements were converted from the SAR image geometry to ground range geometry, and the results geocoded using the RAMP DEM (Liu et al., 2015). N/A values in the difference geotiff are where either the 2012 or 2021 data are missing. | |
| Lineage/Methodology: | January 2012 speeds were measures using feature-tracking of TerraSAR-X data between a pair of images acquired on 17/01/2012 and 28/01/2012. Speeds were measured at a horizontal resolution of 40 m. Image data were supplied by DLR. The 2021 speeds were measured using feature-tracking Sentinel-1A and Sentinel-1B images and are a mean of all ten 6- or 12-day pairs acquired in January 2021. Speeds were measured at a horizontal resolution of 100 m and oversampled to 40 m before differencing (2021-2012) with the 2012 speeds. Image data were supplied by ESA. |
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Extent
| Temporal Coverage: | |
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| Start Date | 2012-01-01 |
| End Date | 2021-01-31 |
| Spatial Coverage: | |
| Latitude | |
| Southernmost | -77 |
| Northernmost | -74 |
| Longitude | |
| Westernmost | -109 |
| Easternmost | -106 |
| 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 | 30 meters - < 100 meters |
| Vertical Resolution | N/A |
| Vertical Resolution Range | N/A |
| Temporal Resolution | N/A |
| Temporal Resolution Range | N/A |
| Location: | |
| Location | Antarctica |
| Detailed Location | Thwaites Glacier |
Instrumentation
| Sensor(s): |
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| Source(s): |
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| Data Collection: | Feature-tracking was carried out using Gamma Remote Sensing software 20190603. |
Storage
| Distribution: | |
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| Distribution Media | Online Internet (HTTP) |
| Distribution Size | 8.7 MB |
| Distribution Format | TIFF |
| Fees | N/A |
| Data Storage: | The dataset comprises one GeoTIFF. The data are in a Polar Stereographic projection (EPSG:3031) covering Thwaites Glacier. Top left corner is (-1550800 m east, -437360 north). 54.16 km wide (1354 pixels), 65.92 km long (1648 lines). Horizontal spatial resolution is 40 x 40 m. |