Abstract:
Velocity maps were derived, for regions of Larsen C ice shelf, from satellite imagery spanning the period November 2017 to April 2019. This period was selected to monitor any change in the velocity field of Larsen C, in the months following the calving of iceberg A68 from the front of the ice shelf. The archive contains two sets of maps. The first are derived from Sentinel-1 satellite data, and span the complete ice shelf for the full 18-month epoch. The second are derived from TerraSAR-X data, and show high-resolution velocity trends between 2017 and 2018, covering the frontal region of Larsen C ice shelf. The maps were produced by Professor Adrian Luckman, Swansea University.
The data is part of the NERC RACE project, NE/R012334/1.
Keywords:
Larsen, flow, ice shelf, iceberg calving, satellite, velocity
Luckman, A. (2020). Satellite-derived velocity maps for Larsen C Ice Shelf, Antarctica, between November 2017-April 2019 (Version 1.0) [Data set]. UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation. https://doi.org/10.5285/e5a119c7-15be-4ad8-bf70-6cc8d112af87
| Access Constraints: | No restrictions apply. |
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| Use Constraints: | This data is supplied under Open Government Licence v3.0 http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/. |
| Creation Date: | 2020-11-16 |
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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 Polar Data Centre |
| Role(s) | Metadata Author |
| Organisation | British Antarctic Survey |
| Name | Adrian Luckman |
| Role(s) | Investigator, Technical Contact |
| Organisation | Swansea University |
| Parent Dataset: | N/A |
| Quality: | Velocity retrieval error is generally found to be one tenth of a pixel or better over the repeat period between images, depending on how surface conditions (melt, snowfall) have changed over that period. For these datasets, therefore, the error will be approximately: TerraSAR-X: 0.2m (2m resolution x 0.1) over 11 days, or ~0.02 m/day. Sentinel-1: 1m (10m resolution x 0.1) over 6 days, or ~0.2 m/day. |
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| Lineage: | Data was acquired by TerraSAR-X and Sentinel-1 satellites. The TerraSAR-X data acquisitions were ordered specifically for the RACE68 Project. Standard 'feature tracking' algorithms were applied to derive ice surface velocity. Key parameters in the feature tracking were: TerraSAR-X: window size 500 x 500 (pixels ~2m resolution), sample spacing of 20 pixels. Sentinel-1: window size 416 x 128 (pixels ~10m resolution), sample spacing of 10 pixels. |
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| Temporal Coverage: | |
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| Start Date | 2017-11-01 |
| End Date | 2019-04-30 |
| Spatial Coverage: | |
| Latitude | |
| Southernmost | -69.5 |
| Northernmost | -65.4 |
| Longitude | |
| Westernmost | -67.1 |
| Easternmost | -58.9 |
| 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 | 1 meter - < 30 meters |
| Vertical Resolution | N/A |
| Vertical Resolution Range | N/A |
| Temporal Resolution | N/A |
| Temporal Resolution Range | N/A |
| Location: | |
| Location | Antarctica |
| Detailed Location | Larsen C Ice Shelf |
| Data Collection: | Feature tracking was applied using Gamma Software with a December 2017 license. |
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| Distribution: | |
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| Distribution Media | Online Internet (HTTP) |
| Distribution Size | 3.3 GB |
| Distribution Format | TIFF |
| Fees | N/A |
| Data Storage: | Seven velocity maps from TerraSAR-X, 82 from Sentinel-1. |