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Double-difference TerraSAR-X interferograms and derived grounding lines at the grounding line of the Kamb and Whillans Ice Streams, West Antarctica, 2012-2023
This dataset includes double-difference interferograms derived from TerraSAR-X synthetic aperture radar data acquired at the grounding line downstream of Engelhardt Subglacial Lake on the Gould Coast, Antarctica, in September 2012, April 2016, July 2023 and October 2023. The September 2012, July 2023 and October 2023 interferograms were generated by Oliver J. Marsh (British Antarctic Survey) using the Gamma Remote Sensing software and geocoded with the Bedmap2 DEM. The April 2016 interferogram was generated by Dana Floricioiu (DLR, German Aerospace Center) using DLR's Integrated Wide Area Processor (IWAP; Rodriguez et al, 2013). The image processing information, acquisition time and coincident modelled tide heights for all data used to derive the TerraSAR-X interferograms are provided in the lineage section.
For each interferogram (September 2012, April 2016, July 2023 and October 2023) we provide a shapefile of the derived grounding line, which was manually traced along the landward boundary of the dense fringe belt associated with the vertical tidal motion of the ice (Point F).
This dataset was produced as part of the study: Freer et al. (2024) Synchronous lake drainage and grounding line retreat at Engelhardt Subglacial Lake, West Antarctica. Journal of Geophysical Research: Earth Surface.
Funding:
Bryony I. D. Freer (project lead) was supported by Natural Environment Research Council (NERC) Satellite Data in Environmental Science (SENSE) Centre for Doctoral Training (grant no. NE/T00939X/1). Dana Floricioiu (dataset creator) was supported by DLR's Polar Monitor II and Antarctic Ice Sheet CCI projects (ESA/Contract No. 4000126813/18/I-NB). Images were acquired under DLR TerraSAR-X science data proposal HYD3673 (PI Dana Floricioiu).
Simple
- Date (Creation)
- 2024-07-05
- Date (Revision)
- 2024-07-05
- Date (Publication)
- 2024-07-05
- Date (released)
- 2024-07-05
- Edition
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1.0
- Unique resource identifier
- https://doi.org/10.5285/e1d182b1-6aa6-434e-9390-f7956227cb82
- Codespace
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doi
- Unique resource identifier
- GB/NERC/BAS/PDC/01862
- Codespace
- Unique resource identifier
- NE/T00939X/1
- Codespace
-
award
- Other citation details
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Please cite this item as: Marsh, O., Floricioiu, D., & Freer, B. (2024). Double-difference TerraSAR-X interferograms and derived grounding lines at the grounding line of the Kamb and Whillans Ice Streams, West Antarctica, 2012-2023 (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/e1d182b1-6aa6-434e-9390-f7956227cb82
- Credit
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No credit.
- Status
- Completed
- Point of contact
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Organisation name Individual name Electronic mail address Role British Antarctic Survey Marsh, Oliver Author DLR, German Aerospace Center Floricioiu, Dana Author British Antarctic Survey Freer, Bryony Author NERC EDS UK Polar Data Centre Point of contact
- Maintenance and update frequency
- As needed
- Maintenance note
- Completed
- Theme
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SAR interferogram
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Siple Coast
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TerraSAR-X
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grounding line
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satellite
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- Place
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West Antarctica Antarctica
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Ross Ice Shelf Antarctica
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Gould Coast Antarctica
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Engelhardt Subglacial Lake Antarctica
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GEMET - INSPIRE themes, version 1.0
- Access constraints
- Other restrictions
- Other constraints
- no limitations to public access
- Access constraints
- Other restrictions
- Other constraints
- no limitations
- Use constraints
- License
- Other constraints
- Open Government Licence v3.0
- Use constraints
- Other restrictions
- Other constraints
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Data supplied under Open Government Licence v3.0
- Use constraints
- Other restrictions
- Other constraints
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None
- Unique resource identifier
- doi
- Codespace
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doi
- Association Type
- Cross reference
- Unique resource identifier
- doi
- Codespace
-
doi
- Association Type
- Cross reference
- Unique resource identifier
- doi
- Codespace
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doi
- Association Type
- Cross reference
- Unique resource identifier
- url
- Codespace
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url
- Association Type
- Cross reference
- Unique resource identifier
- url
- Codespace
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url
- Association Type
- Cross reference
- Spatial representation type
- Text, table
- Language
- English
- Character set
- UTF8
- Topic category
-
- Geoscientific information
))
- Begin date
- 2012-09-02
- End date
- 2012-09-24
- Supplemental Information
-
It is recommended that careful attention be paid to the contents of any data, and that the author be contacted with any questions regarding appropriate use. If you find any errors or omissions, please report them to polardatacentre@bas.ac.uk.
- Title
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European Petroleum Survey Group (EPSG) Geodetic Parameter Registry
- Date (Publication)
- 2008-11-12
- Cited responsible party
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Organisation name Individual name Electronic mail address Role European Petroleum Survey Group
Publisher
- Unique resource identifier
- urn:ogc:def:crs:EPSG::3031
- Version
-
6.18.3
Distributor
- Distributor contact
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Organisation name Individual name Electronic mail address Role NERC EDS UK Polar Data Centre Distributor
- Distributor format
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Name Version image/tiff application/octet-stream application/geopackage+sqlite3
- Units of distribution
-
bytes
- Transfer size
- 787480576
- OnLine resource
-
Protocol Linkage Name WWW:LINK-1.0-http--link
http://ramadda.data.bas.ac.uk/repository/entry/show?entryid=e1d182b1-6aa6-434e-9390-f7956227cb82 Get Data
- Units of distribution
-
bytes
- Transfer size
- 787480576
- OnLine resource
-
Protocol Linkage Name WWW:LINK-1.0-http--link
http://ramadda.data.bas.ac.uk/repository/entry/show?entryid=e1d182b1-6aa6-434e-9390-f7956227cb82 Get Data
- Units of distribution
-
bytes
- Transfer size
- 787480576
- OnLine resource
-
Protocol Linkage Name WWW:LINK-1.0-http--link
http://ramadda.data.bas.ac.uk/repository/entry/show?entryid=e1d182b1-6aa6-434e-9390-f7956227cb82 Get Data
- Hierarchy level
- Dataset
- Statement
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Methodology:
TerraSAR-X data were acquired in SLC format with 11-day separation between pairs. Images were co-registered using speckle tracking with 512 x 512 windows with the secondary image then resampled to the reference image. Interferograms were calculated with 4 x 4 multilooking. Baselines were derived from satellite orbital parameters and flat-Earth phase contribution removed. Adaptive spectral filtering was applied to remove noise. Interferograms were geocoded to BEDMAP-2 surface topography (Fretwell et al., 2013) downsampled to 8 m grid, using a bicubic spline.
The derived grounding line for each interferogram were manually traced along the landward boundary of the dense fringe belt associated with the vertical tidal motion of the ice (Point F; c.f. Rignot, 1996; Rignot et al., 2011). For the April 2016 interferogram, an additional grounding line was traced at the inland limit of the weaker fringes that indicates ephemeral grounding over the ice plain further inland (id=2).
*** Image processing information and acquisition time for all TerraSAR-X double-difference interferograms ****
The tidal heights for each individual pass were calculated at [83.161°S, 160.5°W] using the CATS2008 model (Howard et al., 2019), corrected for the inverse barometer effect (IBE) using the daily air pressure values from the National Center for Environmental Prediction and the National Center for Atmospheric Research Reanalysis (NCEP/NCA). The expected vertical height difference for each interferogram is calculated using the tides from individual passes: [t2-t1] + [t3-t2].
DInSAR date:
***September 2012:
- Spatial resolution [m] (ground range x azymuth): 2.5 x3.3 (4x4 multilooking)
- DEM for geocoding: Bedmap2 (8 m grid)
- Pass date/time / tide height, corrected IBE [m]
* t1: 2012-09-02 14:38:00 / -0.349
* t2: 2012-09-13 14:38:00 / -0.507
* t3: 2012-09-24 14:38:00 / +0.206
- Expected height difference [m] [t2-t1] + [t2-t3]: -0.872
***April 2016:
- Spatial resolution [m] (ground range x azymuth): 2.5 x3.3 (4x4 multilooking)
- DEM for geocoding: Bedmap2 (8 m grid)
- Pass date/time / tide height, corrected IBE [m]
* t1: 2016-04-08 14:47:00 / -0.460
* t2: 2016-04-19 14:47:00 / -0.076
* t3: 2016-04-30 14:47:00 / -0.372
- Expected height difference [m] [t2-t1] + [t2-t3]: +0.679
***July 2023:
- Spatial resolution [m] (ground range x azymuth): 2.5 x3.3 (4x4 multilooking)
- DEM for geocoding: Bedmap2 (8 m grid)
- Pass date/time / tide height, corrected IBE [m]
* t1: 2023-06-27 06:31:00 / -0.259
* t2: 2023-07-08 06:31:00 / +0.023
* t3: 2023-07-19 06:31:00 / +0.139
- Expected height difference [m] [t2-t1] + [t2-t3]: +0.166
***October 2023:
- Spatial resolution [m] (ground range x azymuth): 2.5 x3.3 (4x4 multilooking)
- DEM for geocoding: Bedmap2 (8 m grid)
- Pass date/time / tide height, corrected IBE [m]
* t1: 2023-10-03 06:48:00 / -0.608
* t2: 2023-10-14 06:48:00 / -0.359
* t3: 2023-10-25 06:48:00 / -0.802
- Expected height difference [m] [t2-t1] + [t2-t3]: +0.691
Data are provided in the WGS1984 geographic Coordinate system (EPSG:4326).
Data collection:
TerraSAR-X satellite mission data (operating on TSX-1 and TDX-1 satellites)
Gamma Remote Sensing software
DLR's processing chain for the Grounding Line Location (GLL) parameter of Antarctic Ice Sheets cci project (Muir et al., 2020)
Data quality:
Resolution of the dataset:
** September 2012:
- Pixel resolution [m]: 20
- Spatial resolution (range) [m]: 2.5
- Spatial resolution (azimuth) [m]: 3.3
** April 2016:
- Pixel resolution [m]: 4.72
- Spatial resolution (range) [m]: 2.5
- Spatial resolution (azimuth) [m]: 3.3
** July 2023:
- Pixel resolution [m]: 8
- Spatial resolution (range) [m]: 2.5
- Spatial resolution (azimuth) [m]: 3.3
** October 2023:
- Pixel resolution [m]: 8
- Spatial resolution (range) [m]: 2.5
- Spatial resolution (azimuth) [m]: 3.3
Please note that the 2012 and 2016 interferograms were processed in a slightly different way to the July/Oct 2023 interferograms which is why the colour ramps appear slightly differently but this does not affect the data.
Metadata
- File identifier
- e1d182b1-6aa6-434e-9390-f7956227cb82 XML
- Metadata language
- English
- Character set
- UTF8
- Hierarchy level
- Dataset
- Hierarchy level name
-
dataset
- Date stamp
- 2024-07-05
- Metadata standard name
-
ISO 19115 Geographic Information - Metadata
- Metadata standard version
-
ISO 19115:2003(E)
- Metadata author
-
Organisation name Individual name Electronic mail address Role NERC EDS UK Polar Data Centre Point of contact
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