e1d182b1-6aa6-434e-9390-f7956227cb82 eng utf8 dataset dataset NERC EDS UK Polar Data Centre +44 (0)1223 221400 British Antarctic Survey, High Cross, Madingley Road Cambridge Cambridgeshire CB3 0ET United Kingdom polardatacentre@bas.ac.uk https://www.bas.ac.uk/team/business-teams/information-services/uk-polar-data-centre/ information pointOfContact 2024-07-05 ISO 19115 Geographic Information - Metadata ISO 19115:2003(E) European Petroleum Survey Group (EPSG) Geodetic Parameter Registry 2008-11-12 publication European Petroleum Survey Group EPSGadministrator@iogp.org https://www.epsg-registry.org/ EPSG Geodetic Parameter Dataset The EPSG Geodetic Parameter Dataset is a structured dataset of Coordinate Reference Systems and Coordinate Transformations, accessible through this online registry. information publisher urn:ogc:def:crs:EPSG::3031 6.18.3 Double-difference TerraSAR-X interferograms and derived grounding lines at the grounding line of the Kamb and Whillans Ice Streams, West Antarctica, 2012-2023 2024-07-05 creation 2024-07-05 revision 2024-07-05 publication 2024-07-05 released 1.0 https://doi.org/10.5285/e1d182b1-6aa6-434e-9390-f7956227cb82 doi GB/NERC/BAS/PDC/01862 https://data.bas.ac.uk/ NE/T00939X/1 award 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 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). No credit. completed Marsh, Oliver British Antarctic Survey Researcher author Floricioiu, Dana DLR, German Aerospace Center Researcher author Freer, Bryony British Antarctic Survey Researcher author NERC EDS UK Polar Data Centre +44 (0)1223 221400 British Antarctic Survey, High Cross, Madingley Road Cambridge Cambridgeshire CB3 0ET United Kingdom PDCServiceDesk@bas.ac.uk https://www.bas.ac.uk/team/business-teams/information-services/uk-polar-data-centre/ information pointOfContact asNeeded completed EARTH SCIENCE > Cryosphere > Glaciers/Ice Sheets EARTH SCIENCE > Cryosphere > Snow/Ice EARTH SCIENCE > Spectral/Engineering > Radar theme Global Change Master Directory (GCMD) Science Keywords 2026-01-27 publication 23 Global Change Data Center, Science and Exploration Directorate, Goddard Space Flight Center (GSFC) National Aeronautics and Space Administration (NASA) Greenbelt MD United States of America https://earthdata.nasa.gov/about/gcmd/global-change-master-directory-gcmd-keywords Global Change Master Directory (GCMD) Keywords The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords. information publisher SAR interferogram Siple Coast TerraSAR-X grounding line satellite theme West Antarctica Antarctica Ross Ice Shelf Antarctica Gould Coast Antarctica Engelhardt Subglacial Lake Antarctica place Elevation Meteorological geographical features theme GEMET - INSPIRE themes, version 1.0 2021-01-06 revision otherRestrictions no limitations to public access otherRestrictions no limitations license Open Government Licence v3.0 otherRestrictions Data supplied under Open Government Licence v3.0 otherRestrictions None doi doi crossReference doi doi crossReference doi doi crossReference url url crossReference url url crossReference textTable eng utf8 geoscientificInformation -163.0803 -158.491 -83.8443 -83.2598 2012-09-02 2012-09-24 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. NERC EDS UK Polar Data Centre +44 (0)1223 221400 British Antarctic Survey, High Cross, Madingley Road Cambridge Cambridgeshire CB3 0ET United Kingdom PDCServiceDesk@bas.ac.uk https://www.bas.ac.uk/team/business-teams/information-services/uk-polar-data-centre/ information distributor image/tiff application/octet-stream application/geopackage+sqlite3 bytes 787480576 http://ramadda.data.bas.ac.uk/repository/entry/show?entryid=e1d182b1-6aa6-434e-9390-f7956227cb82 WWW:LINK-1.0-http--link Get Data Download data download bytes 787480576 http://ramadda.data.bas.ac.uk/repository/entry/show?entryid=e1d182b1-6aa6-434e-9390-f7956227cb82 WWW:LINK-1.0-http--link Get Data Download data download bytes 787480576 http://ramadda.data.bas.ac.uk/repository/entry/show?entryid=e1d182b1-6aa6-434e-9390-f7956227cb82 WWW:LINK-1.0-http--link Get Data Download data download dataset 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. asNeeded completed