Double-difference TerraSAR-X interferograms and derived grounding lines at the grounding line of the Kamb and Whillans Ice Streams, West Antarctica, 2012-2023 ...

• Main Authors: Marsh, Oliver, Floricioiu, Dana, Freer, Bryony
• Format: Dataset
• Language: English
• Published: NERC EDS UK Polar Data Centre 2024
• Subjects: "EARTH SCIENCE","CRYOSPHERE","GLACIERS/ICE SHEETS"; "EARTH SCIENCE","CRYOSPHERE","SNOW/ICE"; "EARTH SCIENCE","SPECTRAL/ENGINEERING","RADAR"; SAR interferogram; Siple Coast; TerraSAR-X; grounding line; satellite; Antarc*; Antarctic; Antarctica; British Antarctic Survey; West Antarctica
• Online Access: https://dx.doi.org/10.5285/e1d182b1-6aa6-434e-9390-f7956227cb82; https://data.bas.ac.uk/full-record.php?id=GB/NERC/BAS/PDC/01862

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 ... : 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 ...