Updated grounding line mapping in the Amundsen Sea Embayment, Antarctica, from 1-day repeat Sentinel-1 SAR data

This dataset contains data described in the article: Brief communication: Updated grounding line mapping in the Amundsen Sea Embayment, Antarctica, from 1-day repeat Sentinel-1 SAR data by Jonas K. Andersen, Romain Millan, Eric Rignot, Bernd Scheuchl, Jean Baptiste Barré, and Anders, A. Bjørk (Submitted to The Cryosphere, September 11th 2025). The dataset provides an updated delineation of glacier grounding lines in the Amundsen Sea Embayment (ASE), West Antarctica, based on high-resolution double-difference SAR interferometry from Sentinel-1 1-day repeat-pass acquisitions. The 1-day repeat acquisitions were collected during the Sentinel-1C in-orbit commissioning phase in January-March 2025. The delineation spans the region between the Abbot and Getz ice shelves and includes the grounding zones of Pine Island, Thwaites, Pope, Smith, Kohler, and other outlet glaciers. The dataset includes: Grounding Line Vector File (S1_1day_GL_2025_ASE.zip)A polyline shapefile delineating the 2025 grounding line, derived using double-difference SAR interferometry. The grounding line is delineated at the inland limit of the vertical displacements induced by tidal flexure and has been manually interpreted from high-coherence interferograms. Format: ESRI Shapefile (.shp, .shx, .dbf, .prj) CRS: EPSG:3031 – WGS 84 / Antarctic Polar Stereographic Acquisition dates: January 17th - March 7th 2025 Coverage: Amundsen Sea Embayment Geocoded Interferograms (TXXX.zip)A set of Sentinel-1 geocoded double-difference interferograms used to delineate the grounding line. These are provided as binary raster files with associated GDAL-compatible .vrt metadata files and ENVI-style header files .hdr , suitable for viewing in GIS software. Each double-difference product corresponds to the phase difference between a pair of 1-day interferograms. Interferograms were obtained from 4 different orbit/tracks and are stored in separate folders (with naming convention 'TXXX'). Format: .pha/.hdr (binary raster, 32-bit float big-endian phase image and header file) + .vrt (GDAL Virtual Raster metadata file - can be read directly in e.g. QGIS) Naming convention: date1_date2_date3_date4.[pha/vrt] Resolution: 50 x 50 m Units: Radians CRS: EPSG:3031 – WGS 84 / Antarctic Polar Stereographic