Sentinel-1-derived monthly-averaged velocity components from Thwaites Eastern Ice Shelf, 2016 - 2022

Monthly velocity composites were produced from January 2016 to December 2022 using Sentinel-1 Interferometric Wide Swath (IW) mode using standard feature/speckle tracking procedures. From 2016 to 2021, up to 10 mosaics per month were averaged (Sentinel 1A and Sentinel 1B). After Sentinel-1B ended in December 2021, mosaics decreased to 2 per month (12-day pairs only from Sentinel 1A), producing more noisy data and larger data gaps. We used 6- and 12-day Sentinel-1 image pairs from the archive and a feature tracking window of 416 × 128 pixels (∼1 km in range and azimuth). We sampled the velocity field at 50 × 10 pixels before geocoding to the Antarctic Polar Stereographic projection (EPSG:3031) at 100 m resolution using the REMA mosaic DEM. DEM gaps were filled using Bedmap2 surface topography data.