We present a new compilation of multibeam-bathymetric data for the inner Amundsen Sea continental shelf beyond Thwaites and Pine Island glaciers (bounding box: 100W to 110W, 74S to 75.5S). The region includes Pine Island Bay, marine areas offshore the Thwaites Ice Shelf to the Crosson Ice Shelf, and covers an area of 74,750 km2. The bathymetric grids were compiled from all available multibeam echosounder (MBES) data acquired by UK, German, USA and Korean scientific cruises to the area between 1999 and 2019 (see lineage). Three grids of sea floor elevation data are available in a range of formats (ESRI ascii interchange format and GMT-compatible netCDF 4byte float): a 50-m resolution grid with no interpolation, a 50-m grid interpolated up to 300 m from cells with real data, and a 500-m resolution grid with no interpolation. Note that these grids have not been merged with regional bathymetric grids and, therefore, do not have continuous coverage (i.e. cells are only populated where multibeam data exist). This work was supported by grants from the National Science Foundation (NSF: Grant OPP- 1738942) and Natural Environment Research Council (NERC: Grant NE/S006664/1) as part of the International Thwaites Glacier Collaboration (ITGC) programme, and grants NE/J005770/1 and NE/J005703/1 as part of the iSTAR Programme.

ADMAP2 is the second generation Antarctic magnetic compilation for the region south of 60 deg S. This dataset includes 3.5 million line-km of aeromagnetic and marine magnetic data from multiple nations, which is more than double that in the original ADMAP compilation. For the new compilation, the magnetic data sets were corrected for the International Geomagnetic Reference Field, diurnal effects, and high-frequency errors and levelled, gridded, and stitched together. The new dataset provides an unprecedented view of the sub-surface geological structure of Antarctica. It represents a major milestone of the international Scientific Committee on Antarctic Research (SCAR) Antarctic Digital Magnetic Anomaly (ADMAP) Project. Funding was provided by the Korea Polar Research Institute (KOPRI). Grant Numbers: PM15040, PE17050.