CryoSat-2-derived elevation model of Antarctica, with 1000m pixel resolution and uncertainty of 3 m ± 15 m.
This DEM will tend to have fewer errors in the inland ice areas and more near the coast or other areas with sharp relief.

Helm, V., Humbert, A., and Miller, H.: Elevation and elevation change of Greenland and Antarctica derived from CryoSat-2, The Cryosphere, 8, 1539-1559, https://doi.org/10.5194/tc-8-1539-2014, 2014.

https://www.the-cryosphere.net/8/1539/2014/tc-8-1539-2014.html

Raw GeoTIFF downloads:
http://store.pangaea.de/Publications/HelmV_etal_2014/DEM_ANT_CS_20130901.zip
http://store.pangaea.de/Publications/HelmV_etal_2014/ERROR_DEM_ANT_CS_20140131.zip