The DMSP SSM/I-SSMIS Daily Polar Gridded Brightness Temperatures, Version 4 data set, available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) has been extended through 31 December 2018. Data at 85.5 GHz and 91.7 GHz are gridded at a resolution of 12.5 km, with all other frequencies at a resolution of 25 km.
Data set DOI: https://doi.org/10.5067/AN9AI8EO7PX0