SMAP Radar SAR and SIR-Enhanced Twice-Daily EASE-Grid 2.0 Radar Backscatter
NSIDC-0774 doi:10.5067/SCKWZSWQ7HPL

Averaged SAR and SIR-enhanced-resolution SMAP L-band radar backscatter on
twice-daily EASE-Grid 2.0 maps generated by the Scatterometer Climate
Record Pathfinder by David G. Long at Brigham Young University and
Julie Z. Miller at NSIDC

citation = "Long, D. G., and J. Z. Miller. 2022. SMAP Radar SAR and
SIR-Enhanced Twice-Daily EASE-Grid 2.0 Radar Backscatter. Version 1.0.\
[Indicate subset used].\ Boulder, Colorado USA: NASA DAAC at the National
Snow and Ice Data Center. doi:10.5067/SCKWZSWQ7HPL

SMAP radar images provide coverage for days 103 to 186 of 2015 with
interval lengths of 1, 3, and 8 days for Footprint, Slice, and Synthetic
Aperture Radar (SAR) data in EASE2 Grid North, South, and Global (T)
projections.  All files are in netcdf format.

Data files (in this location) are orgained by data type and period length
in subdirectories.

The ancillary files
NSIDC-0774-EASE2_N3.125km-SMAP_SMAP_Radar_SAR-v1.0.nc
NSIDC-0774-EASE2_S3.125km-SMAP_SMAP_Radar_SAR-v1.0.nc
NSIDC-0774-EASE2_T3.125km-SMAP_SMAP_Radar_SAR-v1.0.nc
contain the latitude and longitude of each pixel as well as a land map and
a distance (in km) of ocean pixels from the nearest land or major ice shelf.