
Version Summary
Changes to this version include:
- Transitioned to Validated-Stage 2
- Calibration parameters were adjusted to reduce calibration jumps and drift previously present in the Beta-release; as a result, calibration now meets its less than 0.4 K/month stability back to 31 March 2015
- Additional bit-error checking was performed on Level-0 instrument telemetry
For the full major and minor version history, go to https://nsidc.org/data/smap/data_versions.
Overview
Each Level-1A (L1A) granule incorporates all radiometer data downlinked from the Soil Moisture Active Passive (SMAP) spacecraft for one specific half orbit. The data are scaled instrument counts of the following:
- The first four raw moments of the fullband channel for both vertical and horizontal polarizations
- The complex cross-correlations of the fullband channel
- The 16 subband channels for both vertical and horizontal polarizations