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Description

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 consisting of the first four raw moments of the fullband channel (vertical and horizontal polarizations); the complex cross-correlations of the fullband channel; and the 16 subband channels (vertical and horizontal polarizations).

Version Description

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/version-history

Product Summary

Platforms
SMAP
Instruments
SMAP L-BAND RADIOMETER
Spatial Extent

N: 86.4 S: -86.4 E: 180 W: -180

Spatial Resolution
40 Kilometers x 40 Kilometers
Location
GLOBAL LAND
Coordinate System
CARTESIAN
Granule Spatial Representation
GEODETIC
Temporal Extent
2015-03-31 to Present
Concept ID
C2938661641-NSIDC_CPRD
Data State
ACTIVE
Number of Files/Granules
112127
Processing Level
1A
Published
Science Keywords
Sensor Counts

Citation

Citation is critically important for dataset documentation and discovery. This dataset is openly shared, without restriction, in accordance with the EOSDIS Data Use and Citation Guidance.

Copy Citation

Piepmeier, J., Kim, E., Mohammed, P., Peng, J., & Ruf, C. (2015). SMAP L1A Radiometer Time-Ordered Parsed Telemetry, Version 2 [Data set]. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/JGV8EY3FGAH1 Date Accessed: 2026-01-20

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