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Description

This enhanced Level-3 (L3) product provides a daily composite of Northern Hemisphere landscape freeze/thaw conditions retrieved by the Soil Moisture Active Passive (SMAP) radiometer from 6:00 a.m. descending and 6:00 p.m. ascending half-orbit passes. This product is derived from SMAP Level-1C (L1C) interpolated brightness temperatures. Backus-Gilbert optimal interpolation techniques are used to extract maximum information from SMAP antenna temperatures and convert them to brightness temperatures, which are posted to the 9 km Equal-Area Scalable Earth Grid, Version 2.0 (EASE-Grid 2.0) in a Northern Hemisphere azimuthal projection.

Version Description

First public data release

Product Summary

Platforms
SMAP Observatory
Instruments
SMAP L-BAND RADIOMETER
Spatial Extent

N: 85.044 S: 45 E: 180 W: -180

Spatial Resolution
9 Kilometers x 9 Kilometers
Location
NORTHERN HEMISPHERE
Coordinate System
CARTESIAN
Granule Spatial Representation
CARTESIAN
Temporal Extent
2015-03-31 to 2018-06-03
Temporal Resolution
1 Day
Concept ID
C2872769794-NSIDC_CPRD
Data State
DEPRECATED
Number of Files/Granules
0
Processing Level
3
Published
Updated
Science Keywords
Transition Direction

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

Dunbar, R., Xu, X., Colliander, A., Derksen, C., Kimball, J., & Kim, Y. (2016). SMAP Enhanced L3 Radiometer Northern Hemisphere Daily 9 km EASE-Grid Freeze/Thaw State, Version 1 [Dataset]. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/Z08PIR8RGVR2 Date Accessed: 2026-06-17

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