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Description

<p>This Level-3 (L3) product provides a daily global composite of Northern Hemisphere landscape freeze/thaw conditions retrieved by the Soil Moisture Active Passive (SMAP) radar from 6:00 a.m. descending and 6:00 p.m. ascending half-orbit passes. Input SMAP L-band backscatter data used to derive freeze/thaw are resampled to an Earth-fixed, global cylindrical 3 km Equal-Area Scalable Earth Grid, Version 2.0 (EASE-Grid 2.0). <!--A variety of ancillary data are also used as input, such as landcover classification and open water body fraction.--> </p>
<p><strong>Note:</strong> These data are Beta-release quality, meaning that they have not undergone full validation and may still contain significant errors. </p>

Version Description

First public data release

Product Summary

Platforms
SMAP Observatory
Instruments
SMAP L-BAND RADAR
Spatial Extent

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

Spatial Resolution
3 Kilometers x 3 Kilometers
Location
NORTHERN HEMISPHERE
Coordinate System
CARTESIAN
Granule Spatial Representation
CARTESIAN
Temporal Extent
2015-04-13 to 2015-07-07
Temporal Resolution
1 Day
Concept ID
C2872765715-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., McDonald, K., Podest, E., Njoku, E., Kimball, J., & Kim, Y. (2015). SMAP L3 Radar Northern Hemisphere Daily 3 km EASE-Grid Freeze/Thaw State, Version 2 [Dataset]. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/GO4QPNEM0BKF Date Accessed: 2026-06-17

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