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Description

This Level-3 (L3) product provides a daily 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. SMAP L-band backscatter data are used to derive freeze/thaw data, which are then resampled to an Earth-fixed, Northern Hemisphere azimuthal 3 km Equal-Area Scalable Earth Grid, Version 2.0 (EASE-Grid 2.0).

Product Summary

Platforms
SMAP
Instruments
SMAP L-BAND RADAR
Spatial Extent

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

Spatial Resolution
3 Kilometers x 3 Kilometers
Geographic Region
NORTHERN HEMISPHERE
Coordinate System
CARTESIAN
Granule Spatial Representation
CARTESIAN
Temporal Extent
2015-04-13 to 2015-07-07
Concept ID
C2872766057-NSIDC_CPRD
Data State
COMPLETE
Number of Files/Granules
84
Processing Level
3
Published
Science Keywords
Freeze/Thaw ,
SIGMA NAUGHT ,
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. (2016). SMAP L3 Radar Northern Hemisphere Daily 3 km EASE-Grid Freeze/Thaw State, Version 3 [Data set]. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/CPSA0M496MGB Date Accessed: 2025-12-14

Documents

USER'S GUIDE

GENERAL DOCUMENTATION