N: 85.044 S: -85.044 E: 180 W: -180
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Description
This Level-3 (L3) soil moisture product provides a composite of daily estimates of global land surface conditions retrieved by the Soil Moisture Active Passive (SMAP) passive microwave radiometer. SMAP L-band soil moisture data are resampled to a global, cylindrical 36 km Equal-Area Scalable Earth Grid, Version 2.0 (EASE-Grid 2.0).
Version Description
Changes to this version include: (1) Level-1B water-corrected brightness temperatures are used in passive soil moisture retrieval. This procedure corrects for anomalous soil moisture values seen near coastlines in the previous version and should result in less rejected data due to waterbody contamination. Five new data fields accommodate this correction: grid_surface_status, surface_water_fraction_mb_h, surface_water_fraction_mb_v, tb_h_uncorrected, and tb_v_uncorrected. (2) Improved depth correction for effective soil temperature used in passive soil moisture retrieval; new results are captured in the surface_temperature data field. This correction reduces the dry bias seen when comparing SMAP data to in situ data from the core validation sites. (3) Frozen ground flag updated to reflect improved freeze/thaw detection algorithm, providing better accuracy; new results are captured in bit 7 of surface_flag.
Product Summary
Platforms
Instruments
Spatial Extent
Spatial Resolution
36 Kilometers x 36 Kilometers
Spatial Reference System(s)
WGS 84 / NSIDC EASE-Grid 2.0 Global (EPSG:6933)
Location
GLOBAL LAND
Coordinate System
CARTESIAN
Granule Spatial Representation
CARTESIAN
Temporal Extent
2015-03-31 to 2019-08-12
Temporal Resolution
1 Day
Concept ID
C4112448361-NSIDC_CPRD
Data State
DEPRECATED
Number of Files/Granules
0
Processing Level
3
Published
Updated
Science Keywords
Brightness Temperature
,
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.
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ONeill, P., Chan, S., Njoku, E., Jackson, T., & Bindlish, R. (2018). SMAP L3 Radiometer Global Daily 36 km EASE-Grid Soil Moisture, Version 5 [Dataset]. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/ZX7YX2Y2LHEB Date Accessed: 2026-10-05
@misc{oneill_chan_njoku_jackson_bindlish_2018,
title={SMAP L3 Radiometer Global Daily 36 km EASE-Grid Soil Moisture, Version 5},
url={http://nsidc.org/data/SPL3SMP/versions/5},
DOI={10.5067/ZX7YX2Y2LHEB},
publisher={NASA National Snow and Ice Data Center Distributed Active Archive Center},
author={ONeill, Peggy and Chan, Steven and Njoku, Eni and Jackson, Thomas and Bindlish, Rajat},
year={2018},
}
ONeill, P., Chan, S., Njoku, E., Jackson, T., & Bindlish, R. (2018). SMAP L3 Radiometer Global Daily 36 km EASE-Grid Soil Moisture, Version 5 [Dataset]. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/ZX7YX2Y2LHEB Date Accessed: 2026-10-05
ONeill, Peggy, et al. “SMAP L3 Radiometer Global Daily 36 Km EASE-Grid Soil Moisture, Version 5.” NASA National Snow and Ice Data Center Distributed Active Archive Center, 2018, https://doi.org/10.5067/ZX7YX2Y2LHEB. Date Accessed: 2026-10-05
TABLE OF CONTENTS
Documents
ALGORITHM THEORETICAL BASIS DOCUMENT (ATBD)
DATA PRODUCT SPECIFICATION
PRODUCT QUALITY ASSESSMENT
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