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Description

SMAP Level-4 (L4) surface and root zone soil moisture data are provided in three products: (1) SMAP L4 9 km EASE-Grid Surface and Root Zone Soil Moisture Geophysical Data (SPL4SMGP). (2) SMAP L4 9 km EASE-Grid Surface and Root Zone Soil Moisture Analysis Update (SPL4SMAU). (3) SMAP L4 9 km EASE-Grid Surface and Root Zone Soil Moisture Land Model Constants (SPL4SMLM).

For each product, SMAP L-band brightness temperature data from descending and ascending half-orbit satellite passes (approximately 6:00 a.m. and 6:00 p.m. local solar time, respectively) are assimilated into a land surface model that is gridded using an Earth-fixed, global, cylindrical 9 km Equal-Area Scalable Earth Grid, Version 2.0 (EASE-Grid 2.0) projection.

Version Description

Changes to this version include: (1) Transitioned to Validated-Stage 2. (2) Using updated SPL1CTB V3 Validated data as input. (3) Minor bug fixes.

Product Summary

Platforms
SMAP
Instruments
SMAP L-BAND RADAR
Spatial Extent

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

Spatial Resolution
9 Kilometers x 9 Kilometers
Location
GLOBAL LAND
Coordinate System
CARTESIAN
Granule Spatial Representation
CARTESIAN
Temporal Extent
2015-03-31 to 2017-07-15
Temporal Resolution
3 Hour
Concept ID
C4114263496-NSIDC_CPRD
Data State
DEPRECATED
Number of Files/Granules
0
Processing Level
4
Published
Updated
Science Keywords
Root Zone Soil Moisture ,
Surface Soil Moisture

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

Reichle, R., De Lannoy, G., Koster, R., Crow, W., & Kimball, J. (2016). SMAP L4 9 km EASE-Grid Surface and Root Zone Soil Moisture Geophysical Data, Version 2 [Data set]. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/YK70EPDHNF0L Date Accessed: 2026-06-15

Documents

Publications Citing This Dataset

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Title Year Author Topic
The application of satellite sensors, current state of utilization, and sources of remote sensing dataset in hydrology for water resource management Abegeja, Daniel Brightness Temperature, Microwave Imagery, Soil Moisture/Water Content, Vegetation Water Content, Root Zone Soil Moisture, Surface Soil Moisture
Characterizing permafrost active layer dynamics and sensitivity to landscape spatial heterogeneity in Alaska Yi, Yonghong, Kimball, John S., Chen, Richard H., Moghaddam, Mahta, Reichle, Rolf H., Mishra, Umakant, Zona, Donatella, Oechel, Walter C. Land Surface Temperature, Emissivity, Root Zone Soil Moisture, Surface Soil Moisture
Exploiting Soil Moisture, Precipitation, and Streamflow Observations to Crow, W. T., Chen, F., Reichle, R. H., Xia, Y., Liu, Q. Surface Pressure, Longwave Radiation, Shortwave Radiation, Surface Temperature, Evaporation, Humidity, Convection, Surface Winds, Rain, Land Surface Temperature, Heat Flux, Evapotranspiration, Snow, Canopy Characteristics, Leaf Characteristics, Vegetation Cover, Soil Moisture/Water Content, Soil Temperature, Albedo, Snow Water Equivalent, Runoff, Root Zone Soil Moisture, Surface Soil Moisture
Advancements in satellite remote sensing for drought monitoring Wardlow, Brian, Anderson, Martha, Hain, Christopher, Crow, Wade, Otkin, Jason, Tadesse, Tsegaye, AghaKouchak, Amir Root Zone Soil Moisture, Surface Soil Moisture
Advancements in satellite remote sensing for drought monitoring Wilhite, Donald A., Pulwarty, Roger S. Root Zone Soil Moisture, Surface Soil Moisture
Assessment of the SMAP level-4 surface and root-zone soil moisture product using in situ measurements Reichle, Rolf H., De Lannoy, Gabrielle J. M., Liu, Qing, Ardizzone, Joseph V., Colliander, Andreas, Conaty, Austin, Crow, Wade, Jackson, Thomas J., Jones, Lucas A., Kimball, John S., Koster, Randal D., Mahanama, Sarith P., Smith, Edmond B., Berg, Aaron, Bircher, Simone, Bosch, David, Caldwell, Todd G., Cosh, Michael, Gonzalez-Zamora, Angel, Holifield Collins, Chandra D., Jensen, Karsten H., Livingston, Stan, Lopez-Baeza, Ernesto, Martinez-Fernandez, Jose, McNairn, Heather, Moghaddam, Mahta, Pacheco, Anna, Pellarin, Thierry, Prueger, John, Rowlandson, Tracy, Seyfried, Mark, Starks, Patrick, Su, Zhongbo, Thibeault, Marc, van der Velde, Rogier, Walker, Jeffrey, Wu, Xiaoling, Zeng, Yijian Brightness Temperature, Soil Classification, Soil Depth, Soil Porosity, Soil Texture, Terrain Elevation, Root Zone Soil Moisture, Surface Soil Moisture
L band microwave remote sensing and land data assimilation improve the Crow, W. T., Chen, F., Reichle, R. H., Liu, Q. Root Zone Soil Moisture, Surface Soil Moisture, Brightness Temperature, Soil Moisture/Water Content
Global assessment of the SMAP Level-4 surface and root-zone soil moisture product using assimilation diagnostics Reichle, Rolf H., De Lannoy, Gabrielle J. M., Liu, Qing, Koster, Randal D., Kimball, John S., Crow, Wade T., Ardizzone, Joseph V., Chakraborty, Purnendu, Collins, Douglas W., Conaty, Austin L., Girotto, Manuela, Jones, Lucas A., Kolassa, Jana, Lievens, Hans, Lucchesi, Robert A., Smith, Edmond B. Brightness Temperature, Soil Classification, Soil Depth, Soil Porosity, Soil Texture, Terrain Elevation, Root Zone Soil Moisture, Surface Soil Moisture
SMAP radar receiver measures land surface freeze/thaw state through capture of forward-scattered L-band signals Chew, Clara, Lowe, Stephen, Parazoo, Nicholas, Esterhuizen, Stephan, Oveisgharan, Shadi, Podest, Erika, Zuffada, Cinzia, Freedman, Adam Freeze/Thaw, SIGMA NAUGHT, Transition Direction, Brightness Temperature, Soil Moisture/Water Content, Root Zone Soil Moisture, Surface Soil Moisture
Retrieving landscape freeze/thaw state from Soil Moisture Active Passive (SMAP) radar and radiometer measurements Derksen, Chris, Xu, Xiaolan, Scott Dunbar, R., Colliander, Andreas, Kim, Youngwook, Kimball, John S., Black, T. Andrew, Euskirchen, Eugenie, Langlois, Alexandre, Loranty, Michael M., Marsh, Philip, Rautiainen, Kimmo, Roy, Alexandre, Royer, Alain, Stephens, Jilmarie Freeze/Thaw, SIGMA NAUGHT, Transition Direction, Soil Moisture/Water Content, ORBITAL CHARACTERISTICS, RADAR IMAGERY, Brightness Temperature, Root Zone Soil Moisture, Surface Soil Moisture, Freeze/Thaw
The SMAP Level 4 Carbon Product for Monitoring Ecosystem LandAtmosphere CO2 Exchange Jones, Lucas A., Kimball, John S., Reichle, Rolf H., Madani, Nima, Glassy, Joe, Ardizzone, Joe V., Colliander, Andreas, Cleverly, James, Desai, Ankur R., Eamus, Derek, Euskirchen, Eugenie S., Hutley, Lindsay, Macfarlane, Craig, Scott, Russell L. Carbon, Nitrogen, Soil Water Holding Capacity, Soil Bulk Density, Soil Chemistry, Soil Classification, Soil Moisture/Water Content, Soil Horizons/Profile, Soil Depth, Soil Porosity, Soil Texture, Terrain Elevation, Root Zone Soil Moisture, Surface Soil Moisture, Gross Primary Production (gpp), Heterotrophic Respiration (rh), NET ECOSYSTEM CO2 EXCHANGE (NEE), Soil Organic Carbon (SOC)
The SMAP level 4 carbon product for monitoring terrestrial ecosystem-atmosphere CO2 exchange Jones, L. A., Kimball, J. S., Madani, N., Reichle, R. H., Glassy, J., Ardizzone, J. Carbon, Nitrogen, Soil Water Holding Capacity, Soil Bulk Density, Soil Chemistry, Soil Classification, Soil Moisture/Water Content, Soil Horizons/Profile, Root Zone Soil Moisture, Surface Soil Moisture, Gross Primary Production (gpp), Heterotrophic Respiration (rh), NET ECOSYSTEM CO2 EXCHANGE (NEE), Soil Organic Carbon (SOC)
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