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Description

This enhanced 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) radiometer. This product is a daily composite of SMAP Level-2 (L2) soil moisture which 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 global cylindrical projection.

Version Description

First public data release

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 2018-06-03
Temporal Resolution
1 Day
Concept ID
C4112453180-NSIDC_CPRD
Data State
DEPRECATED
Number of Files/Granules
0
Processing Level
3
Published
Updated
Science Keywords
Brightness Temperature ,
Soil Moisture/Water Content

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

ONeill, P., Chan, S., Njoku, E., Jackson, T., & Bindlish, R. (2016). SMAP Enhanced L3 Radiometer Global Daily 9 km EASE-Grid Soil Moisture, Version 1 [Data set]. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/ZRO7EXJ8O3XI Date Accessed: 2026-06-14

Documents

Publications Citing This Dataset

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Title Year Author Topic
Short-term satellite soil moisture for agricultural drought Palagiri, Hussain, Pal, Manali, Maity, Rajib Surface Pressure, Heat Flux, Longwave Radiation, Shortwave Radiation, Surface Temperature, Humidity, Evapotranspiration, Surface Winds, Rain, Precipitation Rate, Snow, Soil Moisture/Water Content, Soil Temperature, Land Surface Temperature, Snow Water Equivalent, Runoff, Brightness Temperature
Integration of Sentinel-1A Radar and SMAP Radiometer for Soil Moisture Arab, Saeed, Easson, Greg, Ghaffari, Zahra Brightness Temperature, Soil Moisture/Water Content
Modelling forest road trafficability with satellite-based soil moisture Fjeld, Dag, Persson, Magnus, Fransson, Johan E.S., Bjerketvedt, Jan, Brathen, Martin Brightness Temperature, Soil Moisture/Water Content
Diagnosing Product Variability in the Soil Moisture Response to Precipitation on the Tibetan Plateau Meng, X., Deng, M., Talib, J., Taylor, C. M., Wu, P., Lyu, S., Chen, H., Li, Z., Zhao, L. Brightness Temperature, Soil Moisture/Water Content
Drought Monitoring Using Satellite Soil Moisture Data Over Godavari Basin, India Palagiri, Hussain, Pal, Manali, Maity, Rajib Surface Pressure, Heat Flux, Longwave Radiation, Shortwave Radiation, Surface Temperature, Humidity, Evapotranspiration, Surface Winds, Rain, Precipitation Rate, Snow, Soil Moisture/Water Content, Soil Temperature, Land Surface Temperature, Snow Water Equivalent, Runoff, Brightness Temperature
Soil MoistureVegetation StressBased Agricultural Drought Index Integrating Remote SensingDerived Soil Moisture and Vegetation Indices Singh, Gurjeet, Bisht, Deepak Singh Brightness Temperature, Soil Moisture/Water Content
An Examination of the SMAP Operational Soil Moisture Products Accuracy Deng, Khidir Abdalla Kwal, Petropoulos, George P., Bao, Yansong, Pavlides, Andrew, Saidou Chaibou, Abdoul Aziz, Habtemicheal, Birhanu Asmerom Brightness Temperature, Soil Moisture/Water Content
Detecting and mapping irrigated areas in a Mediterranean environment by using remote sensing soil moisture and a land surface model Dari, Jacopo, Quintana-Segui, Pere, Escorihuela, Maria Jose, Stefan, Vivien, Brocca, Luca, Morbidelli, Renato Brightness Temperature, Soil Moisture/Water Content
Impact of temporal variations in vegetation optical depth and vegetation Monsivais-Huertero, Alejandro, Hernandez-Sanchez, Juan Carlos, Jimenez-Escalona, Jose Carlos, Galeana-Pizana, Jose Mauricio, Constantino-Recillas, Daniel Enrique, Torres-Gomez, Aura Citlalli, Magagi, Ramata, Goita, Kalifa, Couturier, Stephane Brightness Temperature, Soil Moisture/Water Content
An in-situ data based model to downscale radiometric satellite soil moisture products in the Upper Hunter Region of NSW, Australia Senanayake, I.P., Yeo, I.-Y., Tangdamrongsub, N., Willgoose, G.R., Hancock, G.R., Wells, T., Fang, B., Lakshmi, V., Walker, J.P. Land Surface Temperature, Emissivity, Vegetation Index, Normalized Difference Vegetation Index (NDVI), Enhanced Vegetation Index (EVI), Brightness Temperature, Soil Moisture/Water Content
Biomass estimation over tropical rainforests using GNSS-R on-board the CyGNSS microsatellites constellation Carreno-Luengo, Hugo, Luzi, Guido, Crosetto, Michele Canopy Characteristics, Brightness Temperature, Soil Moisture/Water Content
Mapped Hydroclimatology of Evapotranspiration and Drainage Runoff Using Akbar, Ruzbeh, Short Gianotti, Daniel J., Salvucci, Guido D., Entekhabi, Dara Brightness Temperature, Soil Moisture/Water Content
Landscape Water Storage and Subsurface Correlation From Satellite Short Gianotti, Daniel J., Salvucci, Guido D., Akbar, Ruzbeh, McColl, Kaighin A., Cuenca, Richard, Entekhabi, Dara Brightness Temperature, Soil Moisture/Water Content
Soil moisture data assimilation to estimate irrigation water use AbolafiaRosenzweig, R., Livneh, B., Small, E.E., Kumar, S.V. 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, Brightness Temperature
Validation of SMAP Soil Moisture Products Using Ground-Based Singh, Gurjeet, Das, Narendra N., Panda, Rabindra K., Colliander, Andreas, Jackson, Thomas J., Mohanty, Binayak P., Entekhabi, Dara, Yueh, Simon H. Brightness Temperature, Soil Moisture/Water Content
A new paradigm in earth environmental monitoring with the cygnss small satellite constellation Ruf, Christopher S., Chew, Clara, Lang, Timothy, Morris, Mary G., Nave, Kyle, Ridley, Aaron, Balasubramaniam, Rajeswari Brightness Temperature, Soil Moisture/Water Content
Characterization of higher-order scattering from vegetation with SMAP measurements Feldman, Andrew F., Akbar, Ruzbeh, Entekhabi, Dara Soil Moisture/Water Content, Soil Temperature, Brightness Temperature
Hydrological Storage Length Scales Represented by Remote Sensing Akbar, Ruzbeh, Short Gianotti, Daniel, McColl, Kaighin A., Haghighi, Erfan, Salvucci, Guido D., Entekhabi, Dara Brightness Temperature, Soil Moisture/Water Content
Impact of the elevation angle on CYGNSS GNSS-R bistatic reflectivity as a function of effective surface roughness over land surfaces Carreno-Luengo, Hugo, Luzi, Guido, Crosetto, Michele Brightness Temperature, Soil Moisture/Water Content
Integration of microwave data from SMAP and AMSR2 for soil moisture monitoring in Italy Santi, E., Paloscia, S., Pettinato, S., Brocca, L., Ciabatta, L., Entekhabi, D. Brightness Temperature, Soil Moisture/Water Content
Estimating Soil Evaporation Using Drying Rates Determined from Small, Eric E., Badger, Andrew M., Abolafia-Rosenzweig, Ronnie, Livneh, Ben Soil Moisture/Water Content, Soil Temperature, Surface Pressure, Longwave Radiation, Shortwave Radiation, Surface Temperature, Evaporation, Humidity, Convection, Surface Winds, Rain, Land Surface Temperature, Brightness Temperature
Evaluating consistency between the remotely sensed soil moisture and the hydrological model-simulated soil moisture in the Qujiang catchment of China Xiong, Lihua, Yang, Han, Zeng, Ling, Xu, Chong-Yu Brightness Temperature, Soil Moisture/Water Content
Controls on surface soil drying rates observed by SMAP and simulated by the Noah land surface model Shellito, Peter J., Small, Eric E., Livneh, Ben Vegetation Index, Normalized Difference Vegetation Index (NDVI), Enhanced Vegetation Index (EVI), 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, Brightness Temperature
Geophysical Relationship between Cygnss GNSS-R Bistatic Reflectivity and Smap Microwave Radiometry Brightness Temperature Over Land Surfaces Carreno-Luengo, Hugo, Luzi, Guido, Crosetto, Michele Brightness Temperature, Soil Moisture/Water Content
Global downscaling of remotely sensed soil moisture using neural networks Alemohammad, Seyed Hamed, Kolassa, Jana, Prigent, Catherine, Aires, Filipe, Gentine, Pierre Vegetation Index, Normalized Difference Vegetation Index (NDVI), Enhanced Vegetation Index (EVI), Soil Temperature, Soil Moisture/Water Content, Brightness Temperature
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