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Description

This Level-3 (L3) soil moisture product provides a daily composite of global land surface conditions retrieved by both the Soil Moisture Active Passive (SMAP) radar and radiometer. SMAP L-band soil moisture data are resampled to an Earth-fixed, global, cylindrical 9 km Equal-Area Scalable Earth Grid, Version 2.0 (EASE-Grid 2.0).

Version Description

Changes to this version include:
  • Transitioned to Validated-Stage 2
  • Using SPL2SMAP V3 Validated data as input
For the full major and minor version history, go to https://nsidc.org/data/smap/version-history

Product Summary

Platforms
SMAP
Instruments
SMAP L-BAND RADAR ,
SMAP L-BAND RADIOMETER
Spatial Extent

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

Spatial Resolution
9 Kilometers x 9 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
2015-04-13 to 2015-07-07
Temporal Resolution
1 Day
Concept ID
C2872767144-NSIDC_CPRD
Data State
COMPLETE
Number of Files/Granules
84
Processing Level
3
Published
Science Keywords
Brightness Temperature ,
SIGMA NAUGHT ,
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

Entekhabi, D., Das, N., Njoku, E., Johnson, J., & Shi, J. (2016). SMAP L3 Radar/Radiometer Global Daily 9 km EASE-Grid Soil Moisture, Version 3 [Data set]. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/7KKNQ5UURM2W Date Accessed: 2026-05-04

Documents

Publications Citing This Dataset

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Title Year Author Topic
How Does Assimilating SMAP Soil Moisture Improve Characterization of the Terrestrial Water Cycle in an Integrated Land Surface-Subsurface Model? Zhao, Haojin, Montzka, Carsten, Keller, Johannes, Li, Fang, Vereecken, Harry, Hendricks Franssen, HarrieJan Brightness Temperature, SIGMA NAUGHT, Soil Moisture/Water Content
Soil moisture gradients strengthen intense thunderstorms Brightness Temperature, SIGMA NAUGHT, Soil Moisture/Water Content
Soil moisture gradients strengthen mesoscale convective systems by increasing wind shear Barton, Emma J., Klein, Cornelia, Taylor, Christopher M., Marsham, John, Parker, Douglas J., Maybee, Ben, Feng, Zhe, Leung, L. Ruby Brightness Temperature, SIGMA NAUGHT, Soil Moisture/Water Content
Multi-Decadal Soil Moisture and Crop Yield VariabilityA Case Study With the Community Land Model (CLM5) Boas, Theresa, Bogena, Heye, Ryu, Dongryeol, Western, Andrew, Hendricks Franssen, HarrieJan Brightness Temperature, SIGMA NAUGHT, Soil Moisture/Water Content
Forward and backward full-pol scattering analysis using SMAP reflectometer and radar datasets Perez-Portero, Adrian, Munoz-Martin, Joan Francesc, Rodriguez-Alvarez, Nereida, Bosch-Lluis, Xavier, Oudrhiri, Kamal Vegetation Index, Normalized Difference Vegetation Index (NDVI), Enhanced Vegetation Index (EVI), Brightness Temperature, SIGMA NAUGHT, Soil Moisture/Water Content
Estimating Backward Scattering using GNSS-Reflectometry Measurements for Soil Moisture Retrieval Perez-Portero, Adrian, Rodriguez-Alvarez, Nereida, Francesc Munoz-Martin, Joan, Bosch-Lluis, Xavier, Oudrhiri, Kamal Vegetation Index, Normalized Difference Vegetation Index (NDVI), Enhanced Vegetation Index (EVI), Brightness Temperature, SIGMA NAUGHT, Soil Moisture/Water Content
Diurnal Vegetation Moisture Cycle in the Amazon and Response to Water Asgarimehr, Milad, Entekhabi, Dara, Camps, Adriano Brightness Temperature, SIGMA NAUGHT, Soil Moisture/Water Content, Radar Cross-Section, Radar Reflectivity, Precipitation, Precipitation Amount, Precipitation Rate, Snow, Rain
Evaluation of SMAP and CYGNSS Soil Moistures in Drought Prediction Using Multiple Linear Regression and GLDAS Product Edokossi, Komi, Jin, Shuanggen, Calabia, Andres, Molina, Inigo, Mazhar, Usman 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, Total Surface Precipitation Rate, Brightness Temperature, SIGMA NAUGHT
A novel land surface temperature reconstruction method and its application for downscaling surface soil moisture with machine learning Gungor Sahin, Onur, Gunduz, Orhan Land Surface Temperature, Emissivity, Reflectance, Vegetation Index, Normalized Difference Vegetation Index (NDVI), Plant Phenology, Enhanced Vegetation Index (EVI), Brightness Temperature, SIGMA NAUGHT, Soil Moisture/Water Content
Deducing land-atmosphere coupling regimes from SMAP soil moisture Makhasana, Payal R., Santanello, Joseph A., Lawston-Parker, Patricia M., Roundy, Joshua K. Carbon Monoxide, Geopotential Height, Tropopause, Methane, Atmospheric Ozone, Surface Pressure, Outgoing Longwave Radiation, Air Temperature, Upper Air Temperature, Humidity, Total Precipitable Water, Water Vapor, Water Vapor Profiles, Cloud Liquid Water/Ice, Cloud Height, Cloud Top Pressure, Cloud Top Temperature, Cloud Vertical Distribution, Emissivity, Skin Temperature, Sea Surface Temperature, Altitude, Surface Temperature, Skin Temperature, Dew Point Temperature, Atmospheric Winds, Surface Winds, U/V Wind Components, Upper Level Winds, U/V Wind Components, Vertical Wind Velocity/Speed, Atmospheric Pressure, Sea Level Pressure, Sea Level Pressure, Specific Humidity, Atmospheric Water Vapor, Oxygen Compounds, Boundary Layer Winds, Total Ozone, Brightness Temperature, SIGMA NAUGHT, Soil Moisture/Water Content
Understanding Terrestrial Water and Carbon Cycles and Their Interactions Cao, Zhijiong, Xue, Yongkang, Nayak, Hara Prasad, Lettenmaier, Dennis P., Frankenberg, Christian, Kohler, Philipp, Li, Ziwei Atmospheric Carbon Dioxide, Solar Induced Fluorescence, Brightness Temperature, SIGMA NAUGHT, Soil Moisture/Water Content
NASA's NMME-based S2S Hydrologic Forecast System for Food Insecurity Early Warning in Southern Africa Hazra, Abheera, McNally, Amy, Slinski, Kimberly, Arsenault, Kristi R., Shukla, Shraddhanand, Getirana, Augusto, Jacob, Jossy P., Sarmiento, Daniel P., Peters-Lidard, Christa, Kumar, Sujay V., Koster, Randal D. Plant Phenology, Vegetation Index, Brightness Temperature, SIGMA NAUGHT, Soil Moisture/Water Content
Coccidioides undetected in soils from agricultural land and uncorrelated with time or the greater soil fungal community on undeveloped land Wagner, Robert, Montoya, Liliam, Head, Jennifer R., Campo, Simon, Remais, Justin, Taylor, John W. Vegetation Index, Normalized Difference Vegetation Index (NDVI), Enhanced Vegetation Index (EVI), Brightness Temperature, SIGMA NAUGHT, Soil Moisture/Water Content
Assessment of Surface Fractional Water Impacts on SMAP Soil Moisture Retrieval Du, Jinyang, Kimball, John S., Chan, Steven K., Chaubell, Mario Julian, Bindlish, Rajat, Dunbar, R. Scott, Colliander, Andreas Brightness Temperature, SIGMA NAUGHT, Soil Moisture/Water Content
Analysis of signal-to-noise ratio retrieved from multi-GNSS satellite data of land surface reflections Liu, Qi, Li, Weiqiang, Zhang, Shuangcheng, Nan, Yang, Peng, Jilun, Ma, Zhongmin Brightness Temperature, SIGMA NAUGHT, Soil Moisture/Water Content
Seasonal soil moisture and crop yield prediction with fifth-generation seasonal forecasting system (SEAS5) long-range meteorological forecasts in a land ... Boas, Theresa, Bogena, Heye Reemt, Ryu, Dongryeol, Vereecken, Harry, Western, Andrew, Hendricks Franssen, Harrie-Jan Evapotranspiration, Latent Heat Flux, Leaf Area Index (LAI), Fraction Of Absorbed Photosynthetically Active Radiation (fapar), Terrain Elevation, Digital Elevation/Terrain Model (DEM), Topographical Relief Maps, Land Use/Land Cover Classification, Brightness Temperature, SIGMA NAUGHT, Soil Moisture/Water Content
Using Robust Regression to Retrieve Soil Moisture from CyGNSS Data Liu, Qi, Zhang, Shuangcheng, Li, Weiqiang, Nan, Yang, Peng, Jilun, Ma, Zhongmin, Zhou, Xin Brightness Temperature, SIGMA NAUGHT, Soil Moisture/Water Content, Soil Temperature
A Central Asia hydrologic monitoring dataset for food and water security applications in Afghanistan McNally, Amy, Jacob, Jossy, Arsenault, Kristi, Slinski, Kimberly, Sarmiento, Daniel P., Hoell, Andrew, Pervez, Shahriar, Rowland, James, Budde, Mike, Kumar, Sujay, Peters-Lidard, Christa, Verdin, James P. Surface Pressure, Heat Flux, Longwave Radiation, Shortwave Radiation, Air Temperature, Specific Humidity, Evapotranspiration, Wind Speed, Rain, Snow, Soil Moisture/Water Content, Soil Temperature, Land Surface Temperature, Snow Cover, Snow Depth, Snow Water Equivalent, Runoff, RADAR IMAGERY, Terrain Elevation, Topographical Relief Maps, Digital Elevation/Terrain Model (DEM), Reflectance, Total Surface Water, Brightness Temperature, SIGMA NAUGHT, Precipitation, Precipitation Amount, Precipitation Rate
Validation of NASA SMAP Satellite Soil Moisture Products over the Desert AlJassar, Hala, Temimi, Marouane, Abdelkader, Mohamed, Petrov, Peter, Kokkalis, Panagiotis, AlSarraf, Hussain, Roshni, Nair, Hendi, Hamad Al Brightness Temperature, SIGMA NAUGHT, Soil Moisture/Water Content
Assimilating satellite-based soil moisture observations in a land surface model: The effect of spatial resolution Rouf, Tasnuva, Girotto, Manuela, Houser, Paul, Maggioni, Viviana Brightness Temperature, SIGMA NAUGHT, Soil Moisture/Water Content
On the Relationship Between Radar Backscatter and Radiometer Brightness Temperature From SMAP Zeng, Jiangyuan, Shi, Pengfei, Chen, Kun-Shan, Ma, Hongliang, Bi, Haiyun, Cui, Chenyang Brightness Temperature, SIGMA NAUGHT, Soil Moisture/Water Content
Improved Understanding of the Link Between Catchment-Scale Vegetation Accessible Storage and Satellite-Derived Soil Water Index Bouaziz, Laurene J. E., SteeleDunne, Susan C., Schellekens, Jaap, Weerts, Albrecht H., Stam, Jasper, Sprokkereef, Eric, Winsemius, Hessel H. C., Savenije, Hubert H. G., Hrachowitz, Markus Brightness Temperature, SIGMA NAUGHT, Soil Moisture/Water Content
Improving SMAP freeze-thaw retrievals for pavements using effective soil temperature from GEOS-5: Evaluation against in situ road temperature data over the US Kraatz, Simon, Jacobs, Jennifer M., Schroder, Ronny, Cho, Eunsang, Miller, Heather J., Vuyovich, Carrie M. Brightness Temperature, SIGMA NAUGHT, Soil Moisture/Water Content
Gap filling of highresolution soil moisture for SMAP/sentinel1: a twolayer machine learningbased framework Mao, Hanzi, Kathuria, Dhruva, Duffield, Nick, Mohanty, Binayak P. Land Use/Land Cover Classification, RADAR IMAGERY, Terrain Elevation, Digital Elevation/Terrain Model (DEM), Land Surface Temperature, Emissivity, Leaf Characteristics, Photosynthetically Active Radiation, Leaf Area Index (LAI), Fraction Of Absorbed Photosynthetically Active Radiation (fapar), Brightness Temperature, SIGMA NAUGHT, Soil Moisture/Water Content
Analysis of the Radar Vegetation Index and Potential Improvements Szigarski, Christoph, Jagdhuber, Thomas, Baur, Martin, Thiel, Christian, Parrens, Marie, Wigneron, Jean-Pierre, Piles, Maria, Entekhabi, Dara Brightness Temperature, SIGMA NAUGHT, Soil Moisture/Water Content
Soil moisture retrieval from SMAP: a validation and error analysis study using ground-based observations over the little Washita watershed Chen, Quan, Zeng, Jiangyuan, Cui, Chenyang, Li, Zhen, Chen, Kun-Shan, Bai, Xiaojing, Xu, Jia Brightness Temperature, SIGMA NAUGHT, Soil Moisture/Water Content
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