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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: - Dual Channel Algorithm (DCA) replaces Single Channel Algorithm – Vertical (SCA-V) as baseline algorithm - Bulk_density maximum value changed from 1 to 2.65

Product Summary

Platforms
SMAP
Instruments
SMAP L-BAND RADIOMETER
Spatial Extent

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

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 2023-12-02
Temporal Resolution
1 Day
Concept ID
C2872802330-NSIDC_CPRD
Data State
DEPRECATED
Number of Files/Granules
0
Processing Level
3
Published
Science Keywords
Brightness Temperature ,
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

ONeill, P., Chan, S., Njoku, E., Jackson, T., Bindlish, R., & Chaubell, J. (2021). SMAP L3 Radiometer Global Daily 36 km EASE-Grid Soil Moisture, Version 8 [Dataset]. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/OMHVSRGFX38O Date Accessed: 2026-07-23

Documents

Publications Citing This Dataset

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Title Year Author Topic
A Hybrid Physics-Guided Machine Learning for Soil Moisture Monitoring and Drought Assessment From CYGNSS in Complex Terrain Rhadiouini, Charafa El, Jin, Shuanggen, Yeboah, Emmanuel, Sarfo, Isaac, Okrah, Abraham 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, RADAR IMAGERY, Terrain Elevation, Topographical Relief Maps, Digital Elevation/Terrain Model (DEM), Vegetation Index, Normalized Difference Vegetation Index (NDVI), Enhanced Vegetation Index (EVI), Brightness Temperature, Surface Soil Moisture, Radar Cross-Section, Radar Reflectivity
An operational global L-band soil moisture and vegetation optical depth dataset from optimized 40 SMOS brightness temperatures for 20102024 Xing, Zanpin, Li, Xiaojun, Frappart, Frederic, De Lannoy, Gabrielle, Jagdhuber, Thomas, Peng, Jian, Fan, Lei, Ma, Hongliang, Karthikeyan, Lanka, Liu, Xiangzhuo, Wang, Mengjia, Zhao, Lin, Liu, Yongqin, Wigneron, Jean-Pierre Land Use/Land Cover Classification, Vegetation Index, Normalized Difference Vegetation Index (NDVI), Enhanced Vegetation Index (EVI), Plant Phenology, Brightness Temperature, Surface Soil Moisture
Improving Global Surface Soil Moisture Prediction Through PhysicsGuided Deep Learning and ClusterBased Regionalization Xi, Xuan, Zhuang, Qianlai Brightness Temperature, Surface Soil Moisture
National Oceanic and Atmospheric Administration Soil Moisture Operational Product System: An overview and data assimilation applications Yin, Jifu, Zhan, Xiwu, Liu, Jicheng, Kim, Jong, Jeon, ChanHoo, Petro, Gillian Brightness Temperature, Surface Soil Moisture
A Hybrid Approach for Soil Moisture Upscaling Based on Dense Monitoring With Consideration of Heterogeneity Guo, Shitong, Guo, Ge, He, Xiurong, Liu, Shaomin, Chai, Linna, Zhao, Tianjie, Zhu, Zhongli, Xu, Ziwei Brightness Temperature, Surface Soil Moisture
Benchmarking and evaluating the NASA Land Information System (version He, Cenlin, Lin, Tzu-Shun, Mocko, David M., Abolafia-Rosenzweig, Ronnie, Wegiel, Jerry W., Kumar, Sujay V. Albedo, Anisotropy, Brightness Temperature, Surface Soil Moisture, Albedo, Snow Cover
Assimilation of ASCAT Soil Moisture and SMAP Brightness Temperature Observations into the NASA GEOS Land Data Assimilation System Fox, Andrew M., Reichle, Rolf H., Liu, Qing Brightness Temperature, Surface Soil Moisture
Assessing the capability of Triton GNSS-Reflectometry for land surface hydrological monitoring Setti, Paulo T., Tabibi, Sajad Radar Cross-Section, Radar Reflectivity, SIGMA NAUGHT, Flight Data Logs, Total Surface Water, Brightness Temperature, Surface Soil Moisture
Real-time estimation of SMAP soil moisture in mountainous areas and its impact on rainfall-runoff simulation An, Huicong, Ouyang, Chaojun, Chen, Xiaoqing Brightness Temperature, Surface Soil Moisture
Refined semi-empirical models for soil moisture retrieval in spaceborne Dong, Zhounan, Yan, Qingyun, Jin, Shuanggen, Li, Li, Chen, Guodong Land Use/Land Cover Classification, Brightness Temperature, Surface Soil Moisture
Reprocessed NOAA SMOPS Blended Soil Moisture Product as a Climate Data Record Yin, Jifu, Zhan, Xiwu, Liu, Jicheng, Barlage, Michael, Meng, Huan, Kalluri, Satya, Yang, John Xun, Ogden, Fred L., Goldberg, Mitchell D., Zhao, Limin, Cosh, Michael, Ferraro, Ralph R. Brightness Temperature, Surface Soil Moisture
Analysis of hydrological time-lag effects using multiple GNSS techniques: GNSS-R-retrieved soil moisture, GNSS-derived coordinates, and GNSS-based water vapor ... Yong, Weiao, Wang, Xiaolei, Tu, Jinsheng, Gao, Ying Brightness Temperature, Surface Soil Moisture
A parametric approach for global estimation of forest above-ground biomass with SMOS and SMAP L-band radiometer data Cartus, Oliver, Santoro, Maurizio, Jimenez, Carlos, Prigent, Catherine, Schwank, Mike, Wegmuller, Urs Brightness Temperature, Surface Soil Moisture
An Algorithm for Downscaling SMAP Soil Moisture to 3 km Using CYGNSS Observations Zhu, Yifan, Guo, Fei, Yang, Wentao, Zhang, Zhiyu, Li, Zheng, Wu, Ziheng, Zhang, Xiaohong Brightness Temperature, Surface Soil Moisture, Soil Moisture/Water Content
Lightning density and its coupled covariates within the Continental United States Eisenacher, Steffen, Fluhrer, Anke, Bliefernicht, Jan, Short Gianotti, Daniel J., Kunstmann, Harald, Jagdhuber, Thomas Brightness Temperature, Surface Soil Moisture
Nonlinear Soil Moisture Loss Function Reveals Vegetation Responses to Water Availability Araki, Ryoko, Morgan, Bryn E., McMillan, Hilary K., Caylor, Kelly K. Digital Elevation/Terrain Model (DEM), Land Use/Land Cover Classification, Normalized Difference Vegetation Index (NDVI), Soil Classification, Soil Texture, Surface Roughness, Brightness Temperature, Surface Soil Moisture, Root Zone Soil Moisture
Spatio-temporal dynamics of L-band zeroth-order vegetation scattering albedo from SMAP observations in tropical forests Liu, Yuqing, Li, Xiaojun, Ciais, Philippe, Frappart, Frederic, Liu, Xiangzhuo, G. Cosio, Eric, Zheng, Yi, Xing, Zanpin, Wang, Huan, Fan, Lei, Chaubell, Mario Julian, Wigneron, Jean-Pierre Brightness Temperature, Surface Soil Moisture
Two-stage downscaling and correction cascade learning framework for Li, Jie, Wei, Yingtao, Lin, Liupeng, Yuan, Qiangqiang, Shen, Huanfeng Brightness Temperature, Surface Soil Moisture, Vegetation Index, Normalized Difference Vegetation Index (NDVI), Enhanced Vegetation Index (EVI), Land Surface Temperature, Emissivity, Precipitation, Precipitation Amount, Precipitation Rate, Snow, Rain, Albedo, Anisotropy
Value of microwave soil moisture and thermal-infrared evapotranspiration retrievals for the mapping of irrigation coverage Crow, Wade T., Anderson, Martha C., Volk, John M., Colliander, Andreas Brightness Temperature, Surface Soil Moisture
Vegetation signal crosstalk present in official SMAP surface soil Crow, Wade T., Feldman, Andrew F. Land Use/Land Cover Classification, Vegetation Index, Normalized Difference Vegetation Index (NDVI), Enhanced Vegetation Index (EVI), Brightness Temperature, Surface Soil Moisture, Root Zone Soil Moisture
A first evaluation of satellite soil moisture products over the Central-Western Tibetan Plateau using rain gauge observations Huang, Cheng, Zhao, Long, Chen, Yingying, Chen, Jinyan, Yang, Kun Brightness Temperature, Surface Soil Moisture
Comprehensive Analysis of CYGNSS GNSS-R data for Enhanced Soil Moisture Retrieval Setti, Paulo, Tabibi, Sajad Radar Cross-Section, Radar Reflectivity, Radar Cross-Section, Radar Reflectivity, Soil Temperature, Soil Moisture/Water Content, SIGMA NAUGHT, Flight Data Logs, Brightness Temperature, Surface Soil Moisture
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, Surface Soil Moisture
Retrieval and evaluation of surface soil moisture from CYGNSS using blended microwave soil moisture products Dong, Zhounan, Jin, Shuanggen, Li, Li, Wang, Peng Brightness Temperature, Surface Soil Moisture
Preferential Hydrologic States and Tipping Characteristics of Global Surface Soil Moisture Sehgal, Vinit, Mohanty, Binayak P. Brightness Temperature, Surface Soil Moisture, Soil Moisture/Water Content
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