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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: • An improved processing methodology was applied to the input Level-2 radiometer brightness temperatures. • The data algorithms, structure, content, or processor code are otherwise unchanged from the previous version. 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 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 Present
Temporal Resolution
1 Day
Concept ID
C2938664585-NSIDC_CPRD
Data State
ACTIVE
Number of Files/Granules
4119
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. (2023). SMAP L3 Radiometer Global Daily 36 km EASE-Grid Soil Moisture, Version 9 [Dataset]. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/4XXOGX0OOW1S Date Accessed: 2026-08-02

Documents

Publications Citing This Dataset

Filters
Title Year Author Topic
Characterization of uncertainty in ground-based validation of soil Zeng, Qicheng, Wu, Xiaodan, Wen, Jianguang, Yin, Gaofei, Lin, Xingwen, Li, Yukun, You, Dongqin, Xiao, Qing 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, Surface Soil Moisture
Ensemble numerical simulation of permafrost thermal regimes over the Tibetan Plateau using the Flexible Permafrost Model: 19502023 Sun, Wen, Cao, Bin Leaf Area Index (LAI), Fraction Of Absorbed Photosynthetically Active Radiation (fapar), Brightness Temperature, Surface Soil Moisture
RegreSSM: A novel software tool for downscaling the SMAP L3 soil Petropoulos, George P., Detsikas, Spyridon E., Anagnostopoulos, Vasileios, Lekka, Christina Surface Soil Moisture, Brightness Temperature
A Multi-temporal-scale Framework for Estimating Sub-Daily Soil Moisture by Fusing AMSR2 and SMAP Datasets Wang, Mengran, Song, Peilin, Zheng, Jingyao, Zhao, Tianjie, Zhao, Haigen, Huang, Jingfeng Surface Soil Moisture, Brightness Temperature
A review of forward modelling and retrieval approaches for forest soil Colliander, Andreas, Schwank, Mike, Zhou, Yiwen, Kurum, Mehmet, Vittucci, Cristina, Tsang, Leung, Roy, Alex, Berg, Aaron Brightness Temperature, Surface Soil Moisture, Gross Primary Production (gpp), Heterotrophic Respiration (rh), NET ECOSYSTEM CO2 EXCHANGE (NEE), Soil Organic Carbon (SOC)
Characteristics and influencing factors of soil moisture memory across Hong, Xu, Jia, Shaofeng, Zhu, Wenbin Brightness Temperature, Surface Soil Moisture, 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
Microwave Remote Sensing and Risk Matrix Assessment for Climate Change Fontgalland, Isabel L. M., Fontgalland, Glauco Brightness Temperature, Surface Soil Moisture
Meteorological to agricultural drought transitions compounded by heat waves in historical and future climates Short Gianotti, Daniel J., Gannon, Meriah J., Entekhabi, Dara Brightness Temperature, Surface Soil Moisture, Tropopause, Surface Pressure, Air Temperature, Upper Air Temperature, Total Precipitable Water, Water Vapor, Cloud Height, Cloud Top Pressure, Cloud Top Temperature, Cloud Vertical Distribution, Emissivity, Sea Surface Temperature, Skin Temperature, Carbon Monoxide, Geopotential Height, Humidity, Water Vapor Profiles, Cloud Liquid Water/Ice, Outgoing Longwave Radiation, Methane, Atmospheric Ozone, Tropospheric Ozone, Sulfur Dioxide, Surface Temperature, Cloud Fraction
Revisiting subsurface drought cascades with daily satellite observations of soil moisture and terrestrial water storage Blank, Daniel, Eicker, Annette, Reager, John T., Guntner, Andreas Land Use/Land Cover Classification, Brightness Temperature, Surface Soil Moisture, Root Zone Soil Moisture
Spaceborne estimates of canopy temperature and soil moisture predict daily and annual subalpine tree growth Estey, Eli W., Eitel, Jan U.H., Vierling, Lee A., Peven, Grace L., Cawse-Nicholson, Kerry A., Hook, Simon J., Griffin, Kevin L. Land Surface Temperature, Emissivity, Geolocation, Clouds, Brightness Temperature, Surface Soil Moisture
Spaceborne GNSS-R for Sensing Soil Moisture Using CYGNSS Considering Land Cover Type Song, Shengjia, Zhu, Yongchao, Qu, Xiaochuan, Tao, Tingye Brightness Temperature, Surface Soil Moisture
An Innovative Framework for Hourly Satellite Soil Moisture Retrieval via Integrated Spatiotemporal Downscaling Techniques Song, Peilin, Wang, Mengran, Dong, Lixin, Zhao, Tianjie, Zhao, Haigen, Huang, Jingfeng, Yao, Panpan, Zheng, Jingyao, Zhang, Yongqiang Brightness Temperature, Surface Soil Moisture, Root Zone Soil Moisture
A stand-alone framework for predicting spatiotemporal errors in satellite-based soil moisture using tree-based models and deep neural networks Kim, Subin, Kim, Hyunglok, Kwon, Yonghwan, Nguyen, Hoang Hai 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, Land Use/Land Cover Classification, Brightness Temperature, Surface Soil Moisture
High-resolution soil moisture mapping in northern boreal forests using Jaaskelainen, Emmihenna, Luoto, Miska, Putkiranta, Pauli, Aurela, Mika, Virtanen, Tarmo Vegetation Index, Normalized Difference Vegetation Index (NDVI), Enhanced Vegetation Index (EVI), Surface Soil Moisture, Brightness Temperature
Soil Moisture: analysis of SMAP satellite products in plain zones Degano, Maria Florencia, Beninato, Sabrina, Holzman, Mauro Ezequiel, Bayala, Martin Ignacio, Rivas, Raul Eduardo, Massari, Christian Surface Soil Moisture, Brightness Temperature, Soil Moisture/Water Content
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