Skip to main content

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: (1) Added 6:00 p.m. ascending half orbits, which provide more frequent regional/global coverage (critical in flood monitoring); soil moisture diurnal variability information (useful in data assimilation systems); and consistency with other similar satellite-based soil moisture products. (2) Derived frozen ground flag (bit 7 of surface_flag) autonomously using Normalized Polarization Ration (NPR)-based passive freeze-thaw retrieval; replaces former radar-based freeze/thaw flag.

Product Summary

Platforms
SMAP
Instruments
SMAP L-BAND RADAR
Spatial Extent

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

Spatial Resolution
36 Kilometers x 36 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
C4112448319-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 L3 Radiometer Global Daily 36 km EASE-Grid Soil Moisture, Version 4 [Dataset]. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/OBBHQ5W22HME Date Accessed: 2026-10-03

Documents

No Results

QUESTIONS & SUPPORT

Have a question?

Get help with NASA Earth science data, datasets, tools, services, and metadata on the Earthdata Forum. Experienced staff in the data user community review and answer questions.

Get help on Earthdata Forum
Earthdata
Forum

Publications Citing This Dataset

Filters
Title Authors Year Referenced Datasets
Assessing SMAP for enhanced wildfire danger prediction in boreal-Arctic ecosystems
  • Bourgeau-Chavez, Laura L., Hanes, Chelene, Billmire, Michael, Bosse, Karl, Battaglia, Michael J., Colliander, Andreas
A global dataset of remote sensing-based soil critical point and permanent wilting point
  • Xu, Yawei, He, Qing, Lu, Hui, Yang, Kun, Entekhabi, Dara, Short Gianotti, Daniel J.
Optimal index insurance and basis risk decomposition: an application to
  • Stigler, Matthieu, Lobell, David
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.
Characterizing the accuracy of satellite-based products to detect soil
  • Min, Xiaoxiao, Li, Danlu, Shangguan, YuLin, Tian, Shuo, Shi, Zhou
Evaluating Satellite Soil Moisture Datasets for Drought Monitoring in
  • Bhardwaj, Jessica, Kuleshov, Yuriy, Chua, Zhi-Weng, Watkins, Andrew B., Choy, Suelynn, Sun, Qian (Chayn)
Uncertainty analysis of eleven multisource soil moisture products in the third pole environment based on the three-corned hat method
  • Liu, Jin, Chai, Linna, Dong, Jianzhi, Zheng, Donghai, Wigneron, J.-P., Liu, Shaomin, Zhou, Ji, Xu, Tongren, Yang, Shiqi, Song, Yongze, Qu, Yuquan, Lu, Zheng
Improving CyGNSS-Based Land Remote Sensing: Track-Wise Data Calibration
  • Yan, Qingyun, Hu, Ting, Jin, Shuanggen, Huang, Weimin, Jia, Yan, Chen, Tiexi, Wang, Jian
A Unified Data-Driven Method to Derive Hydrologic Dynamics From Global
  • Mao, Yixin, Crow, Wade T., Nijssen, Bart
Simultaneous retrieval of surface roughness parameters for bare soils from combined activepassive microwave SMAP observations
  • Fluhrer, Anke, Jagdhuber, Thomas, Akbar, Ruzbeh, O'Neill, Peggy E., Entekhabi, Dara
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.
Timing is Everything-Drought Classification for Risk Assessment
  • Graw, Valerie, Ghazaryan, Gohar, Schreier, Jonas, Gonzalez, Javier, Abdel-Hamid, Ayman, Walz, Yvonne, Dall, Karen, Post, Joachim, Jordaan, Andries, Dubovyk, Olena
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
Terrestrial Evaporation and Moisture Drainage in a Warmer Climate
  • Short Gianotti, Daniel J., Akbar, Ruzbeh, Feldman, Andrew F., Salvucci, Guido D., Entekhabi, Dara
Dual state/rainfall correction via soil moisture assimilation for improved streamflow simulation: evaluation of a large-scale implementation with Soil Moisture ...
  • Mao, Yixin, Crow, Wade T., Nijssen, Bart
Evaluating the Potential and Challenges of an Uncertainty Quantification
  • Fang, Kuai, Kifer, Daniel, Lawson, Kathryn, Shen, Chaopeng
OBSERVATION-DRIVEN ESTIMATION OF SURFACE WATER BALANCE COMPONENTS FROM
  • Akbar, Ruzbeh, Short Gianotti, Daniel J., McColl, Kaighin A., Salvucci, Guido D., Entekhabi, Dara
A framework for diagnosing factors degrading the streamflow performance of a soil moisture data assimilation system
  • Mao, Yixin, Crow, Wade T., Nijssen, Bart
Simultaneous retrieval of surface roughness parameters from combined active-passive SMAP observations
  • Fluhrer, Anke, Jagdhuber, Thomas, Akbar, Ruzbeh, O'Neill, Peggy, Entekhabi, Dara
Thermal Weakening, Convergent Flow, and Vertical Heat Transport in the
  • Holschuh, N., Lilien, D. A., Christianson, K.
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.
Satellite and Station Observations Demonstrate Water Availability's Effect on Continental-Scale Evaporative and Photosynthetic Land Surface Dynamics
  • Short Gianotti, Daniel J., Rigden, Angela J., Salvucci, Guido D., Entekhabi, Dara
Enhanced Firn Densification in High-Accumulation Shear Margins of the NE
  • Riverman, K. L., Alley, R. B., Anandakrishnan, S., Christianson, K., Holschuh, N. D., Medley, B., Muto, A., Peters, L. E.
Investigating Relationship Between Soil Moisture and Precipitation Globally Using Remote Sensing Observations
  • Sehler, Robin, Li, Jingjing, Reager, JT, Ye, Hengchun
A New Soil Moisture Downscaling Approach for SMAP, SMOS, and ASCAT by
  • Montzka, Carsten, Rotzer, Kathrina, Bogena, Heye, Sanchez, Nilda, Vereecken, Harry
You're viewing 25 of 35