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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) radar as well as a variety of ancillary data sources. SMAP L-band soil moisture data are resampled to an Earth-fixed, global, cylindrical 3 km Equal-Area Scalable Earth Grid, Version 2.0 (EASE-Grid 2.0).

Version Description

Changes to this version include:
  • Transitioned to Validated-Stage 1
  • Uses SPL2SMA V3 Validated data as input; inherited all changes and improvements of the new 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 RADAR
Spatial Extent

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

Spatial Resolution
3 Kilometers x 3 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
C2872766452-NSIDC_CPRD
Data State
COMPLETE
Number of Files/Granules
84
Processing Level
3
Published
Science Keywords
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

Kim, S., Van Zyl, J., Dunbar, R., Njoku, E., Johnson, J., Moghaddam, M., & Tsang, L. (2016). SMAP L3 Radar Global Daily 3 km EASE-Grid Soil Moisture, Version 3 [Dataset]. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/IGQNPB6183ZX Date Accessed: 2026-08-02

Documents

Publications Citing This Dataset

Filters
Title Year Author Topic
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
Nitrogen fixing shrubs advance the pace of tall-shrub expansion in low-Arctic tundra Schore, Aiden I. G., Fraterrigo, Jennifer M., Salmon, Verity G., Yang, Dedi, Lara, Mark J. SIGMA NAUGHT, Soil Moisture/Water Content
A clearer view of Earth's water cycle via neural networks and satellite data Larson, Albert SIGMA NAUGHT, Soil Moisture/Water Content, Brightness Temperature, Surface Soil Moisture
Theory of Microwave Remote Sensing of Vegetation Effects, SoOp and Rough Tsang, Leung, Liao, Tien-Hao, Gao, Ruoxing, Xu, Haokui, Gu, Weihui, Zhu, Jiyue SIGMA NAUGHT, Soil Moisture/Water Content
Intercomparison of electromagnetic scattering models for delay-Doppler maps along a CYGNSS land track with topography Campbell, James D., Akbar, Ruzbeh, Bringer, Alexandra, Comite, Davide, Dente, Laura, Gleason, Scott T., Guerriero, Leila, Hodges, Erik, Johnson, Joel T., Kim, Seung-Bum, Melebari, Amer, Pierdicca, Nazzareno, Ruf, Christopher S., Tsang, Leung, Wang, Tianlin, Xu, Haokui, Zhu, Jiyue, Moghaddam, Mahta Soil Temperature, Soil Moisture/Water Content, SIGMA NAUGHT, Digital Elevation/Terrain Model (DEM), Land Use/Land Cover Classification, Normalized Difference Vegetation Index (NDVI), Soil Classification, Soil Texture, Surface Roughness, Radar Cross-Section, Radar Reflectivity, Flight Data Logs, Radar Cross-Section, Radar Reflectivity
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 SIGMA NAUGHT, Soil Moisture/Water Content, Brightness Temperature
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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