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SMAP/SMOS L3 Radiometer 9 km EASE-Grid Soil Moisture V001

Published by NASA NSIDC DAAC | National Aeronautics and Space Administration | Catalog Last Checked: August 04, 2025 at 10:01 AM | Dataset Last Updated: April 01, 2025
The Soil Moisture Active Passive (SMAP, launched in 2015) and the Soil Moisture and Ocean Salinity (SMOS, launched in 2009) missions are each L-band satellites that provide brightness temperature and soil moisture estimates and vegetation optical depth approximately every 2-3 days with a spatial resolution of ~40 km. By integrating brightness temperature observations from both satellites, these data products reduce the revisit time to about one day, improving the ability to monitor fast-response processes such as groundwater drainage and recharge, early dry-down after storms, and pre-storm soil moisture conditions for runoff determination. The Integrated SMAP and SMOS Soil Moisture Data is available in two products: SMOS-Based SMAP L2 Radiometer Half-Orbit 9 km EASE-Grid Soil Moisture (NSIDC-0799): This product is generated by processing half-orbit granules (either 6 AM ascending or 6 PM descending) from the pre-processed SMOS product. The L2 product consists solely of SMOS-based data, incorporating information after SMOS brightness temperatures (TBs) at a 40° incidence angle were inter-calibrated and the soil moisture (SM) and vegetation optical depth (VOD) were retrieved using the SMAP Dual Channel Algorithm (DCA). SMAP/SMOS L3 Radiometer 9 km EASE-Grid Soil Moisture (NSIDC-0800): To generate this product, processing software ingests one day’s worth of granules from both the SMAP SPL2SMP_E product and the SMOS-derived L2 data. The L3 product contains both SMAP and SMOS descending (6:00 AM/PM) and ascending (6:00 PM/AM) data stored in separate arrays.

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Complete Metadata
@type dcat:Dataset
accessLevel public
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[
  "026:00"
]
contactPoint 
{
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  "@type": "vcard:Contact",
  "hasEmail": "mailto:nsidc@nsidc.org"
}
description The Soil Moisture Active Passive (SMAP, launched in 2015) and the Soil Moisture and Ocean Salinity (SMOS, launched in 2009) missions are each L-band satellites that provide brightness temperature and soil moisture estimates and vegetation optical depth approximately every 2-3 days with a spatial resolution of ~40 km. By integrating brightness temperature observations from both satellites, these data products reduce the revisit time to about one day, improving the ability to monitor fast-response processes such as groundwater drainage and recharge, early dry-down after storms, and pre-storm soil moisture conditions for runoff determination. <br> The Integrated SMAP and SMOS Soil Moisture Data is available in two products: <ul> <li>SMOS-Based SMAP L2 Radiometer Half-Orbit 9 km EASE-Grid Soil Moisture (NSIDC-0799): This product is generated by processing half-orbit granules (either 6 AM ascending or 6 PM descending) from the pre-processed SMOS product. The L2 product consists solely of SMOS-based data, incorporating information after SMOS brightness temperatures (TBs) at a 40° incidence angle were inter-calibrated and the soil moisture (SM) and vegetation optical depth (VOD) were retrieved using the SMAP Dual Channel Algorithm (DCA). </li> <li>SMAP/SMOS L3 Radiometer 9 km EASE-Grid Soil Moisture (NSIDC-0800): To generate this product, processing software ingests one day’s worth of granules from both the SMAP SPL2SMP_E product and the SMOS-derived L2 data. The L3 product contains both SMAP and SMOS descending (6:00 AM/PM) and ascending (6:00 PM/AM) data stored in separate arrays. </li> </ul>
distribution 
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identifier C3379565639-NSIDC_ECS
issued 2015-05-01
keyword 
[
  "biosphere",
  "earth-science",
  "land-surface",
  "microwave",
  "soils",
  "spectral-engineering",
  "vegetation"
]
landingPage https://doi.org/10.5067/E1NLXI1VJJ7M
language 
[
  "en-US"
]
modified 2025-04-01
programCode 
[
  "026:001"
]
publisher 
{
  "name": "NASA NSIDC DAAC",
  "@type": "org:Organization"
}
spatial -180.0 -90.0 180.0 90.0
temporal 2015-05-01T00:00:00Z/2021-12-31T23:59:59.999Z
theme 
[
  "geospatial"
]
title SMAP/SMOS L3 Radiometer 9 km EASE-Grid Soil Moisture V001

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