Data transformation services through NASA Earthdata Harmony are now available for L2-L4 Soil Moisture Active Passive (SMAP) data sets archived at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). Earthdata Harmony allows users to subset and transform NASA ESDIS data available in Earthdata Cloud. Users can access Earthdata Harmony through the NASA Earthdata Search interface or programmatically via Harmony’s API or harmony-py Python library. Data processed by Harmony can be accessed directly in the cloud or downloaded to a local computer for further analysis.
Details about Earthdata Harmony can be found at
https://www.earthdata.nasa.gov/learn/articles/harmony-in-the-cloud
Harmony service options vary by data set.
Spatial and variable subsetting + GeoTIFF reformatting:
SMAP L2 Radar Half-Orbit 3 km EASE-Grid Soil Moisture, Version 3 (SPL2SMA)
https://nsidc.org/data/spl2sma/versions/3
SMAP L2 Radar/Radiometer Half-Orbit 9 km EASE-Grid Soil Moisture, Version 3 (SPL2SMAP)
https://nsidc.org/data/spl2smap/versions/3
SMAP L2 Radiometer Half-Orbit 36 km EASE-Grid Soil Moisture, Version 9 (SPL2SMP)
https://nsidc.org/data/spl2smp/versions/9
SMAP Enhanced L2 Radiometer Half-Orbit 9 km EASE-Grid Soil Moisture, Version 6 (SPL2SMP_E)
https://nsidc.org/data/spl2smp_e/versions/6
Spatial and variable subsetting + GeoTIFF reformatting + EPSG:4326 transformation:
SMAP/Sentinel-1 L2 Radiometer/Radar 30-Second Scene 3 km EASE-Grid Soil Moisture, Version 3 (SPL2SMAP_S)
https://nsidc.org/data/spl2smap_s/versions/3
SMAP L3 Radar Northern Hemisphere Daily 3 km EASE-Grid Freeze/Thaw State, Version 3 (SPL3FTA)
https://nsidc.org/data/spl3fta/versions/3
SMAP L3 Radiometer Global and Northern Hemisphere Daily 36 km EASE-Grid Freeze/Thaw State, Version 4 (SPL3FTP)
https://nsidc.org/data/spl3ftp/versions/4
SMAP Enhanced L3 Radiometer Global and Northern Hemisphere Daily 9 km EASE-Grid Freeze/Thaw State, Version 4 (SPL3FTP_E)
https://nsidc.org/data/spl3ftp_e/versions/4
SMAP L3 Radar Global Daily 3 km EASE-Grid Soil Moisture, Version 3 (SPL3SMA)
https://nsidc.org/data/spl3sma/versions/3
SMAP L3 Radar/Radiometer Global Daily 9 km EASE-Grid Soil Moisture, Version 3 (SPL3SMAP)
https://nsidc.org/data/spl3smap/versions/3
SMAP L3 Radiometer Global Daily 36 km EASE-Grid Soil Moisture, Version 9 (SPL3SMP)
https://nsidc.org/data/spl3smp/versions/9
SMAP Enhanced L3 Radiometer Global and Polar Grid Daily 9 km EASE-Grid Soil Moisture, Version 6 (SPL3SMP_E)
https://nsidc.org/data/spl3smp_e/versions/6
SMAP L4 Global Daily 9 km EASE-Grid Carbon Net Ecosystem Exchange, Version 8 (SPL4CMDL)
https://nsidc.org/data/spl4cmdl/versions/8
SMAP L4 Global 3-hourly 9 km EASE-Grid Surface and Root Zone Soil Moisture Analysis Update, Version 8 (SPL4SMAU)
https://nsidc.org/data/spl4smau/versions/8
SMAP L4 Global 3-hourly 9 km EASE-Grid Surface and Root Zone Soil Moisture Geophysical Data, Version 8 (SPL4SMGP)
https://nsidc.org/data/spl4smgp/versions/8
SMAP L4 Global 9 km EASE-Grid Surface and Root Zone Soil Moisture Land Model Constants, Version 8 (SPL4SMLM)
https://nsidc.org/data/spl4smlm/versions/8
To start using Earthdata Harmony in Earthdata Search, please refer to the following help article:
https://nsidc.org/data/user-resources/help-center/search-order-and-customize-nsidc-daac-data-nasa-earthdata-search
Access to the legacy on premises archive and associated services for these data sets will be retired on 28 October 2025. Users are encouraged to update their customization workflows to use the new Earthdata Harmony customization service in Earthdata Search or the new API.
For any questions or comments, please contact NSIDC DAAC User Services at nsidc@nsidc.org.