The SMAP Science Data System (SDS) has released updated NASA SMAP data products at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). The following NASA SMAP Levels 1-3 data have been updated:
- SMAP L1B Radiometer Half-Orbit Time-Ordered Brightness Temperatures, Version 4 (SPL1BTB) Data Set DOI: https://doi.org/10.5067/VA6W2M0JTK2N
- SMAP L1C Radiometer Half-Orbit 36 km EASE-Grid Brightness Temperatures, Version 4 (SPL1CTB) Data Set DOI: https://doi.org/10.5067/ZVILG0PS6CTI
- SMAP Enhanced L1C Radiometer Half-Orbit 9 km EASE-Grid Brightness Temperatures, Version 2 (SPL1CTB_E) Data Set DOI: https://doi.org/10.5067/0DGGEWUC6MLY
- SMAP L2 Radiometer Half-Orbit 36 km EASE-Grid Soil Moisture, Version 5 (SPL2SMP) Data Set DOI: https://doi.org/10.5067/SODMLCE6LGLL
- SMAP Enhanced L2 Radiometer Half-Orbit 9 km EASE-Grid Soil Moisture, Version 2 (SPL2SMP_E) Data Set DOI: https://doi.org/10.5067/K4A1SNL5DLON
- SMAP L3 Radiometer Global Daily 36 km EASE-Grid Soil Moisture, Version 5 (SPL3SMP) Data Set DOI: https://doi.org/10.5067/ZX7YX2Y2LHEB
- SMAP Enhanced L3 Radiometer Global Daily 9 km EASE-Grid Soil Moisture, Version 2 (SPL3SMP_E) Data Set DOI: https://doi.org/10.5067/RFKIZ5QY5ABN
- SMAP L3 Radiometer Global and Northern Hemisphere Daily 36 km EASE-Grid Freeze/Thaw State, Version 2 (SPL3FTP) Data Set DOI: https://doi.org/10.5067/YN94K53QM061
- SMAP Enhanced L3 Radiometer Global and Northern Hemisphere Daily 9 km EASE-Grid Freeze/Thaw State, Version 2 (SPL3FTP_E) Data Set DOI: https://doi.org/10.5067/1M7OJC7R7VKI
Primary changes include:
- Level-1 Brightness Temperatures: Added procedure to correct brightness temperatures for water/land contamination near coastlines
- Level-2 and -3 Soil Moisture: Improved depth correction for effective soil temperature
- Level-3 Freeze/Thaw: Implemented supplementary single-channel V-pol (SCV) algorithm for areas of lower latitudes, extending the spatial coverage to global