•  On Wednesday, June 7, from 6:00 a.m. to 1:00 p.m. (US Mountain Time), the following data collections may not be available due to planned system maintenance: ASO, AMSR Unified, AMSR-E, Aquarius, High Mountain Asia, IceBridge, ICESat/GLAS, ICESat-2, LVIS, MEaSUREs, MODIS, Nimbus, SMAP, SnowEx, SSM/I-SSMIS and VIIRS.

Soil Moisture Active Passive Data (SMAP)

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Data

The following table lists SMAP science data products and related data available from the NSIDC DAAC. The Level 1 products contain raw or calibrated and geolocated instrument measurements from the SMAP Radar and Radiometer; all Level 1 products have a temporal resolution of 49 minutes, the length of time required for the SMAP satellite to complete a half orbit of the Earth. The Level 2 products contain soil moisture retrievals derived from Level 1 products and ancillary files; all Level 2 products are based on half orbits, with a temporal resolution of 49 minutes. The Level 3 products are daily composites of the Level 2 soil moisture and freeze/thaw state data. The Level 4 products provide model-derived root-zone soil moisture and carbon net ecosystem exchange.

For more information, see the SMAP Data Products description on the Jet Propulsion Laboratory website.

SMAP Data Sets

Data for this collection: 25
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NAME SPATIAL RESOLUTION PARAMETER(S)
Near Real-time SMAP L1B Radiometer Half-Orbit Time-Ordered Brightness Temperatures, Version 105 (SPL1BTB_NRT) 47 km x 36 km
ANTENNA TEMPERATURE BRIGHTNESS TEMPERATURE
Near Real-time SMAP L2 Radiometer Half-Orbit 36 km EASE-Grid Soil Moisture, Version 107 (SPL2SMP_NRT) 36 km x 36 km
BRIGHTNESS TEMPERATURE SURFACE SOIL MOISTURE
SMAP Enhanced L1C Radiometer Half-Orbit 9 km EASE-Grid Brightness Temperatures, Version 3 (SPL1CTB_E) 9 km x 9 km
BRIGHTNESS TEMPERATURE
SMAP Enhanced L2 Radiometer Half-Orbit 9 km EASE-Grid Soil Moisture, Version 5 (SPL2SMP_E) 9 km x 9 km
BRIGHTNESS TEMPERATURE SURFACE SOIL MOISTURE
SMAP Enhanced L3 Radiometer Global and Northern Hemisphere Daily 9 km EASE-Grid Freeze/Thaw State, Version 3 (SPL3FTP_E) 9 km x 9 km
BRIGHTNESS TEMPERATURE FREEZE/THAW TRANSITION DIRECTION
SMAP Enhanced L3 Radiometer Global and Polar Grid Daily 9 km EASE-Grid Soil Moisture, Version 5 (SPL3SMP_E) 9 km x 9 km
BRIGHTNESS TEMPERATURE SURFACE SOIL MOISTURE
SMAP L1A Radar Time-Ordered Parsed Telemetry, Version 1 (SPL1AA) 1 km to 3 km x 1 km to 3 km
SIGMA NOUGHT
SMAP L1A Radiometer Time-Ordered Parsed Telemetry, Version 2 (SPL1AP) 40 km x 40 km
SENSOR COUNTS
SMAP L1B Radar Half-Orbit Time-Ordered Low-Resolution σo Data, Version 1 (SPL1BS0) 1 km to 3 km x 1 km to 3 km
SIGMA NOUGHT
SMAP L1B Radiometer Half-Orbit Time-Ordered Brightness Temperatures, Version 5 (SPL1BTB) 47 km x 36 km
ANTENNA TEMPERATURE BRIGHTNESS TEMPERATURE
SMAP L1C Radar Half-Orbit High-Resolution σo Data on 1 km Swath Grid, Version 1 (SPL1CS0) 1 km to 3 km x 1 km to 3 km
SIGMA NOUGHT
SMAP L1C Radiometer Half-Orbit 36 km EASE-Grid Brightness Temperatures, Version 5 (SPL1CTB) 36 km x 36 km
BRIGHTNESS TEMPERATURE
SMAP L2 Radar Half-Orbit 3 km EASE-Grid Soil Moisture, Version 3 (SPL2SMA) 3 km x 3 km
SIGMA NAUGHT SOIL MOISTURE
SMAP L2 Radar/Radiometer Half-Orbit 9 km EASE-Grid Soil Moisture, Version 3 (SPL2SMAP) 9 km x 9 km
BRIGHTNESS TEMPERATURE SIGMA NAUGHT SOIL MOISTURE
SMAP L2 Radiometer Half-Orbit 36 km EASE-Grid Soil Moisture, Version 8 (SPL2SMP) 36 km x 36 km
BRIGHTNESS TEMPERATURE SURFACE SOIL MOISTURE
SMAP L3 Radar Global Daily 3 km EASE-Grid Soil Moisture, Version 3 (SPL3SMA) 3 km x 3 km
SIGMA NAUGHT SOIL MOISTURE
SMAP L3 Radar Northern Hemisphere Daily 3 km EASE-Grid Freeze/Thaw State, Version 3 (SPL3FTA) 3 km x 3 km
FREEZE/THAW SIGMA NAUGHT TRANSITION DIRECTION
SMAP L3 Radar/Radiometer Global Daily 9 km EASE-Grid Soil Moisture, Version 3 (SPL3SMAP) 9 km x 9 km
BRIGHTNESS TEMPERATURE SIGMA NAUGHT SOIL MOISTURE
SMAP L3 Radiometer Global and Northern Hemisphere Daily 36 km EASE-Grid Freeze/Thaw State, Version 3 (SPL3FTP) 36 km x 36 km
BRIGHTNESS TEMPERATURE FREEZE/THAW TRANSITION DIRECTION
SMAP L3 Radiometer Global Daily 36 km EASE-Grid Soil Moisture, Version 8 (SPL3SMP) 36 km x 36 km
BRIGHTNESS TEMPERATURE SURFACE SOIL MOISTURE
SMAP L4 Global 3-hourly 9 km EASE-Grid Surface and Root Zone Soil Moisture Analysis Update, Version 7 (SPL4SMAU) 9 km x 9 km
ROOT ZONE SOIL MOISTURE SURFACE SOIL MOISTURE
SMAP L4 Global 3-hourly 9 km EASE-Grid Surface and Root Zone Soil Moisture Geophysical Data, Version 7 (SPL4SMGP) 9 km x 9 km
ROOT ZONE SOIL MOISTURE SURFACE SOIL MOISTURE
SMAP L4 Global 9 km EASE-Grid Surface and Root Zone Soil Moisture Land Model Constants, Version 7 (SPL4SMLM) 9 km x 9 km
SOIL CLASSIFICATION SOIL DEPTH SOIL POROSITY SOIL TEXTURE TERRAIN ELEVATION
SMAP L4 Global Daily 9 km EASE-Grid Carbon Net Ecosystem Exchange, Version 7 (SPL4CMDL) 9 km x 9 km
GROSS PRIMARY PRODUCTION (GPP) HETEROTROPHIC RESPIRATION (RH) NET ECOSYSTEM CO2 EXCHANGE (NEE) SOIL ORGANIC CARBON (SOC)
SMAP/Sentinel-1 L2 Radiometer/Radar 30-Second Scene 3 km EASE-Grid Soil Moisture, Version 3 (SPL2SMAP_S) 3 km x 3 km
BRIGHTNESS TEMPERATURE SIGMA NAUGHT SURFACE SOIL MOISTURE
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