Soil Moisture Active Passive Data (SMAP)

Data

The following table includes the official SMAP mission data currently available from NSIDC DAAC. These data products have been produced and validated by the SMAP Science Team. 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	TEMPORAL COVERAGE	PARAMETER(S)
Near Real-time SMAP L1B Radiometer Half-Orbit Time-Ordered Brightness Temperatures, Version 105 (SPL1BTB_NRT)	26 June 2025 to present	ANTENNA TEMPERATURE \| BRIGHTNESS TEMPERATURE
Near Real-time SMAP L2 Radiometer Half-Orbit 36 km EASE-Grid Soil Moisture, Version 107 (SPL2SMP_NRT)	26 June 2025 to present	BRIGHTNESS TEMPERATURE \| SURFACE SOIL MOISTURE
SMAP Enhanced L1C Radiometer Half-Orbit 9 km EASE-Grid Brightness Temperatures, Version 4 (SPL1CTB_E)	31 March 2015 to present	BRIGHTNESS TEMPERATURE
SMAP Enhanced L2 Radiometer Half-Orbit 9 km EASE-Grid Soil Moisture, Version 6 (SPL2SMP_E)	31 March 2015 to present	BRIGHTNESS TEMPERATURE \| SURFACE SOIL MOISTURE
SMAP Enhanced L3 Radiometer Global and Northern Hemisphere Daily 9 km EASE-Grid Freeze/Thaw State, Version 4 (SPL3FTP_E)	31 March 2015 to present	TRANSITION DIRECTION
SMAP Enhanced L3 Radiometer Global and Polar Grid Daily 9 km EASE-Grid Soil Moisture, Version 6 (SPL3SMP_E)	31 March 2015 to present	BRIGHTNESS TEMPERATURE \| SURFACE SOIL MOISTURE
SMAP L1A Radar Time-Ordered Parsed Telemetry, Version 1 (SPL1AA)	13 April 2015 to 7 July 2015	Sigma Nought
SMAP L1A Radiometer Time-Ordered Parsed Telemetry, Version 2 (SPL1AP)	31 March 2015 to present	SENSOR COUNTS
SMAP L1B Radar Half-Orbit Time-Ordered Low-Resolution σo Data, Version 1 (SPL1BS0)	13 April 2015 to 7 July 2015	Sigma Nought
SMAP L1B Radiometer Half-Orbit Time-Ordered Brightness Temperatures, Version 6 (SPL1BTB)	31 March 2015 to present	BRIGHTNESS TEMPERATURE
SMAP L1C Radar Half-Orbit High-Resolution σo Data on 1 km Swath Grid, Version 1 (SPL1CS0)	13 April 2015 to 7 July 2015	Sigma Nought
SMAP L1C Radiometer Half-Orbit 36 km EASE-Grid Brightness Temperatures, Version 6 (SPL1CTB)	31 March 2015 to present	BRIGHTNESS TEMPERATURE
SMAP L2 Radar Half-Orbit 3 km EASE-Grid Soil Moisture, Version 3 (SPL2SMA)	13 April 2015 to 7 July 2015	SIGMA NAUGHT \| SOIL MOISTURE/WATER CONTENT
SMAP L2 Radar/Radiometer Half-Orbit 9 km EASE-Grid Soil Moisture, Version 3 (SPL2SMAP)	13 April 2015 to 7 July 2015	BRIGHTNESS TEMPERATURE \| SIGMA NAUGHT \| SOIL MOISTURE/WATER CONTENT
SMAP L2 Radiometer Half-Orbit 36 km EASE-Grid Soil Moisture, Version 9 (SPL2SMP)	31 March 2015 to present	BRIGHTNESS TEMPERATURE \| SURFACE SOIL MOISTURE
SMAP L3 Radar Global Daily 3 km EASE-Grid Soil Moisture, Version 3 (SPL3SMA)	13 April 2015 to 7 July 2015	SIGMA NAUGHT \| SOIL MOISTURE/WATER CONTENT
SMAP L3 Radar Northern Hemisphere Daily 3 km EASE-Grid Freeze/Thaw State, Version 3 (SPL3FTA)	13 April 2015 to 7 July 2015	FREEZE/THAW \| SIGMA NAUGHT \| TRANSITION DIRECTION
SMAP L3 Radar/Radiometer Global Daily 9 km EASE-Grid Soil Moisture, Version 3 (SPL3SMAP)	13 April 2015 to 7 July 2015	BRIGHTNESS TEMPERATURE \| SIGMA NAUGHT \| SOIL MOISTURE/WATER CONTENT
SMAP L3 Radiometer Global and Northern Hemisphere Daily 36 km EASE-Grid Freeze/Thaw State, Version 4 (SPL3FTP)	31 March 2015 to present	TRANSITION DIRECTION
SMAP L3 Radiometer Global Daily 36 km EASE-Grid Soil Moisture, Version 9 (SPL3SMP)	31 March 2015 to present	BRIGHTNESS TEMPERATURE \| SURFACE SOIL MOISTURE
SMAP L4 Global 3-hourly 9 km EASE-Grid Surface and Root Zone Soil Moisture Analysis Update, Version 8 (SPL4SMAU)	31 March 2015 to present	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 8 (SPL4SMGP)	31 March 2015 to present	ROOT ZONE SOIL MOISTURE \| SURFACE SOIL MOISTURE
SMAP L4 Global 9 km EASE-Grid Surface and Root Zone Soil Moisture Land Model Constants, Version 8 (SPL4SMLM)	31 March 2015 to present	SOIL CLASSIFICATION \| SOIL DEPTH \| SOIL POROSITY \| SOIL TEXTURE \| TERRAIN ELEVATION
SMAP L4 Global Daily 9 km EASE-Grid Carbon Net Ecosystem Exchange, Version 8 (SPL4CMDL)	31 March 2015 to present	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)	31 March 2015 to present	BRIGHTNESS TEMPERATURE \| SIGMA NAUGHT \| SURFACE SOIL MOISTURE