Due to a software issue at the SMAP Science Data System (SDS), SMAP products cannot be produced automatically. Data production, and therefore data delivery, may be sporadic and come in waves until the software issue is fixed. In particular, users should expect large data gaps over the weekends which will be back-filled every Monday. We apologize for any inconvenience and a patch to fix the issue should be delivered within the next month.
Data Set ID: 
SPL1BTB

SMAP L1B Radiometer Half-Orbit Time-Ordered Brightness Temperatures, Version 5

This Level-1B (L1B) product provides calibrated estimates of time-ordered geolocated brightness temperatures measured by the Soil Moisture Active Passive (SMAP) passive microwave radiometer. SMAP L-band brightness temperatures are referenced to the Earth's surface with undesired and erroneous radiometric sources removed.

This is the most recent version of these data.

Version Summary: 

Changes to this version include:
- An improved calibration methodology was applied to Level-1 brightness temperatures, which uses:
* the internal instrument reference load (instead of the global ocean as in V4)
* deep space measurements during monthly cold sky maneuvers and special cold sky maneuvers with stable open-ocean background to concurrently retrieve all calibration parameters
* a longer temporal baseline of cold sky records.

For the full major and minor version history, go to https://nsidc.org/data/smap/data_versions.

COMPREHENSIVE Level of Service

Data: Data integrity and usability verified; data customization services available for select data

Documentation: Key metadata and comprehensive user guide available

User Support: Assistance with data access and usage; guidance on use of data in tools and data customization services

See All Level of Service Details

Parameter(s):
  • MICROWAVE > ANTENNA TEMPERATURE
  • MICROWAVE > ANTENNA TEMPERATURE > BRIGHTNESS TEMPERATURE
Data Format(s):
  • HDF5
Spatial Coverage:
N: 86.4, 
S: -86.4, 
E: 180, 
W: -180
Platform(s):SMAP
Spatial Resolution:
  • 47 km x 36 km
Sensor(s):SMAP L-BAND RADIOMETER
Temporal Coverage:
  • 31 March 2015
Version(s):V5
Temporal Resolution49 minuteMetadata XML:View Metadata Record
Data Contributor(s):Piepmeier, J. R., P. Mohammed, J. Peng, E. J. Kim, G. De Amici, J. Chaubell, and C. Ruf.

Geographic Coverage

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As a condition of using these data, you must cite the use of this data set using the following citation. For more information, see our Use and Copyright Web page.

Piepmeier, J. R., P. Mohammed, J. Peng, E. J. Kim, G. De Amici, J. Chaubell, and C. Ruf. 2020. SMAP L1B Radiometer Half-Orbit Time-Ordered Brightness Temperatures, Version 5. [Indicate subset used]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. doi: https://doi.org/10.5067/ZHHBN1KQLI20. [Date Accessed].

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How To

Programmatic Data Access Guide
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Visualize and download NSIDC DAAC data with NASA Worldview
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FAQ

What are the latencies for SMAP radiometer data sets?
The following table describes both the required and actual latencies for the different SMAP radiometer data sets. Latency is defined as the time (# days, hh:mm:ss) from data acquisition to product generation. Short name Title Latency Required # days hh:mm:ss Actual (... read more