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DMSP SSM/I-SSMIS Daily Polar Gridded Brightness Temperatures, Version 4

NSIDC produces daily gridded brightness temperature data from orbital swath data generated by the Special Sensor Microwave/Imager (SSM/I) aboard the Defense Meteorological Satellite Program (DMSP) F8, F11, and F13 platforms and the Special Sensor Microwave Imager/Sounder (SSMIS) aboard DMSP-F17. The SSM/I and SSMIS channels used to calculate brightness temperatures include 19.3 GHz vertical and horizontal, 22.2 GHz vertical, 37.0 GHz vertical and horizontal, 85.5 GHz vertical and horizontal (on SSM/I), and 91.7 GHz vertical and horizontal (on SSMIS). Thus, a total of nine channels result from vertical and horizontal polarization for each of five frequencies, with the exception of 22.2 GHz, which is vertical only. The gridded brightness temperatures are distributed in polar stereographic projection. Orbital data for each 24-hour period are mapped to respective grid cells using a simple sum and average method (drop-in-the-bucket method). 85.5 GHz and 91.7 GHz data are gridded at a resolution of 12.5 km, with all other frequencies at a resolution of 25 km. All SSM/I and SSMIS gridded brightness temperature data are stored as scaled 2-byte integers in flat binary arrays and are available via FTP.

Geographic Coverage

Data Set Tabs

Spatial Coverage:
  • N: 90, S: 30, E: 180, W: -180

  • N: -39, S: -90, E: 180, W: -180

Spatial Resolution:
  • 25 km x 25 km
  • 12.5 km x 12.5 km
Temporal Coverage:
  • 9 July 1987 to 31 December 2015
(updated 2016)
Temporal Resolution: 1 day
  • Microwave > Brightness Temperature
Platform(s) DMSP 5D-2/F11, DMSP 5D-2/F13, DMSP 5D-2/F8, DMSP 5D-3/F17
Sensor(s): SSM/I, SSMIS
Data Format(s):
  • Binary
Version: V4
Data Contributor(s): Jim Maslanik, Julienne Stroeve, Walt Meier

Data Citation

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.

Maslanik, J. and J. Stroeve. 2004, updated 2016. DMSP SSM/I-SSMIS Daily Polar Gridded Brightness Temperatures, Version 4. [Indicate subset used]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. doi: [Date Accessed].

Questions? Please contact:

NSIDC User Services
Phone: 1 303 492-6199
Fax: 1 303 492-2468
Contact Address:
National Snow and Ice Data Center
University of Colorado
City: Boulder
Province or State: CO
Postal Code: 80309-0449
Country: USA