Access to data via FTP for this data set will no longer be available after January 31, 2017. The NASA NSIDC DAAC is transitioning to data distribution through HTTPS, which requires users to login with an Earthdata Login username and password. Data will continue to be available free of charge.

Get Data

Data Set ID:
NSIDC-0036

Nimbus-7 SMMR Pathfinder Brightness Temperatures, Version 1

The Nimbus-7 SMMR Pathfinder Brightness Temperatures data set contains global brightness temperatures in swath format (level 1b) from 25 October 1978 to 20 August 1987. The instrument obtained near-global coverage at five frequencies (6.6, 10.7, 18, 21, and 37 GHz) in both horizontal and vertical polarizations, at a constant incidence angle of 50.3 degrees, every six days. Data are stored as daily orbit files in compressed Hierarchical Data Format (HDF) and are available on FTP.

The Nimbus-7 SMMR Level 1B Pathfinder data set was created at the Jet Propulsion Laboratory (JPL) from a level 1A 'TAT' data set provided by the Goddard Space Flight Center (GFSC). The SMMR operated continuously from 25 Oct 1978 through 16 November 1987, at which time it began alernate-day operation. The processed level 1B SMMR data are stored as orbit files in HDF format. Each level 1B orbit file covers a time period of approximately 104.16 minutes. The file size for an uncompressed orbit file is approximately 4.3 megabytes. The total volume of the level 1B data set is approximately 70 gigabytes (compressed).

Geographic Coverage

Spatial Coverage:
  • N: 84, S: -84, E: 180, W: -180

Spatial Resolution: Not Specified
Temporal Coverage:
  • 25 October 1978 to 20 August 1987
Temporal Resolution: Not specified
Parameter(s):
  • Microwave > Brightness Temperature
Platform(s) NIMBUS-7
Sensor(s): RADIOMETERS, SMMR
Data Format(s):
  • HDF
Version: V1
Data Contributor(s): Eni Njoku

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.

Njoku, E. G. 2003. Nimbus-7 SMMR Pathfinder Brightness Temperatures, Version 1. [Indicate subset used]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. doi: http://dx.doi.org/10.5067/7Y1XWXT07HH8. [Date Accessed].
No technical references available for this data set.
No FAQs or How Tos available for this data set.

Access complete Knowledge Base

Questions? Please contact:
NSIDC User Services
Phone: 1 303 492-6199
Email: nsidc@nsidc.org