Data Set ID:

AVHRR Polar Pathfinder Twice-Daily 5 km EASE-Grid Composites, Version 3

This data set is no longer available due to errors in the data. See the Error Sources section of the data set documentation for details. If you have further questions, please contact NSIDC User Services by e-mail or telephone at +1 303.492.6199.

The Advanced Very High Resolution Radiometer (AVHRR) Polar Pathfinder Twice-Daily 5 km EASE-Grid Composites are a collection of products for both poles, consisting of twice-daily calibrated and gridded satellite channel data and derived parameters. Data include five AVHRR channels, clear sky surface broadband albedo and skin temperature, solar zenith angle, satellite elevation angle, sun-satellite relative azimuth angle, surface type mask, cloud mask, and Universal Coordinated Time (UTC) of acquisition. AVHRR Polar Pathfinder data extend pole ward from 48.4 degrees north and 53.2 degrees south latitudes, from 24 July 1981 through 30 June 2005. Data are in 1-byte and 2-byte integer grid format and are available by FTP.

Note: Due to a problem with the NOAA-16 scan motor, all the channel data is shifted sporadically between 2001 and 2005, causing the channels to contain data from another channel; thus, the derived parameters also contain errors during this time-period. See Table 12 in the Error Sources section of this document for specific dates.

Geographic Coverage

Data Set Tabs

Spatial Coverage:
  • N: 90, S: 48.4, E: 180, W: -180

  • N: -53.2, S: -90, E: 180, W: -180

Spatial Resolution:
  • 5 km x 5 km
Temporal Coverage
  • 24 July 1981 to 30 June 2005
Temporal Resolution:
12 hour
  • Surface Radiative Properties > Albedo
  • Snow/Ice > Albedo
  • Atmospheric Radiation > Albedo
  • Infrared Wavelengths > Brightness Temperature
  • Clouds > Cloud Amount/Frequency
  • Infrared Wavelengths > Infrared Radiance
  • Land Temperature > Land Surface Temperature
  • Land Temperature > Skin Temperature
  • Infrared Wavelengths > Thermal Infrared
  • Surface Radiative Properties > Thermal Properties
  • Platform Characteristics > Viewing Geometry
NOAA-11, NOAA-14, NOAA-16, NOAA-7, NOAA-9
Data Format(s):
  • Binary
Data Contributor(s): Jeffrey Key, Jim Maslanik, Ted Scambos, William Emery, Chuck Fowler, Terry Haran

Data Citation

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

W. Emery, C. Fowler, T. Haran, J. Key, J. Maslanik, T. Scambos 2000. AVHRR Polar Pathfinder Twice-Daily 5 km EASE-Grid Composites, Version 3. [indicate subset used]. Boulder, Colorado USA. NSIDC: National Snow and Ice Data Center. [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