Data Set ID:

AVHRR Polar Pathfinder Twice-Daily 25 km EASE-Grid Composites, Version 1

NOTE: This data set is no longer available due to errors in the data. It has been superseded by the Extended AVHRR Polar Pathfinder (APP-x) data set available at:

The following information is provided for provenance:
The AVHRR Polar Pathfinder Twice-Daily 25 km EASE-Grid Composites are a collection of products for both poles, consisting of twice-daily gridded and calibrated satellite channel data and derived parameters. Data include five Advanced Very High Resolution Radiometer (AVHRR) channels, clear sky surface broadband albedo and skin temperature, average albedo and temperature, valid fraction file, solar zenith angle, satellite elevation angle, sun-satellite relative azimuth angle, surface type mask, cloud mask, cloud fraction files, and Universal Coordinated Time (UTC) of acquisition. The 25 km data are derived from the AVHRR Polar Pathfinder Twice-Daily 5 km EASE-Grid Composites, and extend poleward from 48.4 degrees north and 53.2 degrees south latitudes, spanning July 1981 through December 2000. Data are in 1-byte and 2-byte integer grid format and are available by FTP.

  • Surface Radiative Properties > Albedo
  • Snow/Ice > Albedo
  • Atmospheric Radiation > Albedo
  • 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
  • Visible Wavelengths > Visible Radiance
Data Format(s):
  • Binary
Spatial Coverage:
N: -53.2, 
N: 90, 
S: -90, 
S: 48.4, 
E: 180, 
E: 180, 
W: -180
W: -180
Platform(s):NOAA-11, NOAA-14, NOAA-7, NOAA-9
Spatial Resolution:Not SpecifiedSensor(s):AVHRR
Temporal Coverage:
  • 24 July 1981 to 31 December 2000
Temporal Resolution12 hourMetadata XML:View Metadata Record
Data Contributor(s):Chuck Fowler, Jim Maslanik, Terry Haran, Ted Scambos, Jeffrey Key, William Emery

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.

C. Fowler, J. Maslanik, T. Haran, T. Scambos, J. Key, and W. Emery. 2002. AVHRR Polar Pathfinder Twice-Daily 25 km EASE-Grid Composites, Version 1. [Indicate subset used]. Boulder, Colorado USA. NSIDC: National Snow and Ice Data Center. doi: [Date Accessed].

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