Get Data

NSIDC does not archive this data.
Data Set ID:

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

This data set is no longer available because of errors in the data. See the Error Sources section of the data set documentation for details.

NSIDC recommends using the Extended AVHRR Polar Pathfinder (APP-x) data set instead.

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.

Geographic Coverage

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

  • N: -53.2, S: -90, E: 180, W: -180

Spatial Resolution: Not Specified
Temporal Coverage:
  • 24 July 1981 to 31 December 2000
Temporal Resolution: 12 hour
  • Atmospheric Radiation > Albedo
  • Snow/Ice > Albedo
  • Surface Radiative Properties > 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
Platform(s) NOAA-11, NOAA-14, NOAA-7, NOAA-9
Data Format(s):
  • Binary
Version: V1
Data Contributor(s): Chuck Fowler, Jim Maslanik, Terry Haran, Ted Scambos, Jeffrey Key, William Emery
Please contact the data provider for the correct Data Citation for this data set.
No technical references available for this data set.