AVHRR Data Sets

Currently, NSIDC is not distributing AVHRR Polar Pathfinder data sets due to errors in the data. If you have further questions, please contact NSIDC User Services by e-mail or telephone at +1 303.492.6199.

NSIDC maintains and distributes a variety of AVHRR data products, including a collection of AVHRR Polar Pathfinder data. We also use AVHRR Level-1B imagery to monitor developing melt ponds and ice sheet breakup in Antarctica. The tables below list these data offerings and provide links to order data and view documentation.

Title Spatial Coverage Temporal Coverage Spatial Resolution Temporal Resolution Parameter(s)

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

Dataset Summary

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.

Details

N: 90, S: 48.4, E: 180, W: -180


N: -53.2, S: -90, E: 180, W: -180

1981/07/24 to 2005/06/30 12 hour Albedo, Brightness Temperature, Cloud Amount/Frequency, Infrared Radiance, Land Surface Temperature, Skin Temperature, Thermal Infrared, Thermal Properties, Viewing Geometry, Visible Radiance

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

Dataset Summary

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. If you have further questions, please contact NSIDC User Services by e-mail at nsidc@nsidc.org or telephone at +1 303.492.6199.

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.

Note: NSIDC reccommends the use of the Extended AVHRR Polar Pathfinder (APP-x) Product instead of our AVHRR Polar Pathfinder Twice-Daily 25 km EASE-Grid Composites. The APP-x 25 km product has albedo and temperature calculations for all sky conditions. Cloud properties are modeled to estimate the albedo and temperature under the clouds. An improved cloud detection algorithm is also used in the APP-x product.

Details

N: 90, S: 48.4, E: 180, W: -180


N: -53.2, S: -90, E: 180, W: -180

1981/07/24 to 2000/12/31 12 hour Albedo, Cloud Amount/Frequency, Infrared Radiance, Land Surface Temperature, Skin Temperature, Thermal Infrared, Thermal Properties, Viewing Geometry, Visible Radiance

AVHRR Leads-ARI Polar Gridded Brightness Temperatures, Version

Dataset Summary

This data set consists of AVHRR imagery selected from hard copy 'quick
look' images to provide the best coverage possible over the Arctic
approximately every three days for a three-year period. Level-1B data
from NOAA/SDSD have been calibrated and mapped to earth locations,
then gridded to 1 km pixels on a basin scale to the polar stereographic
projection. The projection is similar to that used by NSIDC to produce
DMSP SSM/I polar brightness temperature and sea ice products. Each
image was ranked for areal coverage of particular seas and for degree
of cloud coverage. Passes covering a large area are generally favored over shorter passes with less cloud cover. The data set was developed
in support of the Office Of Naval Research Arctic Leads Accelerated
Research Initiative (Arctic Leads ARI). The aim of the Initiative was
to develop a more thorough understanding of the oceanography,
meteorology, and ice dynamics surrounding formation and evolution of
leads in sea ice. The leads ARI field experiment took place from March
to April 1992.

A spreadsheet containing the image rankings is available in hard copy
(NOARL Tech. Note 118, April 1991); paper copies of the spreadsheet
are available on request. Data set information is available
on-line. Data are available via FTP.

Details

N: 90, S: 60, E: 180, W: -180

1988/01/01 to 1989/12/31 Albedo, Brightness Temperature, Leads, Reflectance