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AVHRR Polar Pathfinder (APP)

Sample image of NOAA CDR AVHRR Polar Pathfinder product. It depicts reflectance of elements over the Northern Hemisphere, north of 48.4 degrees latitude.

This dataset provides advanced scientific researchers a high quality Climate Data Record (CDR) of Advanced Very High Resolution Radiometer (AVHRR) Polar Pathfinder (APP).

This NOAA Climate Data Record (CDR) contains the AVHRR Polar Pathfinder (APP) product. APP is a fundamental CDR comprised of calibrated and navigated AVHRR channel data (reflectances and brightness temperatures), viewing and illumination geometry (sensor scan angle, solar zenith angle, and sun-sensor relative azimuth angle), Universal Coordinated Time (UTC) of the data acquisition, and a surface type mask. The data are twice daily composites of up to 23 orbits on a 5 km Equal-Area Scalable Earth (EASE)-Grid twice daily over both poles, the Arctic and Antarctic, from 1982 to the present. The daily APP composites are centered on local solar times of 14:00 (high sun, but could be nighttime for some polar areas in winter) and 04:00 for the Arctic or 02:00 for the Antarctic. The APP covers the north polar region (Arctic) from 48.4 degrees northward, and the south polar region (Antarctic) from -53.2 degrees southward.

Principal Investigator: Jeffrey Key, University of Wisconsin

Cite dataset when used as a source. See the dataset's DOI landing page for citation details at doi:10.7289/V5BC3WHM.

Note: Due to a known issue, AVHRR Polar Pathfinder (APP) and its extended version (APP-x) will not properly aggregate in time using software tools. For more details and an interim fix, see the associated Technical Note.