Abstract: This dataset (along with Mapped GAC-Mercator) is the longest essentially continous and relatively homogeneous global product that has been produced from data collected by environmental satellites. The instruments were at first a vidicon camera system (visible data only) followed by an evolving series of scanning radiometers, including VHRR and AVHRR instruments. The MAPPED GAC data are mapped into ... arrays on Northern and Southern Hemisphere polar stereographic grids of varying size. Each element contains a visible (VIS) and/or infrared (IR) data value with a zenith angle or latitude correction applied. The contents have varied over the years as follows: 1. 1966-1972, ESSA-TOS AVCS 512 x 512 grid VIS only 2. 1972-1978, ITOS-Early NOAA SR 2048 x 2048 and 1024 x 1024 VIS and IR 3. 1979-Present, TIROS-N/NOAA AVHRR 1024 x 1024 VIS and IR. The mapped mosaics using a 1024 x 1024 grid provides 12.8 km resolution at the Equator decreasing to 25.6 km resolution near the poles. Resolution for other grids generally ranges from 25 km to 50 km. The mapped mosaics are of daytime visible and infrared and nighttime infrared.
To make a wide range of climatic data available to researchers and the public.
CURRENTNESS REFERENCE: Ground Condition
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