This section describes the characteristics and formats of Global Area Coverage (GAC) data sets
for both NOAA KLM (version 2) and NOAA-N (version 3) satellites. Version 2 formats (v2) were
used on all NOAA KLM data until April 28, 2005. After this date, the version 3 format
(v3), also known as the NOAA-N format, will be implemented for all operational POES
spacecraft. There is no plan at this time to reprocess archived data into the new format.