NOAA KLM User's Guide
Section 8.3.1.4
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8.3.1.4 GAC Data Sets
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, was implemented for all operational POES spacecraft. There is no
plan at this time to reprocess archived data into the new format. On January 25, 2006, Version 4 (v4) was implemented to reflect the
start of CLAVR-x (Cl ouds from AV HR R E x tended cloud mask) processing which began on that date. On
November 14, 2006, Version 5 (v5) was implemented for the LAC/HRPT only. The GAC version number remains at 4.
Amended April 5, 2004
Amended January 4, 2005
Amended April 12, 2005
Amended May 4, 2005
Amended December 7, 2006