Pygac reads AVHRR GAC (Global Area Coverage), LAC (Local Area Coverage) and FRAC (Full Resolution Area Coverage) level 1b data from NOAA, which is described in the POD (NOAA-14 and before) and KLM (NOAA-15 and following) user guides. The data can be obtained from NOAA CLASS, where you can also find a comprehensive introduction.
Note
Pygac can only read AVHRR data with 10 bits/pixel. This can be specified in your NOAA CLASS order or user preferences (see screenshot below).
Pygac currently supports AVHRR generations 1-3 onboard NOAA (TIROS-N, NOAA-6 and onwards) and MetOp satellites.
- pygac-fdr: Generate a fundamental data record of AVHRR GAC data using Pygac.
- level1c4pps: Prepare AVHRR GAC data for NWCSAF/PPS using Pygac.