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Introduction
============
Supported Data Format
---------------------
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).
.. image:: images/noaa_class_preferences.png
:width: 350
:alt: Screenshot of AVHRR data extraction preferences
.. _NOAA CLASS:
https://www.class.noaa.gov/
.. _POD:
https://www.ncei.noaa.gov/pub/data/satellite/publications/podguides/TIROS-N%20thru%20N-14/
.. _KLM:
https://www.ncei.noaa.gov/pub/data/satellite/publications/podguides/N-15%20thru%20N-19/
.. _introduction:
https://www.class.noaa.gov/release/data_available/avhrr/index.htm
Supported Sensors
-----------------
Pygac currently supports AVHRR generations 1-3 onboard NOAA (TIROS-N, NOAA-6
and onwards) and MetOp satellites.
.. _here:
https://www.avl.class.noaa.gov/release/data_available/avhrr/index.htm
Related Projects
----------------
- `pygac-fdr`_: Generate a fundamental data record of AVHRR GAC data using
Pygac.
- `level1c4pps`_: Prepare AVHRR GAC data for `NWCSAF/PPS`_ using Pygac.
.. _level1c4pps: https://github.com/foua-pps/level1c4pps
.. _NWCSAF/PPS: https://www.nwcsaf.org/16
.. _pygac-fdr: https://github.com/pytroll/pygac-fdr
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