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                   Help notes for update_luts.py
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Usage: 
    update_luts.py [OPTIONS] MISSION

    MISSION is either seawifs, aqua, terra, or aquarius

Options:
  --version      show program's version number and exit
  -h, --help     show this help message and exit
  -v, --verbose  print status messages

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The update_luts.py script compares local MODIS L1B calibration LUTs to those on
an ftp server, and downloads newer remote LUTs if they are found. This script
can be run as a cronjob or manually, to keep LUTs up-to-date.

It is recommended to run this script as a daily cronjob. Remember to invoke a
shell to run the script within cron in order to set the MODISL1DB environment
variables. Example daily crontab lines for csh shell users:

0 0 * * * /bin/csh -c "/path_to_scripts/modis_update_luts.py aqua"
0 0 * * * /bin/csh -c "/path_to_scripts/modis_update_luts.py terra"

The default location of the calibration LUTs are: 
$SEADAS/run/var/modisa/cal/OPER (Aqua)
$SEADAS/run/var/modist/cal/OPER (Terra)  

It is MANDATORY that all three LUTS (reflective, emissive, and qa) reside in
the same directory.

When run with either aqua or terra as the mission, the utcpole.dat and
leapsec.dat files are also updated.

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Explanation of command line arguments:
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satellite_name (required)
Specify the satellite as either "aqua" or "terra" (case-insensitive).

-quiet (optional)
No messages are printed to stdout unless a newer LUT is found on the
remote server or an error occurs.

-disable-download (optional)
Disable the automatic download feature of new LUTs from the ftp server.

--verbose (optional)
Enable verbose output messages for all LUT downloads.

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