MODISL1DB Installation Instructions

MODISL1DB Manual Installation Instructions

Step

What To Do

How To Do It

In an xterm window, create a MODISL1DB root directory (name it anything you like), and enter that directory:

> mkdir modisl1db
> cd modisl1db

ftp the MODISL1DB tar files from the closest ftp mirror into your new SeaDAS directory:

USA:
samoa.gsfc.nasa.gov
(dir: seadas/modisl1db/modisl1db/)

> ftp samoa.gsfc.nasa.gov

anonymous

user@hostname

binary

cd seadas/modisl1b/modisl1b

get modisl1db_xxx.tar.gz (where xxx is your operation system)

get seadas_dem_modis.tar.gz (optional for geolocation terrain correction)

get seadas_demo_modis_db.tar.gz (optional Level 0 test file)

quit

Uncompress and extract all the SeaDAS tar files:

> gunzip -c modisl1db_xxx.tar.gz | tar xvpf -
> gunzip -c seadas_dem_modis.tar.gz | tar xvpf - > gunzip -c seadas_demo_modis_db.tar.gz | tar xvpf -

To conserve disk space, you may now want to delete the *.gz files:

> rm *.gz

Depending on your shell, add the following lines to your .cshrc, .tcshrc, or .bashrc file, where "PATH_TO_MODISL1DB" is the full directory path of your MODISL1DB directory (e.g. /home/zaphod/modisl1db):

bash shells:
export DBHOME=PATH_TO_MODISL1DB
source $DBHOME/scripts/modisl1db_env.bash
ulimit -Ss unlimited (add this line for OS X only)

csh/tcsh shells:
setenv DBHOME PATH_TO_MODISL1DB
source $DBHOME/scripts/modisl1db_env.csh
limit stacksize unlimited (add this line for OS X only)

*source* the init file you just modified:

> source ~/.bashrc (for bash shells)
> source ~/.cshrc (for csh and some tcsh shells)
> source ~/.tcshrc (for some tcsh shells)

The MODISL1DB installation is now complete and you can execute one of the 4 main wrapper scripts to process your data:

> modis_L0_to_L1A_GEO.csh   L0_PDS_file
> modis_L1A_extract.csh   -help
> modis_L1A_to_GEO.csh   L1A_file
> modis_L1A_to_L1B.csh L1A_file   GEO_file

It is also recommended that you set up a weekly cronjob to download new utcpole.dat and leapsec.dat files (modis_update_utcpole_leapsec.csh) and a daily cronjob to check for new calibration LUTs (modis_update_luts.csh). Remember to invoke a shell to run the scripts within cron in order to set the MODISL1DB environment variables. Example crontab lines for csh shell installations:

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

> crontab -e

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