SeaDAS| Step | What to do | How to do it |
|---|---|---|
| 1. | In an xterm window, create a MODISL1DB root directory (name it anything you like), and enter that directory: | > mkdir modisl1db > cd modisl1db |
| 2. | ftp the MODISL1DB tar files from the closest ftp mirror into your new SeaDAS directory: U.S.A. samoa.gsfc.nasa.gov (dir: seadas/modisl1db/modisl1db/) |
> ftp samoa.gsfc.nasa.gov anonymous user@hostname binary cd seadas/modisl1b/modisl1b ls get modisl1db_xxx.tar.gz (where xxx is linux, macintel, or macppc) get seadas_dem_modis.tar.gz (optional for geolocation terrain correction) get seadas_benchmarks.tar.gz (optional benchmark script and Level 0 Aqua file) quit |
| 3. | 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_benchmarks.tar.gz | tar xvpf - |
| 4. | To conserve disk space, you may now want to remove the *.gz files: | > rm *.gz |
| 5. | 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 last line for OS X only) csh/tcsh shells: setenv DBHOME PATH_TO_MODISL1DB source $DBHOME/scripts/modisl1db_env.csh limit stacksize unlimited (add this last line for OS X only) |
| 6. | *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) |
| 7. | 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 |
| 8. | 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 |
