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Use Rrs_nnn instead of Rrs_vvv as in "Kd_490 Rrs_nnn angstrom aot_865 chlor_a" for l2prod in the Selected Products tab.

I used V2023.3 for the Science Processors (OCSSW)

If you are using SeaDAS 8.4.0, I believe the right command is find_matchup and make_matchup. Here are the help pages -- https://seadas.gsfc.nasa.gov/help-8.4.0/FieldMeasurements/FindMatchups.html https://seadas.gsfc.nasa.gov/help-8.4.0/FieldMeasurements/MakeMatchups.html Could you please try /Users/...

Here is an example of using L1B files as a list -- 1) multilevel_processor-forum-L1B.par looks like this -- [main] ifile=/Users/USERNAME/Scenes/MODIS_AQUA/forum/ifile_L1B_forum_11_02_23.txt use_ancillary=1 overwrite=1 [l2gen] aer_opt=-3 2) ifile_L1B_forum_11_02_23.txt looks like this /Users/USERNAME...

Here is an example of using L1A files as a list -- 1) multilevel_processor-forum-L1A.par looks like that [main] ifile=/Users/USERNAME/Scenes/MODIS_AQUA/forum/ifile_forum_11_02_23.txt use_ancillary=1 overwrite=1 [l2gen] aer_opt=-3 2) ifile_forum_11_02_23.txt looks like this -- /Users/USERNAME/Scenes/...

L2 needs an L1B file + GEO file as input If /Users/sawyerduan/Downloads/vim is a list of L1B files, they have to follow the OBPG File Naming Convention https://oceancolor.gsfc.nasa.gov/resources/docs/filenaming-convention/, such as AQUA_MODIS.20231014T060500.L1B.hdf, with the corresponding GEO file ...

The file not found is: /Users/sawyerduan/seadas/ocssw/var/common/tai-utc.dat

Try Hope this post helps -- viewtopic.php?t=3184

l2gen ifile=/Users/sawyerduan/Downloads/MYD021KM.A2023289.0550.061.2023290134619.hdf geofile=/Users/sawyerduan/Downloads/MYD03.A2023289.0550.061.2023289210348.hdf l2prod="Rrs_vvv a_vvv_carder adg_vvv_carder aph_vvv_carder bbp_vvv_carder cloud_albedo nLw_1240 nLw_1640 nLw_2130 nLw_748 nLw_859 n...

You are on target.

Can you do and share the result here?

Is your Mac with M1/M2 chip? If so, you need take extra steps to set up the environment in order to run l2gen https://seadas.gsfc.nasa.gov/downloads/

Or you can try to run l2gen using Client Server model (docker is recommended)

You can try SeaDAS' BandMaths Tool to create new bands using avg() and/or stddev() functions. https://seadas.gsfc.nasa.gov/help-8.4.0/desktop/BandMaths.html The expression editor for avg() looks like this Screenshot 2023-10-26 at 12.52.50 PM.png If you want to do BandMaths on many files, you can try...