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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...

l2gen needs an L1 file as the input (e.g. LC08_L1TP_015033_20220329_20220406_02_T1_MTL.txt)

I just tried seadas-8.4.0 on an old mac (Monterey 12.6.5). It works fine.

Make sure you don't have another copy of SeaDAS opened. And this might help

I don't know about ODV software, but I know SeaDAS cannot read l3b files. https://seadas.gsfc.nasa.gov/ However, if you use l3mapgen tool to turn l3bin files into l3m files, SeaDAS can read it. https://seadas.gsfc.nasa.gov/help-8.4.0/processors/ProcessL3mapgen.html Or you can download and read the e...