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It turns out I am able to do l2gen on the MSI_S2A file you provided and created an L2 file with valid Rrs data

Yes, it's a known bug. For resolution=250, 500, the work around is to do l1aextrract_modis first and the do l2gen without subset.

Here is a post that might be helpful -- viewtopic.php?p=11063&hilit=l2gen#p11029

You don't need to alter anything if you want to do l2gen on GUI with default values. However, if you want to do l2gen with "Multi-scattering with MUMM correction and MUMM NIR calculation", you need to choose "-10: Multi-scattering with MUMM correction and MUMM NIR calculation" fo...

Please share what version of SeaDAS and what tag of SeaDAS Science Processing Package (OCSSW) you are using. Please also share the name of your L1A file, so we can try to replicate the error.

Thanks George for pointing out the difference between the average of geophysical parameters and the math average. Hope I get it right this time -- ((chlor_a_M >= 0.0 ? chlor_a_M : 0) +( chlor_a_D0 >= 0.0 ? chlor_a_D0 : 0) + (chlor_a_D1 >= 0.0 ? chlor_a_D1 : 0)) / (((chlor_a_M >= 0.0 ? 1 : 0) + (chlo...

I used the expression you gave and I got a full white image with NaN pixels. Should I do chlor_a < 0 instead of chlor_a > 0? It should be chlor_a > 0 Make sure your files are opened as [1], [2], [3], when you use the example expression. Here is the screenshot of BandMath GUI. Make sure you uncheck ...

Yes. Here is the content of myGraph.xml -- <graph id="Graph"> <version>1.0</version> <node id="Read"> <operator>Read</operator> <sources/> <parameters class="com.bc.ceres.binding.dom.XppDomElement"> <useAdvancedOptions>false</useAdvancedOptions> <file>/Users/bingyang/Sc...

If you open 3 L3m files in GUI, you can use the Math Band with the following expression to calculate the chlor_a_mean for the 3 files (($1.chlor_a > 0.0 ? $1.chlor_a : NaN) + ($2.chlor_a > 0.0 ? $2.chlor_a : NaN) + ($3.chlor_a > 0.0 ? $3.chlor_a : NaN)) / 3.0 Screen Shot 2023-02-08 at 11.10.51 AM.png

If you can use /usr/local/bin/python3 for SeaDAS, it might be easier just to do .
Otherwise add to your bash or zsh file, start a new terminal, and start SeaDAS in that terminal.

That's interesting. I can't replicate the error you've got. Can you do SeaDAS-Toolbox -> SeaDAS/System Info and post it here? 1. Try to run l2gen without ancillary files after deleting /root/SeaDAS/ocssw/var/anc/2023/021 2. Try to run l2gen with freshly downloaded ancillary files after clicking &quo...