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From your SeaDAS/System Info printout, ... Application Version: SeaDAS 8.0.0 (Beta) ... l2gen version: msl12 9.5.1-V2021.2 (Jun 18 2021 11:22:53) ... it seems that you didn't restart SeaDAS after the updating and that you have OCSSW V2021.2 installed. Please quit SeaDAS and restart it. After that, t...

I tested l2gen (V2021.2) on A2013067094500.L1B_LAC, and it seems to work fine.

What version of SeaDAS and what tag of OCSSW were you using when everything worked fine?

What did you do when you "updated SeaDAS"?

LUTs files on our site -- https://oceandata.sci.gsfc.nasa.gov/Ancillary/LUTs/

LUTs files in the SeaDAS/ocssw code -- $OCSSWROOT/var

Not sure if these are what you are looking for

It’s a calibration issue. We don’t have gains for L7 (so unity values are used). As a result, this scene has negative rhos. We do not provide the calibration adjustments that would be necessary to get valid retrievals, but you can see if this paper helps: https://doi.org/10.3390/rs10091337 Attached ...

Are you trying to do l2gen on Sentinel 2 data?

With l2gen, you can define the area of interest in the processing tab, but I don't think you can set resolution for data other than modis.
https://seadas.gsfc.nasa.gov/help-8.0.0 ... L2gen.html

Here is direct access to MODIS AQUA Data --https://oceandata.sci.gsfc.nasa.gov. (/directaccess/MODIS-Aqua/) or you can use the Level 1& 2 Browser -- https://oceancolor.gsfc.nasa.gov (/cgi/browse.pl?sen=amod) If you are not familiar with SeaDAS or NASA OB.DACC, here is an intro -- https://seadas....

In SeaDAS 7, modis_GEO.py and getanc.py are in $OCSSWROOT/scripts, and anc_utils.py is in $OCSSWROOT/scripts/modules. In SeaDAS 8, modis_GEO and getanc are in $OCSSWROOT/bin, anc_utils.py is in $OCSSWROOT/bin/seadasutils. It seems to me you are running modis_GEO.py in SeaDAS 7 on command line. I won...

In SeaDAS l2gen GUI, click Processing Option tab, you can toggle "atmocor" on -- https://seadas.gsfc.nasa.gov/help-8.1.0/processors/ProcessL2gen.html#PROCESSING_OPTIONS_TAB

Here is more regarding aer_opt: https://oceancolor.gsfc.nasa.gov (/forum/oceancolor/topic_show.pl?tid=7026)

Chlor_a is available in L2 data - https://oceandata.sci.gsfc.nasa.gov. (/directaccess/MODIS-Aqua/L2/) You can also use SeaDAS to process MODIS AQUA L1A data to L2: modis_GEO: L1A -> geo https://seadas.gsfc.nasa.gov/help-8.1.0/processors/ProcessModis_GEO.html ModiS_L1B: L1A + geo - > L1B https://sead...