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Where did you get your L1A files?

Can you do the following command and see if ASSOCIATEDPLATFORMSHORTNAME is in the metadata of your L1A file?

I am assuming you are using SeaDAS 8.1.0. What tag of OCSSW are you using? You can run the following command and post the result here.
Please also share the name of your L1A file(s).

Can you show me the image of the 4 L2 files you created through the modis_GEO -> modis_L1B -> l2gen step by step process instead of through multilevel_processor? A2004291221000.L2_LAC_OC.x.hdf A2004292211500.L2_LAC_OC.x.hdf A2004003203000.L2_LAC_OC.x.hdf A2004001204500.L2_LAC_OC.x.hdf Here is the he...

I also attached the image of the 4 corresponding L2 files downloaded from https://oceandata.sci.gsfc.nasa.gov A2004291221000.L2_LAC_OC.nc A2004292211500.L2_LAC_OC.nc A2004003203000.L2_LAC_OC.nc A2004001204500.L2_LAC_OC.nc The geographic area looks consistent with the L2 files generated by multilevel...

I tried multilevel_processor GUI with your setting, with the content of _inputFiles.lst as following -- corresponding to the files 119, 120, 121 and 122 on your attached image: /Users/***/Scenes/MODIS_AQUA/forum/A2004291221000.L1A_LAC /Users/***/Scenes/MODIS_AQUA/forum/A2004292211500.L1A_LAC /Users/...

Please change your script to call /home/andy/ocssw/bin/modis_GEO You can also do export OCSSWROOT=/home/andy/ocssw source $OCSSWROOT/OCSSW_bash.env and then call $OCSSWROOT/bin/modis_GEO in your script You need to add the following lines to your .bashrc file to configure your command line environmen...

You can try to extract the L1A file to your region of interest, generate a geolocation file for the extracted L1A file, and then process the extracted L1A/GEO data with l2gen using the same par file content except the north/south/east/west options

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. You need to call $OCSSWROOT/bin/modis_GEO rather than modis_GEO.py What was th...

I did modis_GEO, modis_L1B and l2gen step by step on A2004006210000.L1A_LAC and created A2004006210000step.L2_LAC_OC And I tried multilevel_processor GUI with your setting(with A2004006210000.L1A_LAC being the context of _inputFiles.lst), and created A2004006210000mlp.L2_LAC_OC. This is Rrs_469 in A...

Please let us know a few things so we can replicate the error:

1. what version of SeaDAS and what tag of OCSSW you are using.
2. the name of an L1A file you processed
3. the input settings for the processors if not default
4. command line or GUI