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It seems to me that you had ocssw installed in /Users/paul/seadas/ocssw from SeaDAS 7.5, and then had it overwritten when you "Install/Update OCSSW" through SeaDAS 8.0. Now you have two versions of ocssw mixed in that /Users/paul/seadas/ocssw directory. You might want to delete /Users/paul...

Could you do "SeaDAS_OCCSW -> SeaDAS/System Info" and share the output here? Did you install ocssw through SeaDAS 8.0.0? It seems to me that you are running getanc.py from the old ocssw you installed through SeaDAS-7.5.3. Can you try to find the ocssw you installed through SeaDAS 8.0.0, ge...

If you do "ncdump -h A20202752020305.L3m_MO_KD490_Kd_490_4km.nc", you will find there are a few global attributes with null value. For example, "ofile", "width" and etc in "input_parameters" group. There is a bug in SeaDAS 8.0.0 that reading such a file will f...

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I can open L2 file A2020283185000.L2_LAC_OC.nc
but not A20202752020305.L3m_MO_KD490_Kd_490_4km.nc due to null global attribute value, which is a known issue.

It might be helpful if you let us know what files you have trouble to open. Are they MODIS or VIIRS files? L2, L3b or L3m? SeaDAS 8.0.0 is a beta version, we do have some known issues and the fix will be in the next release. In the meantime, you can try SeaDAS-7.5.3: https://oceandata.sci.gsfc.nasa....

I downloaded all the KD_490 files you listed and was only able to open and display two of them A20040922004121.L3m_MO_KD490_Kd_490_4km A20112742011304.L3m_MO_KD490_Kd_490_4km. It's a known issue for SeaDAS 8.0.0 in reading files with null value attributes in metadata. The fix will be in the next rel...

Did you install SeaDAS 8.0.0 on Windows? Can you do "SeaDAS-OCSSW -> SeaDAS/System Info" and share the output here?

Please let us know if you are running SeaDAS 7.5.3 or SeaDAS 8. Also, what operating system do you have?

According to the 2019 post: https://forum.earthdata.nasa.gov/viewtopic.php?f=7&t=1759&p=5659&hilit=LANDSAT+7&sid=876582abaa0bbc82dad74fa4ffc96b44#p5659 The l2gen code *does* have support for Landsat 5 & 7 - but it may not be fully baked, so we've not really advertised it. In fact...

Here is the link to the help pages of SeaDAS 8: https://seadas.gsfc.nasa.gov/help/8.0.0/ If you click -> SeaDAS TOolbox -> OCSSW -> multilevel_processor -> Command Line Usage, you 'll find the help for multilevel_processor's command line usage: https://seadas.gsfc.nasa.gov/help/8.0.0/processors/Proc...