CDOM retrievals with SeaDAS from ACOLITE derived Rrs

[davouris.ucmerced]

Hi! I want to calculate a standard CDOM product from an Sentinel 2 image using the Rrs output from ACOLITE. I am comparing my own retrievals with standard products. Is this possible? Can I import an ACOLITE output .nc file with Rrs bands and run that through the OCSSW processors to obtain a CDOM retrieval? If so, what is the workflow?

I have spent quite a bit of time looking for the l2gen format so I can use that template for my ACOLITE output, but am not finding it anywhere. Is there a guide for this?

Thank you,
Dulci

[OB General Science - guoqingw]

Hi Dulci,

Which CDOM product are you referring to?
I'm not sure how ACOLITE handles Rrs outputs and whether they are consistent with NASA standard products.

SeaDAS help page of l2gen:
https://seadas.gsfc.nasa.gov/help-8.2.0/processors/ProcessL2gen.html

Guoqing

[davouris.ucmerced]

Hi,

I am looking for the adg product. I guess my question is - can I use SeaDAS to calculate that from a L2 product generated through a different atmospheric processing software, or can I only retrieve the adg product if I use SeaDAS to process a L1C image to L2? And what wavelength is that adg calculated for? 440? 490?

I want to compare my implementation of the adg retrieval of Lee et al 2002 from the ACOLITE Rrs to the SeaDAS implementation of the same thing. It's just a sanity check on my calculations.

If I can't actually do this without a huge amount of work trying to get my output into the needed format for SeaDAS, that is fine. I just can't figure out if it is even possible. The documentation is really hard to find & there are still a lot of dead ends in the website.

thanks,
Dulci

[OB General Science - guoqingw]

Dulci,

Unfortunately, you can only use OCSSW l2gen to produce adg from level 1 data (l1c for sentinel 2).
Here is the algorithm description for IOP including adg443:
https://oceancolor.gsfc.nasa.gov/atbd/giop/