Atmospheric Correction in HICO

[vimal459]

Hi,
In seadas7.4, I want know the atmospheric correction method such as Aerosol, Cloud, Rayleigh, Glint, and etc used for HICO processing. And where i can find the algorithm of mentioned atmospheric correction used in seadas?

[OB.DAAC - SeanBailey]

See: https://oceancolor.gsfc.nasa.gov/atbd/rrs/ and references therein

Sean

[vimal459]

Thank you  SeanBailey, I would like to learn how the algorithm are implemented in Seadas. I'm facing difficulties while trying to understand the atmocor1, atmocor2, rayleigh phase function, and etc. is there any technical document available ? and which algorithm implemented in seadas for rayleigh (rayleigh.c) ?

regards
Vimal

[OB.DAAC - SeanBailey]

Vimal,

The l2gen code is indeed quite complex.  It's not a simple "which algorithm is implemented" question, as that depends upon how the code was called.  It is highly configurable.
There is no technical document about the code, other than the code itself.

Sean

[vimal459]

Sean,
i'm trying to understand using the l2gen code. Particularly in Rayleigh part, mentioned Wang pressure correction, rest of the part i couldn't able to understand. it would be very helpful if you could provide something (algorithm implemented/paper ref) to understand.

Thanks & regards
Vimal

[OB.DAAC - SeanBailey]

As I see it, there are three ways to interpret your request.1) Understanding the options available when running the l2gen binary.For that, take a look at the associated  SeaDAS help page. 2) Understanding the algorithms implemented within the l2gen code.For that, the recently published document "Atmospheric Correction for Satellite Ocean Color Radiometry" and the associated Web Book on Atmospheric Correction are the most comprehensive references on the subject3) Understanding the l2gen code itself.Fire up a nice integrated development environment tool and load the ocssw source into it and prepare for a long night (... or month, or decade...), might want to grab a tall mug of coffee before you get started...Sean

[siggy_12]

I have installed seadas 7.4 and trying to install oc processors manually by installing all the repository from https://oceandata.sci.gsfc.nasa.gov/. I have given the command:user@user-Inspiron-3537:~$ ./install_ocssw.py --local=$HOME/seadas_downloads -b  v7.4Installing bundles.sha256sum (1 of 7)Installing common (2 of 7)Not updating Git Repository, no-update requestedInstalling OCSSW_bash.env (3 of 7)cp: cannot stat ‘/home/suresh/seadas_downloads/OCSSW_bash.env.v7.4’: No such file or directoryError - Executing command "cp /home/suresh/seadas_downloads/OCSSW_bash.env.v7.4 /home/suresh/ocssw"Traceback (most recent call last):  File "./install_ocssw.py", line 624, in <module>    os.rename(os.path.join(installDir, 'OCSSW_bash.env.' + gitBranch), os.path.join(installDir, 'OCSSW_bash.env'))OSError: [Errno 2] No such file or directorysuresh@suresh-Inspiron-3537:~$ ./install_ocssw.py --local=$HOME/seadas_downloads -b  v7.4Installing bundles.sha256sum (1 of 7)Installing common (2 of 7)Not updating Git Repository, no-update requestedInstalling OCSSW_bash.env (3 of 7)Installing ocrvc (4 of 7)Cloning into '/home/suresh/ocssw/run/data/ocrvc'...Receiving objects: 100% (23/23), done.Resolving deltas: 100% (7/7), done.Checking connectivity... done.Not updating Git Repository, no-update requestedInstalling bin (5 of 7)Cloning into '/home/suresh/ocssw/run/bin/linux_64'...Receiving objects: 100% (1077/1077), 648.92 MiB | 29.60 MiB/s, done.Resolving deltas: 100% (899/899), done.Checking connectivity... done.Not updating Git Repository, no-update requestedInstalling bin3 (6 of 7)Not updating Git Repository, no-update requestedInstalling scripts (7 of 7)Cloning into '/home/suresh/ocssw/run/scripts'...Receiving objects: 100% (564/564), 276.10 KiB | 0 bytes/s, done.Resolving deltas: 100% (409/409), done.Checking connectivity... done.Not updating Git Repository, no-update requestedPython version acceptableAfter having installed everything manually. How do i get the dataprocessing option on my seadas.I want to process modis data

[OB SeaDAS - knowles]

siggy_12

You should consider making new threads instead of posting new unrelated topics under existing threads.  By making your own thread, you can give the thread a name which directly relates to the question you are asking.  Not only will this help people notice and answer your post, but when your post is answered, it will help other users with the same questions find the answers.

In your seadas home directory {$SEADAS_HOME} edit the file $SEADAS_HOME/config/seadas.config

Find and set the following line to your ocssw root location:
seadas.ocssw.root = /home/suresh/ocssw

Danny

[OB SeaDAS - dshea]

Is there a reason you are not installing OCSSW using the GUI?

I just changed a few things in preparation for the SeaDAS 7.5 release.  You need to download the file:

https://oceandata.sci.gsfc.nasa.gov/ocssw/OCSSW_bash.env.v7.4
to:
/home/suresh/seadas_downloads

$ ./install_ocssw.py --local=$HOME/seadas_downloads -b  v7.4
(assuming OCSSWROOT is already set to  /home/suresh/ocssw)

Then you need to launch seadas
select menu OCSSW -> Install OCSSW Processors
set Local Install-dir to /home/suresh/ocssw
click the Run button

don