Rayleigh scattering calculation

[Roman SvK]

Hallo All,

I am new user , and I need help about rayleigh scattering calculation for  goes 16 sat. ,

I have ready these things satellite view zenith angle, the solar zenith angle, and the satellite-sun azimuth difference angle and  I downloaded pyspectral_rayleigh_correction_luts.tgz ,

How I can application LUTs values to satellite reflectance values?

I need any formula how do to it.

Thanks for help

[Adam Dybbroe]

Roman,

Did you yet check the Pyspectral documentation? Here about the atmospheric correction in the visible part of the spectra:

https://pyspectral.readthedocs.io/en/latest/rayleigh_correction.html

With Pyspectral you can derive directly the reflectance correction (to be subtracted from the observed reflectance) given the satellite-sun viewing angles as you mention. There is no need to download the LUTs from Zenodo separately, Pyspectral does this for you behind the scene.

You may also have a go at Satpy to read and manipulate satellite data. Satpy use Pyspectral under the hood.

-Adam

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[Roman SvK]

thanks for the answer, Adam, I work in c#, not in python, I build my own code 

Dňa ut 29. 11. 2022, 20:11 Adam Dybbroe <adam.d...@smhi.se> napísal(a):

To view this discussion on the web, visit https://groups.google.com/d/msgid/pytroll/36fbb4d1-1a49-2f0a-e1b7-5869155617c5%40smhi.se.

[Raspaud Martin]

Hi Roman,

In the documentation page provided by Adam for pyspectral you will find
a link to a scientific paper describing the theory and formulas behind
the correction.

If you want to use the look up tables, I'm afraid there is no
instructions for it at the moment, but you can have a look at the
pyspectral source code for more info:
https://github.com/pytroll/pyspectral/blob/main/pyspectral/rayleigh.py

Best regards,
Martin

[Roman SvK]

Thanks for answer Martin,
I get value for rayleight correction, and now I understand correctly rayleight value i substract from reflectance value ?

Dátum: streda 30. novembra 2022, čas: 8:48:28 UTC+1, odosielateľ: Raspaud Martin

[Raspaud Martin]

On Thu, 2023-01-12 at 08:33 -0800, Roman SvK wrote:
> Thanks for answer Martin,
> I get value for rayleight correction, and now I understand correctly
> rayleight value i substract from reflectance value ?
>

Yes,this is correct!

Best regards,
Martin