Radiometric conversion of sentinel 2 images

[adhwa]

Hi Fifauzan,
Thank you for the explanation. I think I know what to do now.
Regards,

[ELHACHIMI]

Hello @fifauzan ,

Please, can i do the atmospheric correction with the ENVI software with Flaash algorithm

thank you in advance.

[fifauzan]

Hi @ELHACHIMI ,
Sorry for the late reply. This paper might help: https://www.researchgate.net/publication/307959143_Comparison_of_Physically_and_Image_Based_Atmospheric_Correction_Methods_for_Sentinel-2_Satellite_Imagery?ev=prf_high

[ELHACHIMI]

Hi @fifauzan,
Thank you very much for your help, this is a very important job for me, and this work will help me a lot .

[ELHACHIMI]

Hello @safah_94 ,
Yes my email is elhachimijaouad@gmail.com

[saf_94]

elhachimijaouad@gmail.com

@ELHACHIMI ok thanks. please looked your email

[saf_94]

Hello all. . .

Has anyone ever processed Sentinel 2A using ENVI software ???

[marpet]

Maybe you ask this in the support forum of ENVI?
http://harrisgeospatial.com/Support/Forums.aspx

[saf_94]

okk. . . thank u @marpet

[annaxh]

Thank you very much kiryl23

[leihui]

According to the technical document ‘S2-PDGS-MPC-ATBD-1’, the computation of rTOA follows the equation:

where there is an absolute calibration coefficient named A_k;NTDI.
But it seems to be no such constant parameter in your converting equation ?

Would you please tell the reason ?
If this coefficient equals to 1, it should be omitted other than given out in the workflow equation.

Thank you so much !

[leihui]

@leihui

According to the technical document ‘S2-PDGS-MPC-ATBD-1’, the computation of rTOA follows the equation:

where there is an absolute calibration coefficient named A_k;NTDI.
But it seems to be no such constant parameter in your converting equation ?

Would you please tell the reason ?

Or could you please explain why this constant coefficient is omitted when rTOA is converted to LTOA ?
Thank you so much ~ !

[Igor]

Hello!
Unfortunately, certain pages on the network are no longer available.
But there is code and an explanation in the comments.
For example, you can see the calculation available here:

Method ReflectanceToRadianceOp.computeTile() in module:
https://github.com/senbox-org/s2tbx/blob/master/s2tbx-reflectance-to-radiance/src/main/java/org/esa/s2tbx/reflectance2radiance/ReflectanceToRadianceOp.java

or here:

Method L2A_Tables.TOA_refl2rad() in module:
https://github.com/JanBojko/SEN2COR/blob/master/sen2cor/L2A_Tables.py

Everything is explained in the comments, how to calculate TOA Radiance.
Аctual reference to the algorithm (29.12.2023): https://sentinels.copernicus.eu/web/sentinel/technical-guides/sentinel-2-msi/level-1c/algorithm-overview