L2A DN values to BOA reflectances

Optical Toolbox sen2cor
1

Hi all,
I have obtained L2A products of a tile with sen2corr. Now, I would like to convert DN values to BOA reflectances values, however I am not quite sure about the quantification value that I should use. In the xml file this value is set to 10000 and in some post of this forum someone recommend to use 2000. Please, could anybody clarify this issue?
Thanks in advance.

Gonçal.

2

Dear ,

You can find the quantification value in the xml metadata file.
It looks like that
<QUANTIFICATION_VALUE unit=“none”>10000</QUANTIFICATION_VALUE>

Best.

3

Thank you very much!

4

does anyone know how to reference this conversion from the L2A output to the reflectances values??? I searched for ages, but were just able to find references for the L1C product conversion…

Thanks in advance!

Michi

5

If you mentioned to atmosphere correction, you may find some help in this doc https://earth.esa.int/c/document_library/get_file?folderId=349490&name=DLFE-4518.pdf

6

thanks for your reply!

but i mean something like the “Sentinel-2 – Level-2A Product Definition Document” where i hope topics like this conversion or the datatype (ranges) of the other quality-bands are explicitly explained. Does anyone have a clue where to get this?

1 Like