radiometric offsets L1C

[safalabolo]

A simple question: are the Sentinel-2 L1C bands, before applying super resolution, corrected with "radiometric offsets" (https://scihub.copernicus.eu/news/News00931)?

[jmichel-otb]

No the radiometric offsets are not applied beforehand. Feel free to apply them on super-resolved products.

[jmichel-otb]

A FAQ section has been added in README with this information.

[jmichel-otb]

I realize that I may have mis-interpreted the issue. Upon reading of the L1C product, we apply a -1000 radiometric offset to reflectances if required.

[safalabolo]

@jmichel-otb
I also imagine when talking about the L2A (theia) level, is that correct?

[jmichel-otb]

I think in this case the offset is handled in MAJA (the L1C -> L2A processor).

I updated the FAQ.

[eomasters-repos]

I've also stumbled upon this offset. Compring the read data did not provide the same values as reading the data with other tools.
I think the radiometric offset of -1000 should actually not be applied. This offset is applied by the sensorsio library, I've raised an issue there.
Also, the no-data value is not correctly considered by sensorsio.

[jmichel-otb]

Fixed in https://framagit.org/jmichel-otb/sensorsio/-/merge_requests/14