Hello,
I want to reference a discussion I had with Florian from the OPT-MPC at the CDSE Forum. In the linked thread he says:
- Reflectance of S2 products can be negative down to -0.1
Currently values of -0.1 are marked as no-data but they are valid.
This means that SNAP needs to update the no-data handling and use a combination of the detector footprint and the no-data mask.