Add black level support for certain DJI drones #1772
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Adds support for reading the
BlackCurrent(black level) tag in DJI drones (e.g. M3M).I also noticed that in absence of a radiometric calibration coefficient (from Micasense), the multiplication skews the reflectance values. I can't quite remember why we had such a fallback multiplication, but I can't find any reference in the updated Micasense codebase, so I think it's correct and safe to remove.
Might solve https://community.opendronemap.org/t/need-help-with-dji-m3m-ortophoto-generation/20893 (issue 2).