Why to use GimbalYawDegree instead of FlightYawDegree in opposite to what ODM do?

[khaled-hammoud]

While I am looking the file photo.py from ODM, exactly here:
https://github.com/OpenDroneMap/ODM/blob/12e5b63b6f5423383892d325467b64ce295e3a9c/opendm/photo.py#L463

I see using of gimbal's roll and pitch BUT flight's yaw instead of gimbal's yaw.

On the other side when looking into file exif.py from opensfm, exactly here:

OpenSfM/opensfm/exif.py

Line 494 in 537275b

"@drone-dji:GimbalYawDegree" in self.xmp[0]

then I see what I expect or claim to be, is there any explanation for that?

My regards.