I have a DJI drone image. When I use
gdalinfo -mdd all myphoto.jpg at the command line I can read the EXIF and XMP tags for the image. I see there are two values for focal length.
and an XMP tag that reads
What is this calibrated focal length and how does it affect the EXIF focal length value? Should the calibration be added or subtracted from 8.8mm value to get the true focal length? If so, what is the unit of measure of the calibrated focal length value?