How would I convert the rational64u GPSTrack --from an exif-- into a direction?
with:
import piexif
exif_dict = piexif.load('./img/IMG_1146.jpg')
h = exif_dict['GPS'][piexif.GPSIFD.GPSTrack]
h
we get: (116001, 424)
with metapix the result is: GPSTrack 273.5872642. An example image here.
What must I do to (116001, 424) to get a bearing?
It is rational64u (as used in latitudes and longitudes, and in many places in EXIF) so a float is represented by two integers, a numerator and a denominator.
To get the float, you just divide the two:
degree = numerator / denominator
so
degree = numerator / denominator = 116001 / 424 = 273.587264150943
Usual warning: carious computer languages will do an integer division if the two operand are integer, so you may need to cast them to floats before doing the division.