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Wed Apr 17 13:17:15 BST 2019

"Exif.GPSInfo.GPSAltitude: Indicates the altitude based on the
reference in GPSAltitudeRef. Altitude is expressed as one RATIONAL
value. The reference unit is meters."

Since the value is stored as an _unsigned_ rational, it can't hold a
negative value.

"Exif.GPSInfo.GPSAltitudeRef: Indicates the altitude used as the
reference altitude. If the reference is sea level and the altitude is
above sea level, 0 is given. If the altitude is below sea level, a
value of 1 is given and the altitude is indicated as an absolute value
in the GSPAltitude tag. The reference unit is meters. Note that this
tag is BYTE type, unlike other reference tags."


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