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    exif:gpsAltitudeRef
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    http://www.w3.org/2003/12/exif/ns#gpsAltitudeRef

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    exif:

    lang:en
    GPSAltitudeRef
    lang:en
    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 GPSAltitude tag. The reference unit is meters.