ImageEn, unit iexBitmaps




property EXIF_GPSAltitudeRef: AnsiString;


Returns the altitude used as a reference:
- If the reference is sea level and the altitude is above sea level, "0" is returned.
- If the altitude is below sea level, a value of "1" is returned and the altitude is indicated as an absolute value in the EXIF_GPSAltitude tag.

The reference unit is meters.

Default value is empty string, which means "unknown". An unknown value is not written when saving EXIF values.

Note: To save GPS data, you must set EXIF_GPSVersionID to '' (or use the const, GPS_Version_ID)