This XMP value represents EXIF GPS tag 5 (0x5) and indicates whether the altitude is above or below sea level.
public com.accusoft.imagegear.formats.xmp.ImGearXMPEnum<ImGearEXIFGPSAltitudeReference> getGPSAltitudeRef()
ImGearEXIFXMPMetadata Class ImGearEXIFXMPMetadata Members
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