imageTiltReference

Sets the type tilt to apply when Placemark.imageTilt is non-zero. This value indicates whether to apply this placemark's image tilt relative to the screen or the globe.
If OrientationMode.RELATIVE_TO_SCREEN, this placemark's image is tilted inwards (for positive tilts) relative to the plane of the screen, and its orientation relative to the globe changes as the view changes. If OrientationMode.RELATIVE_TO_GLOBE, this placemark's image is tilted towards the globe's surface, and retains its orientation relative to the surface.