VerticalPositionValue

The relative vertical position of a feature.

Code	Description
onGroundSurface	The feature is on ground level.
suspendedOrElevated	The feature is suspended or elevated.
Underground	The feature is underground.

Where the VerticalPosition has not been determined, this attribute is empty, with a nilReason explicitly stated as ‘unknown’. A correct value does exist, but the methods employed by Ordnance Survey to date have not facilitated capture.