HeightStyle

[in, out] HeightStyleCode – An enum determining how the way point heights are interpreted.
The HeightStyleCode enum can use any of the following values:

• HSC_TERRAIN_RELATIVE = 0
  All the waypoints are measured relative to the terrain.

• HSC_TERRAIN_ABSOLUTE = 3
  All the waypoints are measured relative to the terrain database vertical datum base ellipsoid.

• Note that for objects with MotionStyle property set to MOTION_GROUND_VEHICLE the HeightStyle property is always set to HSC_TERRAIN_RELATIVE.