One of the following:
sgHeightRelative – the height parameter represents the distance of the coordinate above the ground.
sgHeightOnTerrain – the height parameter is ignored and the coordinate is on the terrain.
sgHeightAbsolute – the height parameter represents the absolute height (relative to sea level).
Remarks
If positioning an object (e.g., a polygon) in the 3D world and desiring to set its height to be 300 meters above the terrain, the height property must be set to 300 and the heightType property to sgHeightRelative. If choosing the height of the object to be relative to the sea level, the heightType property must be set to sgHeightAbsolute. In some cases where two dimensional objects are involved (e.g., polygons, rectangles etc.), the object can be drawn directly on the terrain surface. To do this, the heightType must be set to sgHeightOnTerrain. If this property is set to sgHeightOnTerrain, and the object cannot be drawn on the terrain surface (e.g., cylinder), the height property of the object will be interpreted as if sgHeightRelative was selected.