Cgkdisc
.:Hall of Fame Member:.
This might clarify it further. Consider JC's diagram in post #15 where the green area is actually a deck (versus a tree) partly over the water. In this case, landing on the deck would likely be defined as inbounds because it's a playing surface where you can mark your lie and take a stance. However, since the tree is not considered a playing surface where you are allowed to mark and take a stance, where your disc touches or lands in the tree does not matter in terms of calling IB or OB. The disc's position must be projected down to the surface to make that determination. If the surface directly below is OB, the disc is OB. If it's inbounds, the lie is inbounds.