In this blink animation the Patterson subject is standing in the steps of Jim McClarin who was filmed eight months later. The height of Mr.McClarin is known and is 6’5″ in his boots which he is in. The film subject’s apparent height is determined by spatial alignment between the film Mr.McClarin is in and the Patterson film. When everything is aligned then the Patterson subject is at the correct apparent height. This is the most accurate method as the two are standing in each other’s steps and broken ground does not need to be accounted for.
The Davis Report 
The head’s definitely taller, and Patty’s feet are perhaps more deeply embedded in the sand. The bulk, though, is obviously the most striking difference.