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Why do you think he was basing on his observations? His films are so planned, he has a team, and finally he can go down with camera turned off, measure it, go up, and make a shot –  Łukasz 웃 L ツ Aug 30 '13 at 5:49
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I understand that he took some short cuts during filming, but that's besides the point. I am more interested if there is any objective way to get some numbers. Can you elaborate on your first and second point? It is hard to visualize without a diagram. Point 3 can be quite subjective. Point 4, is a good point. I would probably tie a rock to a rope or some vines and lower it down to get the wetted length instead of throwing it down where I want to jump. Sorry, looks like I am asking too much :[ –  Question Overflow Aug 26 '13 at 10:19
To estimate distances/heights/depths, parallax is very useful. It requires you to move sideways and estimate the difference in what you can see from each point. Basically you use a bit of pythagoras theory to get a close approximation. 3 subjective - yes, but pretty useful in those conditions. –  Rory Alsop Aug 26 '13 at 10:23
Don't know how many times I've thrown a rock into a pool of unknown depth, watched it disappear and said, "Well it is deeper than that rock..." ;) –  LBell Aug 30 '13 at 1:58
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