Sure you could but you still have to accurately know the distance of the photograph and the exact height to work it out with trigonometry.
The study of trig is just a basic part of geometry ,which by the way is the only exact science known to man kind .However you must have things exactly...
As long as you can see the horizon --sextant--clinenometer--samo -samo .Angle of the dangle type thing .
No matter what method it is nomally you will hit within 10 percent,all things done correctly .Even a laser range finder can get a false echo .
In my opinion a transit is the most accurate...
Lots of methods of surveying heights of things.Laser range finder , clinometer ,mirror over the shoulder at 45 degrees ,transit .Pick your poison,they all work--to a degree .
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