It is known from public records that relative to a surveyor's benchmark nearby, the coordinates of the top of the three spires are, in feet
\(\left( 554, 878, 1167 \right) \)
\(\left( 770, 690, 1005 \right) \)
\(\left( 1510, -630, 775 \right) \)
The shot was made horizontal, so that vertical lines in the landscape appear as vertical lines in the photograph. But the shot was made \(z\) feet above the ground. That is, at the time of the shot, the camera was at, in feet, relative to the same benchmark
\(\left( x,y,z \right) \)
Find \(z\), in feet
Note: Disregard the curvature of the Earth. Also, assume ideal pinhole optics and flat film plate. Not a "swept panorama shot". Also, solution is unique.