Problem: The ground distance is 8527 feet between point A whose elevation above sea level is 580 feet and point B whose elevation is 860 feet. A vertical photograph on which the images a and b of the two ground point appear is taken with a camera with a focal length of 6.008 inches. The photo coordinates of a are measured to be xa = -2.154 inches and ya = 3.320 inches; the photo coordinates of b are measured to be xb = 1.954 inches and yb = -0.104 inches.
Part A: Compute the flying height above sea level?
I need help to find the flying height above sea level.