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Compute the elevations of points A and B in Problem 27.20.
Problem 27.20:
Similar to Problem 27.19, except the air base is 6940 ft, the flying height above mean sea level is 12,520 ft, the x and y photo coordinates on the left photo are xa = 37.98 mm, ya = 50.45 mm, xb = 24.60 mm, and yb = -46.89 mm, and the x photo coordinates on the right photo are xa = -52.17 mm and xb = -63.88 mm.
Problem 27.19:
An air base of 3205 ft exists for a pair of overlapping vertical photographs taken at a flying height of 5500 ft above MSL with a camera having a focal length of 152.4 mm. Photo coordinates of points A and B on the left photograph are xa = 40.50 mm, ya = 42.80 mm, xb = 23.59 mm, and yb = -59.15 mm. The x photo coordinates on the right photograph are xa = -60.68 mm and xb = -70.29 mm. Using the parallax equations, calculate horizontal length AB.
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[Hint: This problem can be solved using the formalism developed in Section 6.3. This problem has been solved in the scientific literature, and the solution is given by Abrams and Lind, 1978.]
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