Question 1: The following measurements were made on four different sets of adjacent left and right photographs:
|
Point
|
x (left photo)
|
x' (right photo)
|
|
a
|
2.36 inches
|
-1.07 inches
|
|
B
|
68.05 mm
|
-21.61 mm
|
|
C
|
3.92 inches
|
0.39 inches
|
|
D
|
10037 mm
|
8.52 mm
|
a) Calculate the x parallax (p) for each point.
b) Can you tell which point has the highest and lowest elevation from this data? Why or Why not?
Question 2: Calculate the elevations of the ground points imaged by a, b, c, d in problem 1 above if the camera focal length is 6 inches, thing height above datum is 8,100 feet, and the air base is 4450 feet.
Question 3: A pair of overlapping vertical photographs were mounted for parallax measurement. The distance D is 10.37 inches. The distance d is measured between the respective image points on the left and right photo as listed below:
|
Point
|
d
|
|
a
|
6.79 inches
|
|
b
|
7.07 inches
|
|
c
|
6.35 inches
|
|
d
|
6.60 inches
|
a) Calculate the x parallax (p) for each point.
b) Can you tell which point has the highest and lowest elevation from the data? Why or why not.
Question 4: Assume that point A in problem 3 above has an elevation of 1190 feet above datum and that the photos were taken with a 3.5 inch focal-length camera. If the air base is 3,690 feet, what are the elevations of points B, C, D?
Question 5: The distance between two ground control points A and B is 3337.8 meters. The elevation of A is 208.9 meters. Parallax measurements in two adjacent photographs containing image points a and b of the ground control points A and B are pa = 72.21 mm and pb = 74.16 mm. The coordinates of a and b in the left photo are xa = 48.28 mm and ya = 50.60 mm; xb = 67.66 mm and yb = -70.15 mm. The focal length of the camera is 100.60 mm. Compute the length of the airbase, the flying height and the elevation of point B.
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