Reference no: EM132413787
SUR 340 Photogrammetry and Remote Sensing Assignment - Parallax, Great Basin College, USA
Q1. 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?
Q2. 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.
Q3. 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.
c) Can you tell which point has the highest and lowest elevation from the data? Why or why not.
Q4. 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?
Q5. 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.