An aerial survey is conducted with a flying height (H) of 2000 m above msl. The baseline distance (B) between two photographs is measured as 20 m. If the focal length of the camera (f) is 50 mm, and the X-parallax (P) is measured as 0.1 cm, the object height (h) between the two points will be: 1000 m 500 m 400 m 200 m
Question
An aerial survey is conducted with a flying height (H) of 2000 m above msl. The baseline distance (B) between two photographs is measured as 20 m. If the focal length of the camera (f) is 50 mm, and the X-parallax (P) is measured as 0.1 cm, the object height (h) between the two points will be: 1000 m 500 m 400 m 200 m
Solution
To solve this problem, we can use the formula for calculating the height difference between two points in aerial photography, which is:
h = H * (P * B) / f
Where: h = height difference between two points H = flying height above mean sea level (msl) P = parallax difference B = baseline distance f = focal length of the camera
Given: H = 2000 m P = 0.1 cm = 0.001 m (since 1 cm = 0.01 m) B = 20 m f = 50 mm = 0.05 m (since 1 mm = 0.001 m)
Substituting these values into the formula, we get:
h = 2000 * (0.001 * 20) / 0.05 h = 2000 * 0.02 / 0.05 h = 40 / 0.05 h = 800 m
However, none of the options provided (1000 m, 500 m, 400 m, 200 m) match this result. There might be a mistake in the problem or the provided options.
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