A tower appears in two successive photographs taken at an altitude of 4000m above the datum. The focal length of the camera is 160mm. The parallax for the top and bottom of the pole is 72mm and 63mm respectively. If the height of the tower is 25m, then calculate the length of the air base. (a) 63.25 m (b ) 78.75 m (c) 112.25 m (d) 225 m

Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
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A tower appears in two successive photographs taken
at an altitude of 4000m above the datum. The focal
length of the camera is 160mm. The parallax for the
top and bottom of the pole is 72mm and 63mm
respectively. If the height of the tower is 25m, then
calculate the length of the air base. (a) 63.25 m (b
) 78.75 m (c) 112.25 m (d) 225 m
Transcribed Image Text:A tower appears in two successive photographs taken at an altitude of 4000m above the datum. The focal length of the camera is 160mm. The parallax for the top and bottom of the pole is 72mm and 63mm respectively. If the height of the tower is 25m, then calculate the length of the air base. (a) 63.25 m (b ) 78.75 m (c) 112.25 m (d) 225 m
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