A vertical photograph was taken from a height of 3200 m above mean sea level with a camera of focal length 120 mm. It contained two points 'a' and 'b' corresponding to ground points A and B. Calculate the horizontal length AB, as well as the average scale along the line 'ab' from the following data: Photo points a b Elevation above MSL in (m) 640 780 Photo coordinates x(mm) y(mm) + 19.50 - 14.60 + 26.70 + 10.80 -

Structural Analysis
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Chapter2: Loads On Structures
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A vertical photograph was taken from a height of 3200 m above mean sea level with a camera of
focal length 120 mm. It contained two points 'a' and 'b' corresponding to ground points A and B.
Calculate the horizontal length AB, as well as the average scale along the line 'ab' from the following
data:
Photo points
a
b
Elevation above
MSL in (m)
640
780
Photo coordinates
x(mm) y(mm)
+ 19.50
- 14.60
+ 26.70
+ 10.80
Transcribed Image Text:A vertical photograph was taken from a height of 3200 m above mean sea level with a camera of focal length 120 mm. It contained two points 'a' and 'b' corresponding to ground points A and B. Calculate the horizontal length AB, as well as the average scale along the line 'ab' from the following data: Photo points a b Elevation above MSL in (m) 640 780 Photo coordinates x(mm) y(mm) + 19.50 - 14.60 + 26.70 + 10.80
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