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Question

# An area of size 280 km× 350 km is to be surveyed by photogrammetry. The number of photographs required to cover the area are: Given: Format of photograph = 200 mm×220 mm Scale of photograph = 1 : 25000 Average terrain elevation = 380m Longitudinal overlap = 60% Side overlap = 40% Focal length of camera = 210 mm13846

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Solution

## The correct option is A 13846 Net length of single photograph = (1−0.6)×220=88mm Net length of single photograph on earth = 88×S=88×25000=2200000mm=2.2km Number of photographs in one line. N1=3502.2+1∼––161 Net width of single photograph = (1−0.4)×220=132 mm Net width of single photograph on earth = 132×S=132×25000=3300×103mm = 3.3km Number of flight lines N2=2803.3+1≃86 Total number of photographs = N1×N2=161×86=13846 Nos

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