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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 mm
  1. 13846

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Solution

The correct option is A 13846

Net length of single photograph = (10.6)×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+1161

Net width of single photograph =

(10.4)×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+186

Total number of photographs =
N1×N2=161×86=13846 Nos

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