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Question

# In a photographic survey following data is obtained: Scale of photograph 1 cm = 100 m Size of photograph = 24 cm×24 cm Area to be covered = 155 square km Longitudinal overlap = 65% Side overlap = 35% The total number of photographs required for covering the above area is

A
125
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B
118
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C
126
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D
119
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Solution

## The correct option is D 119Ground length covered =100×24(1−0.65)=840m Ground width covered =100×24(1−0.35)=1560m Net ground area covered by one photograph =840m×1560 m =1.3104km2 Hence number of photograph =155 km21.3104 km2=118.28≃119

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