Question

In a photographic survey following data is obtained:
Scale of photograph 1 cm = 100 m
Size of photograph = $24\text{cm}\times 24\text{cm}$
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
• B. 118
• C. 126
• D. 119

Answer 1

The correct option is D 119

Ground length covered $=100\times 24(1-0.65)=840m$

Ground width covered =$100\times 24(1-0.35)=1560m$

Net ground area covered by one photograph $=840m\times 1560m$

$=1.3104{\text{km}}^2$

Hence number of photograph $=\frac{155k{m}^2}{1.3104k{m}^2}=118.28\simeq 119$