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. 118
• B. 119
• C. 125
• D. 126

Answer 1

The correct option is B 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 $=\frac{155k{m}^2}{1.3104k{m}^2}=118.28\simeq 119$