Question

The average ground is at this region in Pretoria is 1320m and the digital camera used to capture this aerial photograph was on board on aircrafts flying at 1820m above sea level. The focal length of the camera lens used is 80mm.
2.1) calculate the scale of the aerial photography ?

Answer 1

Photographic scale is the ratio of a distance measured on a camera over the respective distance on land:

$$PS=\frac{\text{flying height}}{\text{focal length}}=\frac{(1820-1320)\text{ m}}{0.008\text{ m}}=6250.$$