You have been engaged to capture 1:5000 aerial photography of Pearson Internatio

Question

You have been engaged to capture 1:5000 aerial photography of Pearson International Airport. For the purposes of this exercise, assume that the airport has a rectangular dimensions of: east-west - 4km and north-south - 5km and an average terrian elevation of 172m. The available aerial camera has a focal length of 152mm and a film format of 230mm by 230mm. Assume that you need stero coverage (i.e., 60% forward overlap and 30% sidelap)

a) What would be the ground footprint of a single image?

b) What flying height would be used?

c) How many photographs would you be required to take?

d) If the aircraft ground speed is 180km/h, what is the exposure interval (i.e., time between each exposure/photograph in a strip)?

Explanation / Answer

a)Ground footprint of a single image would be so large as 60% forward overlap is needed.

b)Flying height should be greater than 172 m (greater than the terrain elevation ).

c)Nearly 2 photographs must be taken.(230/172)

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