# photogrammetry

Type A: If it takes 650 vertical photographs at a scale of 1:22,000 to completely cover a square-shaped study area, how many photographs would be required to cover the same area at a scale of 1:65,000?

Type B: A mapping camera has a focal length of 152mm. To obtain vertical airphotos at a scale of 1:40,000, the camera would have to be flown at an altitude of how many meters?

Type C: Suppose you wish to fly a photographic mission with a 350mm focal-length lens over a study area with an average elevation of 1,500m. If the airplane has a maximum operating ceiling of 13,700m above sea level, could vertical airphotos be obtained at a scale of 1:40,000?

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#### Solution Preview

Type A: If it takes 650 vertical photographs at a scale of 1:22,000 to completely cover a square-shaped study area, how many photographs would be required to cover the same area at a scale of 1:65,000?

Number of photographs n1 = 650

scale 1 = 1:22,000 => s1 = 22000

scale 2= 1:65,000, s2 = 65000

Number of photographs, n2 = ?

case1:

1 photograph == ...

#### Solution Summary

In this solution, 3 numerical problems related to air-photography are solved.