Surveying
The flying height of the camera is 1,000 m above mean ground level, the distance of the top of a building from a nadir point is 10 cm and the relief displacement of building is 7.2 mm. The height of the building, is

52 m
82 m
72 m
62 m

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Surveying
Contour interval is

Inversely proportional to the scale of the map
Larger if the time available is more
Directly proportional to the flatness of ground
Larger for accurate works

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