Surveying
The displacement of the pictured position of a point of h elevation on a vertical photograph taken with a camera of 30 cm focal length, from an altitude of 3000 m, is

4.4 mm
5.5 mm
7.5 mm
6.5 mm

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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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