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

6.5 mm
4.4 mm
5.5 mm
7.5 mm

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Surveying
Which of the following methods of theodolite traversing is suitable for locating the details which are far away from transit stations?

Measuring angle and distance from one transit station
Measuring angles to the point from at least two stations
Measuring angle at one station and distance from other
Measuring distance from two points on traverse line

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Surveying
Refraction correction

completely eliminates curvature correction
has no effect on curvature correction
adds to the curvature correction
partially eliminates curvature correction

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