Surveying
The point where a vertical line through the optical centre of the camera lens intersects the ground, is known as

Ground principal point
Ground plumb point
Perspective centre
Iso-centre

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

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