Surveying
The point on the photograph where bisector between the vertical line through optical centre of the camera lens and the plate perpendicular meets, is known as

Principal point
Perspective centre
Plumb point
Isocenter

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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 distance from two points on traverse line
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

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