Surveying
The foot of the perpendicular on the picture plane through the optical centre of the camera lens, is known as

Perspective centre
Principal point
Isocenter
Plumb line

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Surveying
The necessary geometrical condition for triangulation adjustment is:

The sum of the angles around a station should be 360°
The sum of the eight angles of a braced quadrilateral should be 360°
The sum of the three angles of a plane triangle should be 180°
All listed here

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