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

Perspective centre
Isocenter
Plumb line
Principal point

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Surveying
The meridian of a place is

A great circle whose plane is perpendicular to the axis of rotation and it also passes through the place
A great circle passing through the place and the poles
An arc of the great circle which passes through the place and is perpendicular to the equator
A semi-circle which passes through the place and is terminated at the poles

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