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

Perspective centre
Ground plumb point
Ground principal point
Iso-centre

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Surveying
Pick up the correct statement for horizontal photographs.

All listed here
The lines parallel to the negative plane are projected as parallel lines
The two sides of a road meet at the vanishing point
Parallel lines do not appear parallel in central projection

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Surveying
For mapping any country

Primary triangles are broken down into secondary triangles of somewhat lesser accuracy
Geodetic triangulation of greatest possible sides and accuracy is carried out
Secondary triangles are further broken into third and fourth order triangles, the points of which are used for detail surveys
All listed here

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