Surveying
Pick up the correct statement for horizontal photographs.

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

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Surveying
Refraction correction

has no effect on curvature correction
adds to the curvature correction
completely eliminates curvature correction
partially eliminates curvature correction

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