Surveying
If the distance between the projectors is altered by a movement along X-axis of one projector,

The length of the air base is increased
All listed here
y-parallax is not affected
The scale of the model is altered

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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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