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
y-parallax is not affected
All listed here
The scale of the model is altered

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Surveying
In triangulation surveys

The area is divided into triangular figures
Sides are not measured excepting the base line
Control stations are located from which detailed surveys are carried out
All listed here

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