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

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Surveying
For mapping any country

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

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