Surveying
The distance between the minor control point and the principal point should be equal to

Sum of the base lines of stereo pair
Base line of the left photograph of stereo pair
Mean of the base lines of the stereo pair
Base line of the right photograph of stereo pair

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Surveying
In triangulation surveys

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

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