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

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

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Surveying
The rise and fall method

provides a check on the reduction of intermediate point levels
is not suitable for levelling with tilting levels
quicker and less tedious for large number of intermediate sights
is less accurate than height of instrument method

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