Surveying
The scale of a tilted photograph of focal length f taken from an altitude H, along the plate parallel through principal point is

f/H
f/H sec θ
f/H cos ½θ
f sec θ/H

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Surveying
The necessary geometrical condition for triangulation adjustment is:

The sum of the angles around a station should be 360°
All listed here
The sum of the eight angles of a braced quadrilateral should be 360°
The sum of the three angles of a plane triangle should be 180°

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