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

f/H
f/H cos ½θ
f/H sec θ
f sec θ/H

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Surveying
In triangulation surveys

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

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