Surveying
‘H’ is the flying height above mean ground level and ‘f’ is the principal distance of a vertical photograph. The mean scale of the photographs is

f/H
H/f
H + f
H. f

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Surveying
For mapping any country

All listed here
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
Geodetic triangulation of greatest possible sides and accuracy is carried out

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