Surveying
The maximum error in radial line assumption, is

h/H f tan θ
h/H f² tan θ
h/H f cos θ
h/H f² sin θ

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Surveying
For mapping any country

Secondary triangles are further broken into third and fourth order triangles, the points of which are used for detail surveys
Primary triangles are broken down into secondary triangles of somewhat lesser accuracy
All listed here
Geodetic triangulation of greatest possible sides and accuracy is carried out

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