Surveying
The line of collimation method of reduction of levels, does not provide a check on

Intermediate sights
Fore sights
Back sights
Reduced levels

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Surveying
For mapping any country

Geodetic triangulation of greatest possible sides and accuracy is carried out
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

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