Surveying
For mapping any country

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

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Surveying
Refraction correction

has no effect on curvature correction
adds to the curvature correction
partially eliminates curvature correction
completely eliminates curvature correction

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