Surveying
Refraction correction

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

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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
All listed here
Geodetic triangulation of greatest possible sides and accuracy is carried out
Primary triangles are broken down into secondary triangles of somewhat lesser accuracy

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