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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Surveying
For a line AB

none is correct
the forebearing of AB and back bearing of AB differ by 180°
the forebearing of AB and back bearing of BA differ by 180°
both (A) and (B) are correct

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Surveying
For mapping any country

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

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