Surveying
The rise and fall method of levelling provides a complete check on

All of these
intermediate sight
foresight
backsight

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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
All listed here
Primary triangles are broken down into secondary triangles of somewhat lesser accuracy

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