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

foresight
backsight
All of these
intermediate sight

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Surveying
For mapping any country

All listed here
Secondary triangles are further broken into third and fourth order triangles, the points of which are used for detail surveys
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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