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

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Surveying
The rise and fall method

quicker and less tedious for large number of intermediate sights
is less accurate than height of instrument method
provides a check on the reduction of intermediate point levels
is not suitable for levelling with tilting levels

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