Surveying
For mapping any country

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

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Surveying
Theodolite is an instrument used for

measurement of vertical angles only
measurement of horizontal angles only
tightening the capstan-headed nuts of level tube
measurement of both horizontal and vertical angles

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