Surveying
Horizontal distances obtained by thermometric observations

do not require slope and tension corrections
require slope correction
require tension correction
require slope and tension corrections

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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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