Surveying
The allowable length of an offset depends upon the

degree of accuracy required
All of these
scale of plotting
method of setting out the perpendiculars and nature of ground

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

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