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
Geodetic triangulation of greatest possible sides and accuracy is carried out
All listed here

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Surveying
The cross hairs in the surveying telescope are placed

much closer to the objective lens than to the eye piece
anywhere between eye-piece and objective lens
much closer to the eye-piece than to the objective lens
midway between eye piece and objec-tive lens

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