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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Surveying
Bowditch rule is applied to

an open traverse for graphical adjustment
a closed traverse for adjustment of closing error
determine the effect of local attraction
None of these

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