Surveying
The rise and fall method of levelling provides a complete check on

intermediate sight
All of these
backsight
foresight

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Surveying
For mapping any country

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

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Surveying
Contour interval is

Larger if the time available is more
Larger for accurate works
Inversely proportional to the scale of the map
Directly proportional to the flatness of ground

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