Surveying
An imaginary line lying throughout the surface of ground and preserving a constant inclination to the horizontal is known as

contour line
contour interval
contour gradient
horizontal equivalent

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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
All listed here
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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Surveying
The rise and fall method

quicker and less tedious for large number of intermediate sights
is not suitable for levelling with tilting levels
provides a check on the reduction of intermediate point levels
is less accurate than height of instrument method

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