Surveying
Refraction correction

partially eliminates curvature correction
completely eliminates curvature correction
adds to the curvature correction
has no effect on curvature correction

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Surveying
In triangulation surveys

Control stations are located from which detailed surveys are carried out
Sides are not measured excepting the base line
The area is divided into triangular figures
All listed here

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Surveying
The rise and fall method

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

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