Differentiate between simple levelling and differential levelling with neat sketch.

Differentiate between simple levelling and differential levelling with neat sketch. 
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1 Answer

Answer :

S.N
Simple Levelling
Differential levelling
1 Instrument is not shifted till the end of survey work. 
Instrument is shifted as per requirements.
2 In this difference in elevation between two point is determined, when two points are visible from instrument, small distance apart.
In this difference in elevation between two point is determined, when two points are too far & staff reading is not possible.
3 Difference in elevation between two points is small & no obstacle between them.
Difference in elevation between two points is more or any obstacle between them.
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