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levelling
basically two types of levelling..
1.Direct Levelling
2.Indirect Levelling.
further they can be classified as well.
there are commonly five tpes of levelling:-
1.simple levelling
2.differential
3.reciprocal levelling
4.profile levelling
5.cross section levelling
Levelling the Land was created in 1991-09.
thue advantages and dis advantages of levelling