Differential Leveling
Differential Leveling
Backsight (BS) at BM
Foresight
(FS) at X
- Definition of Backsight (BS), and Foresight (FS)
- Elevation of line of sight (HI)= BM elevation + BS at BM
- Elevation of point X = HI - FS at X
- Consider X a new BM, and repeat for another point , etc..