Line Levelling - Leica NA2 User Manual

Line levelling

A
Project:
Height difference (∆H) between
point A and B.
pacing off such that approx. the
same target distances result (d1
≈ d2; approx. 40 to 50m).
Procedure:
1. Setup instrument at I
NA2/NAK2-2.0.0en
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R V
d d
R V
1 I 2
1
2 I
2
2. Setup level staff vertically at
point A.
3. Aim at staff and read off and
take down height (backsight
R).
Select instrument station
4. Setup level at the
and staff location by
changepoint 2, aim at staff
and read off and take down
height (foresight V).
5. Setup level at I
at the changepoint 2 and
read backsight and take
.
1
down.
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6. Carry out a foresight at
changepoint 3.
7. Continue in the same way
until height at point B is
R V
measured.
I
3
B
∆ ∆ ∆ ∆ ∆ H = sum backsight - sum
∆H
3
Example of the booking:
Point
No.
A
2
3
, aim at staff
B
2
Sum +6.516 -4.714
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Result:
foresight
Back- Fore-
Height
sight R sight V
+2.502 650.100
+0.911 -1.803
+3.103 -1.930
-0.981 651.902
∆H=
+1.802
Measuring
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