NA2/NAK2-2.0.0en
Measuring
16
Project:
Height difference (
∆
H) between
point A and B.
Select instrument station
and staff location by
pacing off such that approx. the
same target distances result (d1
≈
d2; approx. 40 to 50m).
Procedure:
1. Setup instrument at I
1
.
Line levelling
2. Setup level staff vertically at
point A.
3. Aim at staff and read off and
take down height (backsight
R).
4. Setup level at the
changepoint 2, aim at staff
and read off and take down
height (foresight V).
5. Setup level at I
2
, aim at staff
at the changepoint 2 and
read backsight and take
down.
6. Carry out a foresight at
changepoint 3.
7. Continue in the same way
until height at point B is
measured.
Result:
∆∆∆∆∆
H = sum backsight - sum
foresight
Example of the booking:
NA-28
A
B
2
3
R
V
R
V
R
V
I
1
I
2
I
3
d
1
d
2
∆
H
Point
No.
Back-
sight R
Fore-
sight V
Height
A
+2.502
650.100
2
+0.911 -1.803
3
+3.103 -1.930
B
-0.981 651.902
Sum +6.516 -4.714
∆
H=
+1.802
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