Area Levelling - Leica NA2 User Manual

Area levelling

Project:
Height difference of several
reference points.
with such measurements.
Nevertheless, from time to time
read the staff on a stable
intermediate point (reading must
remain the same).
NA2/NAK2-2.0.0en
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Procedure:
1. Set up instrument centrally
1
A
S1
between the desired points.
R
S2
The instrument telescope
2
may not be below the highest
S4
S3
measured intermediate point.
2. Set up staff vertically at
4
3
reference point A.
3. Aim at staff and read and
take down height (=backsight
to known point).
4. Set up staff vertically at
point 1.
5. Aim at staff and read and
The required accuracy is
take down height
usually not very high
(=measuring intermediate
point, intermediate sight)
6. Repeat steps 4 and 5 for
additional intermediate
points.
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7. The height of individual points
are:
Height of station point
+ backsight (A)
- intermediate sight
Example of booking:
Point
No.
A 592.00
R1 +2.20
⊗
594.20
S1
S2
S3
S4
⊗ =Instrument horizon
17
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Height =
Interm.
Height
sight
-1.80 592.40
-1.90 592.30
-2.50 591.70
-2.30 591.90
Measuring
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