Area Levelling - Leica RUNNER 20 User Manual

Area levelling

A
S1
R
S4
4
Wanted:
Height difference of several
reference points.
The required accuracy is
usually not very high
with such measurements.
Nevertheless, from time to time
read the staff on a stable
intermediate point (reading must
remain the same).
RUNNER 20/24-1.0.1en
Procedure:
1. Set up instrument centrally
1
between the desired points.
The instrument telescope may
S2
not be below the highest
2
measured intermediate point.
S3
2. Set up staff vertically at
reference point A.
3
3. Aim on staff and read and
take down height (=backsight
to known point).
4. Set up staff vertically at
point 1.
5. Aim on staff and read and
take down height (=measuring
intermediate point,
intermediate sight)
6. Repeat steps 4 and 5 for
additional intermediate points.
7. The height of individual points
are:
17
Height =
Height of station point
+ backsight (A)
- intermediate sight
Example for booking:
Point Interm.
No. sight
A 592.00
R1 +2.20
⊗
594.20
S1 -1.80
S2 -1.90
S3 -2.50
S4 -2.30
⊗ =Instrument horizon
Height
592.40
592.30
591.70
591.90
Measuring