Double Bearing - Leica GPS1200 Series Technical Reference Manual

Survey - Hidden Points
46.3.2
Description
Diagram

Double Bearing

Two points must be known. They
• may already exist in the job.
• may be manually occupied during the hidden point measurements.
• may be manually typed in.
The bearings from the known points to the hidden point are to be determined. Auxiliary points
help compute the bearings which might not be known. Auxiliary points may be measured in
the direction from the known points to the hidden point.
P3
P4
P0
GPS12_42
GPS1200
Known
P2
P0 First known point, <Point A:>
P3 Second known point, <Point B:>
To be measured
α
α
P1
P1 First auxiliary point, optional
P4 Second auxiliary point, optional
Unknown
P2 Hidden point
1 Bearing from P0 to P2
2 Bearing from P3 to P2
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