Leica GPS1200+, Technical Reference Manual, Page: 1258 / 1442

Survey - Hidden Points 1258
47.3.2 Double Bearing
Description 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.
Diagram
Known
P0 First known point, <Point A:>
P3 Second known point, <Point B:>
To be measured
α 1 Bearing from P0 to P2
α 2 Bearing from P3 to P2
P1 First auxiliary point, optional
P4 Second auxiliary point, optional
Unknown
P2 Hidden point
GPS12_42
P0
P1
P4
P3
P2