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Chainage & offset
Backwards bearing &
distance
Apps - The Toolbox
The distances from the known points to the hidden points are to be deter-
mined. The location of the hidden point relative to the line between the two
known points is to be defined.
Diagram
P2
d2
b
a
d3
d1
P0
GS_065
Description
Two points must be known. They
can exist in the job.
•
can be manually measured during the hidden point measurements.
•
can be manually typed in.
•
The chainage from one known point along the line between the two known
points must be determined. The offset of the hidden point to the line between
the two known points must be determined.
Diagram
P1
d2
d1
P0
GS_067
Description
In order to compute the hidden point, the measurements are taken from the
hidden point.
One point must be known. It
Known
P0 First known point
P2 Second known point
d3 Line from P0 to P2
a
Right of d3
P1
b
Left of d3
To be measured
d1 Distance from P0 to P1
d2 Distance from P2 to P1
Unknown
P1 Hidden point
Known
P0 First known point
P1 Second known point
P2
To be measured
d1 Chainage
d2 Offset
Unknown
P2 Hidden point
439
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