Spectra Precision Survey Pro v3.80 Recon iPAQ User Manual - Manual (Page 164)

User’s Manual
156
Tangent Offset
The Tangent Offset method computes a
perpendicular offset length (Tangent Offset)
from the PC-PI line to the current station
and the distance on the PC-PI line from the
PC to the Tangent Offset (Tangent
Distance).
RP
PT
PI
PC
Tan Of
fset
Current
Station
Tan Dist.
Tangent
Tan - TD
Chord Offset
The Chord Offset method computes a
perpendicular offset length from the PC-PT
line to the current station (Chord Offset), the
distance on the PC-PT line from the PC to
the chord offset (Chord Distance), the
distance from the PC to the current station
(Chord Length) and the deflection angle from
the PC-PT line to the PC-Station line.
RP
PT
PI
PC
Current
Station
Chord
Offset
Chord Dist.
Chord Length
PC Deflection