Spectra Precision Survey Pro CE v3.6 User Manual - Manual (Page 138)

User’s Manual
132
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
3. Define your horizontal curve by making the
appropriate selections from the first two
buttons and filling in the corresponding
values.
4. Enter the station to be assigned to the PC in
the PC Station field.
5. Check the Interval box if you want to compute
data for stations at fixed intervals on the
curve and enter the distance between them
in the same field.