Spectra Precision Survey Pro v4.5 Ranger Reference Manual - Manual (Page 387)

Curve Menu
R-379
Results
Radius: is the distance from the radius point to the curve.
Delta: is the deflection angle.
Tangent: is the distance from the PC or PT to the PI.
Three Point Curve
Curve 3 Point Curve .
The Three Point Curve screen will compute the details of a curve
when three points of the curve are specified; the PC, PT and any
other point on the curve; or the PC, PT and radius point.
First point: is the first point from the current
job that defines the curve. The specified point
can be either the PC or the Radius Point by
selecting the appropriate radio button.
Note: The selection made for the first point
determines the available choices in the
remaining fields.
Pt. on Curve: is any point that lies on the
curve between the PC and PT.
PC: is the point that defines the beginning of the curve (Point of
Curvature).
PT: is the point that defines the end of the curve (Point of Tangency).
; Store RP : When checked, the radius point will be computed and
stored with the name specified here.