Spectra Precision Survey Pro CE v3.6 User Manual - Manual (Page 338)

Curve Menu
R-181
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
&XUYH  3RLQW &XUYH 
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.