Spectra Precision Survey Pro v4.9 - Manual (Page 202)

Fillet: is the area between the arc length and the tangents.
Compute Radius Point
[Curve] [Radius Point]
The Compute Radius Point screen is used to compute and optionally store the radius point for a curve when certain
parts of the curve are known.
PC Point: is the point that defines the beginning of the curve (Point of Curvature).
PT Point: is the point that defines the end of the curve (Point of Tangency).
Turn: specifies if the curve turns to the Left or Right as you face the curve from the PC.
Arc: specifies if the arc is Small (less than 180°) or Large (greater than 180°).
The final part of the curve is defined by one of the following choices:
Radius: is the distance from the radius point to the curve.
Delta: is the deflection angle.
Degree Arc: is the deflection angle that results in a 100-ft. arc length.
Degree Chord: is the deflection angle that results in a 100-ft. chord length.
Store RP: When checked, the computed radius point will be stored with the name specified here.
[Solve]: computes the location of the radius point.
[Layout…]: opens the Curve Layout screen.
[Traverse…]: opens the Traverse on Curve screen.
Results
Radius: is the distance from the radius point to the curve.
Length: is the arc length.
Chord: is the chord length.
Deg. Arc: is the deflection angle that results in a 100-ft. arc length.
Deg. Chord: is the deflection angle that results in a 100-ft. chord length.
Delta: is the deflection angle.
Tangent: is the distance from the PC or PT to the PI.
External: is the minimum distance between the PI and the curve.
Mid Ord.: is the distance between the curve and the chord at the center of the curve's length.
Segment: is the area between the arc length and the chord.
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