Spectra Precision Survey Pro v4.9 - Manual (Page 200)

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.
External: (not shown) The minimum distance between the PI and the curve.
Segment: is the area between the arc length and the chord.
Sector: is the area between the arc length and the two edge radii.
Fillet: is the area between the arc length and the tangents.
Known PI and Tangents
[Curve] [PI and Tangents]
The PI and Tangents screen is used to compute and store the PC, PT, a nd radius points when the PI point and the
direction of both tangents are known, along with one other curve attribute.
PI Point: is the PI point.
[Azm PI->PC] / [Brg PI->PC]: is the direction of the tangent from the PI to the PC.
[Azm PI->PT] / [Brg PI->PT]: is the direction of the tangent from the PI to the PT.
The remaining curve attribute can be defined with one of the following selections:
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 PC: When checked, will store the computed PC point with the specified point name.
Store RP: When checked, will store the computed radius point with the specified point name.
Store PT: When checked, will store the computed PT point with the specified point name.
Results
Radius: is the distance from the radius point to the curve.
Delta: is the deflection angle.
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