Spectra Precision Survey Pro v4.9 - Manual (Page 206)

Store PT: When checked, will store the computed PT point with the specified point name.
[Store RP]: When checked, the computed radius point will be stored with the name specified here.
[Solve]: will compute and store the PT, and if desired, the radius point.
Results
Radius: is the distance from the radius point to the curve.
Length: is the arc length.
Chord: is the chord length.
Delta: is the deflection angle.
Tangent: is the distance from the PC or PT to the PI.
Mid Ord.: is the distance between the curve and the chord at the center of the curve's length.
External: is the minimum distance between the PI and the curve.
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.
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.
Parabolic Curve
[Curve] [Parabolic Curve]
The Parabolic Curve screen provides detailed information on a vertical parabolic curve when certain parts of the curve
are known.
Known: The PVC or PVI radio button is selected to define which point on the curve is known.
One of the following options must be selected from the dropdown list:
Curve Length: is selected when the length of the curve is known. When selected the following must also be
specified:
Point On Curve: is selected when the location of another point on the curve is known. When selected, the
following must also be specified.
Hi/Lo Elevation: is selected when the high or low point for the curve is known. When selected, the following
must also be specified.
Note: When the begin and end grades are both positive or both negative, the high / low elevation will not be located
between the PVC and PVT.
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