Spectra Precision Survey Pro v4.9 - Manual (Page 204)

Deflection: is the angle to turn to the current station.
PI to Station: is the distance from the PI to the current station.
Tangent Offset: provides perpendicular offset information from the tangent (the line from the PC to the PI) for each
station on the curve. The results are given in the following format:
Station: is the current station on the curve
Tan dist (TD): is the distance on the tangent, from the PC to the PI, or the PI to the PT, where the perpendicular
offset occurs.
Tan offset: is the distance, perpendicular to the tangent, to the curve at the particular station.
Tan: is the length of the tangent (the distance from the PC to the PI).
Tan - TD: is the distance on the tangent, from the PI to the PC, or the PI to the PT, where the offset occurs
Chord Offset: provides perpendicular offset information from the chord (the line from the PC to the PT) for each
station on the curve. PC deflection information is also provided. The results are given in the following format:
Station: is the current station on the curve.
Chord dist.: is the distance on the long chord from the PC (toward the PT) where the perpendicular offset
occurs.
Chord offset: is the distance to the current station on the curve, perpendicular to the long chord.
PC Deflection: is the angle to turn to the current station, as if occupying the PC and backsighting the PI.
Chord Length: is the distance from the PC to the current station on the curve.
The first known part of the curve is defined by one of the following:
[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.
The second known part of the curve is defined by one of the following:
[Delta]: is the deflection angle.
[Length]: is the arc length.
[Chord]: is the chord length.
[Tangent]: is the distance from the PC or PT to the PI.
[Mid Ordinate]: 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.
PC Station: is the starting station assigned to the PC.
Interval: When checked, all necessary information for each station at the specified interval on the curve will be
computed.
Start station: when not computing by interval (above), only the information for the particular station entered here is
computed.
[Solve]: will solve and display all the details of the specified curve, without the layout information.
[Sta -]: decreases the current station by the station interval.
[Sta +]: increases the current station by the station interval.
[Layout]: will solve and display the layout information for all the stations of the specified curve.
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