Spectra Precision Survey Pro v4.9 - Manual (Page 49)

[Chord]: The chord length.
[Tangent]: The distance from the PC or PT to the PI.
[Mid Ord]: The distance between the curve and the chord at the center of the curve's length.
[External]: The minimum distance between the PI and the curve.
Turn: Specifies if the curve turns to the Left or Right as you face the curve from the beginning.
Make this segment tangent to previous: When checked, the start of the specified curve will be tangent to the ending
tangent of the previous segment.
[Azimuth] / [Bearing]: Used to enter a known azimuth or bearing at the start of the curve.
: Adds the curve to the current horizontal alignment.
Edit Segment - Spiral Card
The Spiral card is used to add a spiral curve to the alignment.
Radius: The radius of the spiral. (This equals the radius of the horizontal curve tangent to the spiral.)
Length: The length of the spiral.
Turn: Specifies if the curve turns to the Left or Right as you face the curve from the beginning.
Dir: Specifies if the curve runs from TS to SC (Tangent to Spiral, to Spiral to Curve) or CS to ST (Curve to Spiral, to
Spiral to Tangent).
Make this segment tangent to previous: When checked, will automatically turn the spiral so the beginning is tangent
to the end of the previous segment.
[Azimuth] / [Bearing]: Used to specify a known azimuth or bearing of the start of the spiral.
Edit Segment - Vertical Grade Card
The Vertical Grade card is used to enter a segment with any grade.
Length: The horizontal length of the segment.
Grade: The grade (slope) of the segment.
Get Previous Grade: Automatically enter a grade equal to the grade at the end of the previous segment.
Edit Segment - Vertical Curve
The Vertical Curve card is used to enter a parabolic vertical curve to the alignment. Length: is the horizontal length of
the vertical curve.
Start Grade: The starting grade of the vertical curve.
End Grade: The ending grade of the vertical curve.
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