Spectra Precision Survey Pro v4.5 Ranger Reference Manual - Manual (Page 80)

Survey Pro Reference Manual
R-72
Note: When making a new horizontal segment tangent to the
previous segment, the new segment will appear in the Edit
Alignment screen tagged with a (P). This means that if the previous
horizontal segment is edited or deleted, where the orientation
changes, all subsequent horizontal segments that have the (P) tag
will also be adjusted so they will remain tangent to the previous
segments.
Azimuth / Bearing : is used to enter a known azimuth or bearing
of the line.
: adds the line to the current horizontal alignment.
Edit Segment – Arc (Horizontal Curve) Card
The Arc card is used to add a horizontal curve to the alignment.
The curve can be defined by two of the
following:
• Radius : The distance from the radius
point to the curve
• Delta : The internal angle from center
to tangent points.
• Degree Arc : The internal angle
equivalent to a 100-ft arc length.
• Degree Chord : The internal angle
equivalent to a 100-ft chord length.
• Length : The arc length.
• 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.