Spectra Precision Survey Pro v4.9 - Manual (Page 48)

Start Station: The station on the alignment that corresponds with the starting location or point.
Edit Alignment Screen – General Tab
The General tab in the Edit Alignment screen is used to describe the alignment and select the layer where it is located.
Description: The description of the alignment.
Layer: The layer where the alignment will be located.
[Attributes]: Opens the Point Feature Attributes screen where the feature attributes for the alignment can be selected.
Edit Segment
The Edit Segment screen is accessed anytime an existing horizontal or vertical segment is added or edited. A variety of
segment editing screens are possible depending on the type of segment being edited or created. Each segment editor is
discussed below.
Edit Segment - Line Card
The Line card is used to add a straight horizontal line segment in the alignment.
Length: The horizontal length of the line.
Make this segment tangent to previous: When checked, the specified line will be tangent to the ending tangent of the
previous segment.
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. This does not hold true for vertical alignment segments. Vertical segments
will always begin with the specified starting grade unless they are manually modified.
[Azimuth] / [Bearing]: 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.
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