Spectra Precision Survey Pro v4.6 Recon and Nomad User Manual - Manual (Page 95)

Road Layout
85
POB
The POB designates the location in the current job where the
alignment starts. The POB can be defined by an existing point or
specified coordinates and can be changed at any time. The VAL’s
start station elevation will be set from the POP.
Road Component Rules
The following section defines how the various components described
above work together to form the road. This information is important
because how each component reacts to the other component affects
the shape of the resulting road.
Alignments
1. The alignment must have both HAL and VAL segments.
2. The VAL must be equal to, or longer than the HAL.
Templates
1. For each side of the road
• All templates on a particular side of the road must have the
same number of segments for. The fist template for each side
of the road defines this number.
• The station for the first template for each side must match
the starting station of alignment.
• All template stations must be within the station range for the
alignment.
• All templates must have at least one segment.
• A template can contain one zero length segment making it
effectively a blank template, but the first segment must be
greater than 0.