Spectra Precision Survey Pro v4.5 Ranger User Manual - Manual (Page 84)

User’s Manual – Conventional Mode
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roadbed, curb face, top of curb, ditch, etc. Each road alignment can
contain as many templates as required to define the roadway, but all
the templates used on one side of the road must have the same
number of segments.
Templates can be further modified using widenings and super
elevations:
Widenings are used to widen or to narrow the first segment of a
template. The remaining segments of the template are not affected.
This feature is intended to be a way of controlling the width of the
first segment, typically the roadbed, without having to create and
manage additional template files. Widening definitions basically act
as two templates that modify the first segment.
Super elevations are used to bank curves in the direction of a turn.
A super elevation accomplishes this by changing the slope of the first
segment of a template – the slope of any remaining segments will
remain unadjusted.
One super elevation defines a begin station and an end station where
the slope change begins and where it finishes the transition for one
side of a road. Therefore, to bank a two-lane road, four super
elevations would be required – one at the beginning and one at the
end of the curve for each side of the road.
A super elevation can either hinge at the outer edge of the first
segment, or at the centerline. Hinging at the center results in the
elevation of the outer segments to change. Hinging at the edge
results in the elevation of the centerline changing. Because of this,
Survey Pro will only allow you to hinge on edge for one side of a road.
If the other side is also super elevated, you will be forced to hinge
that side at the center so that an abrupt change in elevation does not
occur at the centerline.
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.