Spectra Precision Survey Pro v4.5 Ranger Reference Manual - Manual (Page 398)

Survey Pro Reference Manual
R-390
Parabolic Curve
Curve Parabolic Curve .
The Parabolic Curve screen provides detailed information on a
vertical parabolic curve when certain parts of the curve are known.
Known: The PVC or PVI radio button is
selected to define which point on the curve is
known.
One of the following options must be selected
from the dropdown list:
• Curve Length: is selected when the length
of the curve is known. When selected the
following must also be specified:
o Curve length
: is the length of the
vertical curve (the horizontal distance
between the PVC and PVT).
• Point On Curve: is selected when the location of another point on
the curve is known. When selected, the following must also be
specified.
o Station
: is the station where the other point is located on the
curve.
o Elevation
: is the elevation of the other point.
• Hi/Lo Elevation: is selected when the high or low point for the
curve is known. When selected, the following must also be
specified.
o Hi/Lo Elevation
: is the elevation of the curve at the location
where the tangent is zero (the crest of the curve).