Spectra Precision Survey Pro v4.5 Ranger User Manual - Manual (Page 163)

Other Conventional Surveying Tutorials
153
Parabolic Curve Layout
The Parabolic Curve Layout screen is useful to compute the locations
of any station along a vertical curve when two parts of the curve are
already known. The values computed can be written down and used
to later stake those stations in the field.
1. Tap Curve , Parabolic Curve from the
Main Menu.
2. In the Known field, select if the station and
elevation for the PVC or the PVI are
known by selecting the appropriate radio
button. Also specify if the Curve Length,
Point on Curve
, or High/Lo Elevation is
known from the dropdown list. (The
remaining information that must be
entered will vary depending on the choice
made here.)
3. Fill in each field with the remaining information that pertains to
your parabolic curve and tap Solve.
Note: The length of a parabolic curve is the horizontal distance from
the PVC to the PVT.
Note: The horizontal distance from the PVI to the PVC always equals
the horizontal distance from the PVI to the PVT