92
Programs
Leica TPS800-4.0.0en
3. Quadratic parabola
A quadratic parabola has the advantage that the
rate of change of grade is constant thus resulting in
a "smoother" curve. A quadratic parabola has to be
defined by:
•
Start Chainage and Start Height of P1
•
End Chainage and End Height of P2
•
Parameter
•
or length (L), grade of entry straight (Grade In)
and grade of exit straight (Grade Out)
P1
Start point
P2
End point
L
Length
%
Slope
TPS800_Z109a
P1
+%
-%
P2
L
TPS800_Z109b
+%
-%
P1
P2
L