Parabola - Sokkia CX-52 Operator's Manual

24. ROUTE SURVEYING

24.5 Parabola

The coordinates of the center peg and width pegs on a parabola can be found
from the coordinates of the reference point and curve properties.
It is then possible to proceed with the setting-out of the center peg and width pegs
• Select a calculation menu depending on the section of the parabola to be
calculated.
• Parabola is calculated by the following formula.
x 3
y = ----------- -
6RX

Abbreviations used in parabola calculation
BTC: Beginning of transition curve
BCC: Beginning of circular curve
ETC: End of transition curve
ECC: End of circular curve
Calculation using BTC Point as reference:
"BTCBCC Calculation 1"
160
AZ
Q
IP
Stationing
chainage
BTC
Offset
BP