Topcon ES-52 - Parabola Calculation

24. ROUTE SURVEYING
160
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.
 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"
24.5 Parabola
y
x
3
6RX
------------=
BTC
IP
Q
BP
Offset
Stationing
chainage
AZ