Topcon GM-100 Series User Manual

127
25. ROUTE SURVEYING
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"
Calculation using BCC as reference: "ECCETC Calculation"
25.5 Parabola
y
x
3
6RX
------------=
BTC
IP
Q
BP
Offset
Stationing
chainage
AZ
ECC-ETC
Q Stationing Chainage
Stationing Chainage
ETC
Q
ECC
BP
AZ
Curve length

Topcon GM-100 Series Specifications

General

Brand	Topcon
Model	GM-100 Series
Category	Measuring Instruments
Language	English