Point Calculation - Sokkia CX-62 Operator's Manual

6. Press [OK] in the screen shown in
step 5 to calculate the center peg
coordinates. The coordinates are then
displayed in this screen.
7. Press {ESC} three times to finish
Parabola calculation and return to
<Road>.

• ECC-ETC curve length/ECC stationing chainage/Q stationing chainage (Set
out pt sta) input range: 0.000 to 99999.999 (m)

25.6 3 Point Calculation

The coordinates of a cardinal point, an arbitrary centerline peg, and width pegs
can be found from the coordinates of 3 IP points and curve properties.
It is then possible to proceed with the setting-out of the cardinal point, arbitrary
center peg, and width pegs
KA1
DL
BL
P1
Offset
• When parameter A1, parameter A2 and radius R have all been input a clothoid
is created and the KA1, KE1, KE2 and KA2 points can be found.
• When parameter A1 and parameter A2 have been input and radius R is "Null",
a clothoid without a transition curve is created and the KA1, KE1, and KA2
points can be found.
• When parameter A1 and parameter A2 are both "Null" and only radius R has
been input, a circular curve is created and the BC point and EC point can be
found.
P2
KE2
KE1
R
A1
A2
Q
P a r a b o l a / C L p e g
N
E
A z m t h
WIDTH
Parameters input:
BP point (P1)
IP point (P2)
EP point (P3)
KA2
Intersection angle
Direction of curve
BP-IP length
IP-EP length
P3
Clothoid parameter A1
Clothoid parameter A2
Curve radius (R)
Route width (BL)
Route width (BL)
Stationing to CL peg (DL)
180
25. ROUTE SURVEYING
4 7 5 0 9 0 . 3 1 1
2 0 3 9 0 5 . 1 8 6
2 6 5 8 ' 2 6 "
REC S-O CENTER