181
25. ROUTE SURVEYING
PROCEDURE
1. In the second page of the OBS mode
screen, press
[MENU]
, then select
"Road".
2. Select "3PT Curve" to enter the 3 point
calculation menu.
3. Input the coordinates of the BP point
(reference point). Press
[OK]
to set
the input values.
4. Input the coordinates of the IP point,
then press
[OK]
.
5. Input the coordinates of the EP point,
then press
[OK]
.
6. The IA ang (intersection angle),
direction (of curve), BP-IP (BP-IP
length), and IP-EP (IP-EP length) are
calculated from the coordinates of the
three input points. The results are then
displayed on the screen.
Check the data, then press
[OK]
.
• Press
{ESC}
to return to the previous
screen to make alterations to this
data.
7. Input curve properties: parameter A1,
parameter A2, curve radius, and St.
ofs (BP Point offset).
3 P T C u r v e
I P & Ta n
A l i g n m e n t
E D M
N p :
LOAD R E C
E p :
3 P T C u r v e / B P
1 0 0 . 0 0 0
O K
1 0 0 . 0 0 0
N p :
LOAD R E C
E p :
3 P T C u r v e / E P
3 0 0 . 0 0 0
O K
1 0 0 . 0 0 0
O K
3 P T C u r v e
B P - I P
I P - E P
1 4 1 . 4 2 1 m
I A
D i r e c t .
R i g h t
1 4 1 . 4 2 1 m
9 0 0 0 ’ 0 0 "
O K
3 P T C u r v e
S t . o f s
R a d i u s
6 0 . 0 0 0 m
0 . 0 0 0 m
P a r a A 1
5 0 . 0 0 0
m
P a r a A 2
5 0 . 0 0 0 m