
169
25. ROUTE SURVEYING
Calculation using KE2 as reference: "KE
KA Calculation"
• If the following conditions are not met, coordinate calculation cannot be
performed.
"KA
KE Calculation 1":
0
≦
curve length
≦
2A
"KA
KE Calculation 2":
0
≦
KA
-
reference point curve length
≦
3A
0
≦
KA
-
target point curve length
≦
2A
"KE
KA Calculation":
0
≦
KA
-
KE curve length
≦
3A
0
≦
KA
-
target point curve length
≦
2A
PROCEDURE Calculation using KA Point as reference
1. In the second page of the OBS mode
screen, press
[MENU]
, then select
"Road".
2. Select "Spiral" to enter the spiral menu
then select "KA-KE 1".
KE point (P1)
KE tangential angle (AZ)
Clothoid parameter A
KE to KA curve length (L)
KE follow-up distance (DL1)
Target point follow-pu distance (DL2)
Route width (BL)
KE-KA
Curve length
Q Stationing Chainage
Stationing Chainage
KA
Q
KE
BP
AZ
R o a d
O c c . O r i e n .
L i n e
C i r c . C u r v e
S p i r a l
P a r a b o l a
K A - K E 1
S p i r a l
K A - K E 2
K E - K A