Spectra Precision FOCUS 2 Series - Deflection Angle; Transition Coordinates

SPECTRA PRECISION FOCUS 2 SERIES TOTAL STATION USER GUIDE
B – Calculate Road Alignment
154
Deflection angle
Transition coordinates
For example:
= 64(1 − 0.0 1 0 2 +4 0.0 0 0 0 4 8 5−50.0 0 0 0 0 0)1 1
= 64 ∗ 0.98981
= 63.348
Similarly, the value of E is:
= 64(0.10666667 − 0.00078019 + 0.0000025 − 0)
= 6.777
This is an example of a symmetrical spiral transition: N1 = N2, E1 = E2.
τ
L
2
2A
2
----------
=
τ
1
64
2
280
2
⋅
---------------
0.32rad 0.32
180
π
---------
18°20′06″deg== = =
τ
1
τ–
2
=()∴
NA2τ 1
τ
2
10
------
–
τ
4
216
---------
τ
6
9360
------------
…–+




⋅=
EA2τ
τ
3
---
τ
3
42
------
–
τ
5
1320
------------
τ
7
7560
------------
…)–+


⋅=
N 80 2 0.32⋅ 1
0.32
2
10
------------
–
0.32
4
216
------------
0.32
6
9360
------------
– …++




⋅=
64 1
0.1024
10
----------------
–
0.01048576
216
----------------------------
0.001073741824
9360
----------------------------------------


–+


=
E 80 2 0.32⋅
0.32
3
----------
0.32
3
42
------------
0.32
5
1320
------------
0.32
7
7560
------------
–+ …–




⋅=