SPECTRA PRECISION FOCUS 2 SERIES TOTAL STATION USER GUIDE
B –
Calculate Road Alignment
155
Shift value
Δ
R
Δ
R
=
E
−
R(1
−
cos
τ
)
Δ
R
=
6.777
−
100(1
−
cos18°20’06’’
)
=
1.700
Symmetrical spiral transition:
Δ
R1
= Δ
R2
Spiral transition coordinates
N
m
=
N
−
R s i n
τ
= 63.348-100sin18°20’06’’ = 31.891
Symmetrical spiral transition: N
m1
=
N
m 2
Tangent distance
In this example:
LA
111
°
55
′
47
″
1
LA
sin
----------------
1
LA
tan
----------------
=
cot
,
=
csc
,
=
D
1
R
LA
2
--------
tan
R
2
LA
(
)
csc
Δ
R
1
LA
(
)
cot
Δ
N
ml
+
–
+
=
LA
111
°
55
′
47
″
1
LA
sin
----------------
1
LA
tan
----------------
=
cot
,
=
csc
,
=
D
1
100
111
°
55
′
47
″
2
⁄
(
)
tan
1.7 1
111
°
55
′
47
″
sin
⁄
(
)
1.7 1
111
°
55
′
47
″
tan
⁄
(
)
31.891
+
–
+
×
=
148.06015 1.8326 0.6844 31.891
+
+
+
=
182.468
=
D
1
D
2
=
