Ruide RCS - Page 68

65

D
1
100 * tan(111°55′47″/ 2) +1.7(1 / sin111°55′47″)
–1.7(1 / tan 111°55′47″) +31.891
=148.06015 + 1.8326 + 0.6844 +31.891
=182.468
DD
21

(7) Calculation of the coordinate KA1

1
1
11
cos
D
NN
IPKA

1
111
sin
DEE
IPKA
Bearing from BP to IP1



1
74°03′16.6″

N
KA1
1300 –182.468 * cos 74° 03′16.6″=1249.872 m

E
KA1
1750 –182.468 * sin 74°03′16.6″=1574.553 m
(8) Calculation of Arc Length
)(
21

 LARL
=R(111°55′47″-2 * 18°20′06″)
=100( 75°15′35″
180


)
=131.353 m
(9) Calculation of the coordinate KA2

2
2
12
cos
D
NN
IPKA

2
212
sin
DEE
IPKA
Bearing from IP1 to IP2



2
322°07′30.1″

N
KA 2
1300 –(-182.468) * cos 322°07′30.1″= 1444.032 m

E
KA 2
1750 –(-182.468) * sin 322°07′30.1″= 1637.976 m
(10) Calculation of coordinates BC ， EC which is ARC (IP1,IP2,EP)
Arc length
IARCL 
IA= 95°52′11″