【例4-1]某初测导线如图已知C、C,边的真方位角A,=165°18°20″导线转角个数n = 92自C到Cg点横坐标增量Z△y=20.658Km平均纬度Φm= 38° 12'导线右角总和Z β = 16655°48' 35"实测C2-Cg3边的真方位角A,=69°41'54"检核该段导线角度观测成果
ANCα0BC.[解]·C～C的子午线收敛角1 = (yn-yo)= 20.658 (Km)1tg Φm = 8'46 "YR
Cg2-Cg3边坐标方位角的推算值:α,' = α +n×180°-Z β=69° 29' 45"Cq2-Cg3边坐标方位角的理论值α, = An - y = 69° 33' 08"角度闭合差fg = αn' -α,=-3' 23"限差F = ±25"~n+16 =±4°20"fg<Fβ该段导线角度观测成果符合精度要求
[例4-2]已知C点在中央子午线以东12.289km，起始边C-C,为高级控制点坐标方位角为α。=165°18＇20"其余数据同例4-1试检核该段导线角度观测成果ANINCo
解］C2点横坐标概略值Y g2 = 12.289+20.658 = 32.947kmYtg = 9'45"Cg2点处的子午线收敛角 =RC92-Cg3边坐标方位角的理论值α, = An- = 69° 32' 09"角度闭合差fβ=α’-α=-2′24"限差Fβ= ±25"~n+8 = ±4'10"fp<Fβ该段导线角度观测成果符合精度要求