5.6.1单导线的平差解算和精度评定 同理可得,闭合导线的纵横坐标条件为: ∑cosT"v,-∑-(y1-y)+Va+,=0 ∑△ +1 0 0 n+ )va +w=0 △ν +15.6.1 单导线的平差解算和精度评定 =   −  − + + = = + = + = n i x i i x n i n i n i i s w x T v y y v w i i 1 , 1 2 0 0 1 1 0 ( ) 0 1 cos      = + = + = =  − − + = n i y i i y n i n i n i i s w y T v x x v w i i 1 , 1 2 0 0 1 1 0 ( ) 0 1 sin   同理可得，闭合导线的纵横坐标条件为：