对高等级公路附合导线角度平差公式的说明

A little explanations of the angle balancing equation of the high gradation road collateral conducting wire

高等级公路测量中，为确定导线点的质量及精度是否符合规范及有关规定要求，需要经常对导线点进行复测并且进行平差计算，但由于附合导线存在“回头”现象，角度平差公式此时会不具普遍性，对附合导线角度平差公式进行了说明，并以实际算例对特殊情况下附合导线角度的平差公式进行了补充说明。

In the measurement of high grade road the repetition measurement between the conducting wires points and the field observation calculation are usually needed to ensure the quality and precision between the conducting wires points meeting the standard and related defines. But the angle balancing equation is not universal because of the lyre-shaped phenomenon of the collateral conducting wires. In this text the angle balancing equation of collateral conducting wires is explained, and the angle balancing equation of collateral conducting wires is explained complementally with the actual example in the special status.