介绍了中丝视距法测量水平距离和高差的基本原理及计算公式，并对其测量精度进行了分析。
This paper introduces a basic principle and calculation formula of measuring the horizontal distance and elevation difference by central hair stadia, and analyzes its measuring precision.
研讨复合型曲线视距横净距的计算，分析“规范”关于视距横净距计算方法的缺陷及局限性，提出通用计算法及其公式。
The paper analyses the drawback of the calculating method of lateral clear distance of the curves with fransitious provided by the specification and provides a common calculation method and formula.
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