数学上的专用术语，指路线交点至曲线起点或终点的直线距离。常常用于圆的切线长及切线长公式。
介绍了测设和检验圆曲线的两种新方法：任意角夹角法和任意切线长支距法。
This paper presents two kinds of new methods for setting out circular curve: free angle and tangent length method.
实验证明，改进后的枝切线长度和不连续长度显著减少，解缠结果的精度明显提高。
Experiments prove that the length of branch-cuts and magnitude of discontinuities are remarkably reduced and unwrapped results are evidently improved with branch-cuts optimized.
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