This method apply the length of the stadia as base line, survey the vertical angular of the two ends of the base ling by theodolite and get the distance between the station and stadia.
该方法是以视距尺的定长作基线，利用经纬仪测定基线两端点的竖直角，求出立尺点至测站点间的距离。
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.
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。
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