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。

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IV. Project survey: The line extends from the Xiapu Station of Wenfu Railway, joining Xi'nan Harbor operation area. Its length is 37.5 kilometers.

项目概况：本线从温福铁路霞浦站引出，接入溪南港作业区，线路长度约37.5公里。

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