一、曲线正矢 1、正矢测量在曲线上两点间拉一弦线,弦线中点至曲线的垂直距离叫正矢(图16a)。正矢用以检查曲线的圆顺程度。为了测量正矢,从直缓点起沿整个曲线每10米设一个正矢点,并从直缓点和缓直点各向外延长10米,两端各多设一个点,逐点连续地进行正矢测量,所得结果叫实 1. The positive vector of the curve 1. The positive vector measure pulls the string between two points on the curve. The vertical distance from the middle point of the string to the curve is called the positive vector (Figure 16a). The positive vector is used to check the degree of roundness of the curve. In order to measure the positive vector, a positive vector point is set every 10 meters along the entire curve from the straight point, and extends 10 meters from the straight and slow straight points, with an additional point at each end. Positive vector measurement, the result is called real