卵形曲线的坐标计算

Coordinate calculation of oval curve

由于路线的转向及大小圆曲线位置先后不同,指出卵形曲线中间段回旋线起点M的切线方位角和坐标计算情况,具体介绍了路线右转且大圆曲线在先小圆曲线在后的计算公式及计算过程。

Because they are different in road changing direction and the location size circular curve, it puts forward a few situations of tangent line directing angle and coordinate calculation of convoluting line starting point M in oval curve middle part, concretelly introduces the calculating formula and process of road turning to right, first big circular curve and then small circular curve.