曲线拟合程序，用于拟合公路曲线的拟合，包括直线，圆曲线，和缓和曲线-Curve fitting procedure for fitting road curve fitting, including linear, circular curve, and the transition curve

利用神经网络对数据采集点进行曲线拟合分析误差-in order to match the functions by BP(Back Propagation)