The tangent offset method and the deflection angele method have been applied to setting out and surveying the curves in railways, highways and so on for many years.

• 铁路公路等曲线测设中,多少年来都是用切线支距法和偏角法。这两种方法都要求必须先测设曲线主点,然后在曲线上(包括端点)设站,再详细测设。