完整和不完整缓和曲线在AutoCAD中的精确表示  

Precise Displaying of Complete and Incomplete Easement on AutoCAD

作　　者：李全信[1] 叶刚[1] 

机构地区：[1]郑州市规划勘测设计研究院,河南郑州450052

出　　处：《城市勘测》2007年第1期61-65,共5页Urban Geotechnical Investigation & Surveying

摘　　要：提出了用三次样条曲线绘制缓和曲线的方法。基于缓和曲线参数方程可以用复合Simpson公式表示,推出了绘制完整缓和曲线所需等弧段数n和绘制不完整缓和曲线所需等弧段数n1的严密公式和简捷实用公式。通过算例分析,验证了本文所提出的绘制缓和曲线方法的有效性。The displaying method of easement in AutoCAD is proposed by using cubic spline in this paper. Considering the fact that the parametric equations of easement can be expressed by compound Simpson formulae,the rigorous or simple formulae for determining the number of equal -arc for fitting complete easement,and for determining the one for incomplete easement are derived. Finally,the two examples are given out to illustrate the feasibility and Validity of the displaying method.

关 键 词：完整缓和曲线 不完整缓和曲线 数学模型 样条曲线 绘制 节点 

分 类 号：P209[天文地球—测绘科学与技术]