该模型以最短曲线段长度为目标函数，定量地考虑了影响轨道设计与控制的主要因素。
The new model regards the length of curve section as its objective, in which main factors affecting 3 D trajectory design & control are considered quantitatively.
切线是一条直线，刚好接触到曲线，所以跑切线是从一个弯道跑到另一个最短的距离。
A tangent is a straight line that just touches a curve, so the concept of "running the tangents" is to run the shortest distance possible by running straight from one curve to the next.
基于曲线最短路径和方向偏移判据，主曲线检测的所有运算都在图形表达中进行。
Based on the criteria of the shortest path of curves and directional deviation of paths, principal curve detection is carried out in graph domain.
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