两点平面直角坐标值之差值，即横纵坐标的增加值，称为坐标增量。
其关键点是导出了求估算步长的一个简单公式，从而很容易的由已知节点坐标求出到下一节点的坐标增量。
The key point of this method is that a simple formula has been derived for estimating step length. Therefore it is easy to find the unknown node coordinate from known one.
有些数据格式还提供m(度量)坐标，这通常用于时间增量。
Some data formats also provide an m (measure) coordinate, most often used for time increments.
计算坐标进给增量时要进行反复迭代，浪费时间。
Computing feeding increments of coordinate needs iterative calculating repeatedly, much time has been wasted.
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