单词isopleth
n.: 【气】等值线
【气象学】等值线
等成分面
等位线
复数：isopleths
In this paper, the tracing and the calculation method of the point of intersection of isopleth and net line are developed.
本文讨论了等值线与网格线交点的追踪和计算方法.用此方法画出等值线图，处理方便，迅速，准确，占用内存少。
The isopleth drawing of rectangular grids and the principles and techniques of adjusting isopleth control points are described in detail.
详细描述了矩形网格等值线绘制、等值线控制点调节（控制点选择、移动、增加、删除）的基本原理和方法。
Isopleth Surface Drawing and Its Application to Engineering
等值面绘制及其工程应用