等角线是用于测量方向的变量的轮廓线。
An isogon is a contour line for a variable which measures direction.
研究结果还表明，异常的明显程度还与测量方向有关。
The result of study has also shown that the obvious degree of the anomalies is related with the measuring direction.
利用地球磁场来测量方向是人类历史上最古老的测量方法之一。
In the humanity history, it is one most ancient measuring technique surveying the direction using the Earth magnetic field.
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