Earth's midsection bulges in relation to the measurement from pole-to-pole, and the catastrophic land displacement caused a small reduction in the bulge, making the planet more round.
Transfer function for reduction to pole can be used to reduce directional oblique magnetic anomaly to vertical magnetic anomaly in frequency (or wavenumber) domain.
在频率(波数)域中利用化极转换函数可以将具有方向性的斜磁化异常转换为方向性不明显的垂直磁化异常。
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In order to overcome the unstableness of reduction-to-the-pole at low and intermediate latitude, there are varieties of methods of reduction-to-the-pole.