中文说明：
利用离散余弦变换求取重力或磁异常的水平与垂直导数，简单实用。
English Description：
It is simple and practical to use DCT to calculate horizontal and vertical derivatives of gravity or magnetic anomalies.
Obtaining horizontal and vertical derivatives of gravity or magnetic anomalies by discrete cosine tr
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中文说明：
利用离散余弦变换求取重力或磁异常的水平与垂直导数，简单实用。
English Description：
It is simple and practical to use DCT to calculate horizontal and vertical derivatives of gravity or magnetic anomalies.
horizontal and vertical derivative
..................................\dx.m
..................................\dz.m