Three-dimensional trend analysis is an useful mathematical tool in geology. But the results of spatial distribution obtained in calculation are usually troublesome in analysis.
三维趋势分析是地质学中一种有用的数学工具，但是空间分布的计算结果造成了分析上的困难。
Rough set theory is a new mathematical tool to deal with vagueness and uncertainty. It is a soft computing method and can be used as a useful tool for intellective information processing.
粗集理论作为一种新的软计算方法，可以用作处理图像信息的含糊和不确定性问题的数学工具。
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