Spatial distribution maps and (semi -) variograms that can explicitly explain the random and structural variability of soil salinity were also mapped.
绘制了各土层盐分的随机性和结构性的半方差图以及空间分布图。
In order to research the spatial distribution law of the regional industrial structure, the self organization maps method is used to cluster and analyze the regional data in China 2003.
为了研究地区产业结构的空间分布规律，采用自组织映射的聚类方法，对2003年中国省级地区的产业结构进行了聚类分析。
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