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黄河流域文物保护单位空间分布特征及其影响因素
周成1(), 柳炳华2, 张旭红3(), 田娟1, 周霖4
Spatial distribution characteristics and influencing factors of heritage conservation units in the Yellow River Basin
Cheng Zhou1(), Binghua Liu2, Xuhong Zhang3(), Juan Tian1, Lin Zhou4

图2. 黄河流域文保单位的标准差椭圆

Fig.2. Standard deviation ellipse map of heritage conservation units in the Yellow River Basin