Attributes for NHDPlus Catchments (Version 1.1) for the Conterminous United States: NLCD 2001 Imperviousness
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This data set represents the mean percent impervious surface from the Imperviousness Layer of the National Land Cover Dataset 2001 (LaMotte and Wieczorek, 2010),...
本数据集采用2001年全国土地覆盖数据集(National Land Cover Dataset)不透水面层(Imperviousness Layer)中的平均不透水面百分比数据(LaMotte与Wieczorek,2010)



