Datasets About Order by Relevance Name Ascending Name Descending Last Modified Popular Go 1 dataset found Formats: .sas7bdat PDF Tags: Imperviousness Land Cover Philadelphia Tract Filter Results Average percent impervious National Land Cover Dataset (NLCD) Contiguous US Average percent impervious National Land Cover Dataset (NLCD) Tract Contiguous US 2016 to 2019 CSV .sas7bdat PDF