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Parking lots may be a significant source of pollution, but up until now there has been no quantitative estimate of the areal extent of parking lots in the U.S.

This data release consists of a time series of five national 60-meter raster datasets which estimate the proportion of each pixel represented by parking lots, based on land-use coefficients. The rasters span the conterminous United States, for the years 1974, 1982, 1992, 2002, and 2012. The rasters provide a way to estimate percent parking lot area by watershed or other area of interest, over the last four decades. This is a valuable tool for land-use planners and others interested in the spatial extent of these important impervious surfaces.

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