If all the highways, streets, buildings, parking lots, and other solid structures in the 48 contiguous United States were pieced together like a giant jigsaw puzzle, they would almost cover the state of Ohio. That is the result of a study by Christopher Elvidge of NOAA's National Geophysical Data Center in Boulder, Colorado, who along with colleagues from several universities and agencies produced the first national map and inventory of impervious surface areas (ISA) in the United States.
As calculated by the researchers, the total impervious surface area of the 48 states and the District of Columbia is approximately 43,480 mi^sup 2^ (the total area of Ohio is 44,994 mi^sup …
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