Dots are aggregated by and placed randomly within 8-digit hydrologic units. Each red dot represents 2,000 acres of forest land converted to developed land.
Developed land is a combination of urban and built-up areas and rural transportation land.
There were 5,617,600 acres of land converted to developed land from 1982 to 1992. Use this map only to identify broad spatial trends. Within an 8-digit hydrologic unit, dot counts represent total acreage, with an error of plus or minus one dot to account for remainders. Data are not available for Alaska or the Pacific Basin. Data for Puerto Rico and the U.S. Virgin Islands are aggregated by 6-digit hydrologic unit.