Changes

'''Artificial and modified surfaces''' are - according to the [[USDA]] terminology - ''"a [[general cover]] category consisting of roads and right-of-ways, buildings, parking lots, farmsteads and ranch headquarters, urban and built-up areas, small built-up areas, rural transportation, and any other buildings that have a surface area greater than 1,000 square feet."<ref>[http://www.nrcs.usda.gov/technical/NRI/1997/summary_report/glossary.html List of USDA terminology]List of USDA terminology</ref>''