Thu, 21 Aug 2008 07:43:36 BST CiteULike: xtizons Owens http://www.citeulike.org/user/xtizon/author/Owens CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/xtizon/article/1276735 <i>Science, Vol. 316, No. 5825. (4 May 2007), pp. 736-738.</i><br /><br />Roads encroaching into undeveloped areas generally degrade ecological and watershed conditions and simultaneously provide access to natural resources, land parcels for development, and recreation. A metric of roadless space is needed for monitoring the balance between these ecological costs and societal benefits. We introduce a metric, roadless volume (RV), which is derived from the calculated distance to the nearest road. RV is useful and integrable over scales ranging from local to national. The 2.1 million cubic kilometers of RV in the conterminous United States are distributed with extreme inhomogeneity among its counties. 10.1126/science.1138141 Roadless Space of the Conterminous United States Raymond Watts Roger Compton John Mccammon Carl Rich Stewart Wright Tom Owens Douglas Ouren doi:10.1126/science.1138141 Science, Vol. 316, No. 5825. (4 May 2007), pp. 736-738. 2007-05-04T09:09:11-00:00 2007 Science 316 5825 736 738 distance graph measurement network