U.S. Conterminous Wall-to-Wall Anthropogenic Land Use Trends (NWALT), 1974-2012
This dataset provides a U.S. national 60-m, 19-class mapping of anthropogenic 
land uses for five time periods: 1974-1982-1992-2002-2012.  The 2012 dataset 
is based on a slightly modified version of the National Land Cover Database 
2011 (NLCD 2011) that was recoded to a schema of land uses, and mapped 
back in time …