Acevedo2011 Proceedings Bethesda, Md. American Society for Photogrammetry and Remote Sensing 14-17 November 2011 2011 Forty years of Earth observations... understanding a changing world, William T. Pecora Memorial Symposium on Remote Sensing, 18th AcevedoWilliam Herndon, Va. presentation at National assessment of land cover change using the NLCD 1992-2006 database [abs.]