2001. U.S. Geological Survey. The National Land Cover Database 2001 urban imperviousness layer was produced through a cooperative project conducted by the Multi-Resolution Land ...
2006. U.S. Geological Survey. The National Land Cover Database products are created through a cooperative project conducted by the Multi-Resolution Land Characteristics (MRLC) C...
2011. U.S. Geological Survey. The National Land Cover Database products are created through a cooperative project conducted by the Multi-Resolution Land Characteristics (MRLC) C...