Data are taken from the National Land Cover Database - 2011 and represent land cover at a 30m X 30m resolution. location of data: National Land Cover Database - 2011
## OGR data source with driver: ESRI Shapefile
## Source: ".", layer: "states"
## with 51 features
## It has 5 fields
## OGR data source with driver: ESRI Shapefile
## Source: ".", layer: "tl_2011_us_county"
## with 3234 features
## It has 17 fields