#' Percent C3 Crop Cover for North America
#'
#' Gridded percent C3 crop cover layer for North America in the year 2000,
#' aggregated to 10' spatial resolution. Integrates geographic distribution of
#' global agricultural lands (Ramankutty et al. 2008) with distribution
#' of crop types (Monfreda et al. 2008), following rules described in Powell
#' et al. 2012.
#'
#' @docType data
#' @usage data(cropC3_NA)
#' @format An object of class \code{"RasterLayer"}; see
#' \code{\linkS4class{Raster}}.
#' @keywords datasets
#' @references Monfreda, C. et al. 2008. Farming the planet: 2. Geographic
#' distribution of crop areas, yields, physiological types, and net primary
#' production in the year 2000. -- Global Biogeochemical Cycles 22:GB1022.
#'
#' Powell, R. L. et al. 2012. Vegetation and soil carbon-13 isoscapes for South
#' America: integrating remote sensing and ecosystem isotope measurements. --
#' Ecosphere 3:109.
#'
#' Ramankutty, N. et al. 2008. Farming the planet: 1. Geographic distribution of
#' global agricultural lands in the year 2000. -- Global Biogeochemical Cycles
#' 22:GB1003.
#' @source \emph{Cropland and Pasture Area in 2000} and \emph{Harvest Area and
#' Yield for 175 Crops}. EarthStat.org: Global Landscapes Initiative,
#' University of Minnesota Institute on the Environment and Ramankutty Lab,
#' University of British Columbia, Vancouver: \url{http://www.earthstat.org/}
#' @examples
#' # Read in the data
#' data(cropC3_NA)
#' \donttest{
#' # Plot data layer
#' plot(cropC3_NA)}
#'
"cropC3_NA"
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