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ndvi.R
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ndvi.R
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#' NDVI in Africa (1990)
#'
#' Normalized Difference Vegetation Index Grid: A subset of 7 by 7 square raster grids with 10 arcminute spacing roughly situated around the border between the Central African Republic, Sudan and Congo, drawn from the NOAA 1990 Global Change Database.
#'
#' Sf object, unprojected. EPSG 4326: WGS84.
#'
#' @format An sf data frame with 83 rows, 60 variables, and a geometry column:
#' \describe{
#' \item{ PolyID}{ Grid cell identifier }
#' \item{ GREEN }{ Greenness vegetation index, based on AVHRR }
#' \item{ TEMP }{ Temperature in 1/10 degree celsius }
#' \item{ ELEV }{ Elevation in meters }
#' \item{ PREC }{ Precipitation (mm per year) }
#' }
#' @source Anselin, L. (1993). Discrete spatial autoregressive models. In M. Goodchild, B. Parks and L. Steyaert (Eds.), Environmental Modeling with GIS, pp. 454-469. New York: Oxford University Press. Table 46.2 on p. 455.
#'
#' @examples
#' if (requireNamespace("sf", quietly = TRUE)) {
#' library(sf)
#' data(ndvi)
#'
#' plot(ndvi["ELEV"])
#' }
"ndvi"