County polygons for Alabama, Georgia, and South Carolina plus an artifical variable used for coloring.
A data frame with coordinates of the vertices of the county polygons
y) and an artificial variable
z constructed for
illustrating colored maps.
Polygon data taken from maps package of Becker, Wilks, Brownrigg, and Minka (2012). Version 2.2-6. https://CRAN.R-project.org/package=maps
## generate color palette pal <- diverging_hcl(9) n <- length(pal) ## draw shaded polygons plot(0, 0, type = "n", xlab = "", ylab = "", xaxt = "n", yaxt = "n", bty = "n", xlim = c(-88.5, -78.6), ylim = c(30.2, 35.2), asp = 1) polygon(USSouthPolygon, col = pal[cut(na.omit(USSouthPolygon$z), breaks = 0:n/n)])
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