Fortify method for map objects — fortify.map • ggplot2

This function turns a map into a data frame that can more easily be plotted with ggplot2.

Usage

# S3 method for map
fortify(model, data, ...)

Arguments

model: map object
data: not used by this method
...: not used by this method

See also

map_data() and borders()

Examples

if (require("maps")) {
ca <- map("county", "ca", plot = FALSE, fill = TRUE)
head(fortify(ca))
ggplot(ca, aes(long, lat)) +
  geom_polygon(aes(group = group))
}


if (require("maps")) {
tx <- map("county", "texas", plot = FALSE, fill = TRUE)
head(fortify(tx))
ggplot(tx, aes(long, lat)) +
  geom_polygon(aes(group = group), colour = "white")
}