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

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