Fortify method for map objects.

Description

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

Usage

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

Arguments

See Also

map_data and borders

Examples

if (require("maps")) {
ca <- map("county", "ca", plot = FALSE, fill = TRUE)
head(fortify(ca))
qplot(long, lat, data = ca, geom = "polygon", group = group)

tx <- map("county", "texas", plot = FALSE, fill = TRUE)
head(fortify(tx))
qplot(long, lat, data = tx, geom = "polygon", group = group,
 colour = I("white"))
}