Create a data frame of map data.

Usage

map_data(map, region = ".", exact = FALSE, ...)

Arguments

map
name of map provided by the maps package. These include county, france, italy, nz, state, usa, world, world2.
region
name of subregions to include. Defaults to . which includes all subregion. See documentation for map for more details.
exact
should the region be treated as a regular expression (FALSE) or as a fixed string (TRUE).
...
all other arguments passed on to map

Description

Create a data frame of map data.

Examples

if (require("maps")) { states <- map_data("state") arrests <- USArrests names(arrests) <- tolower(names(arrests)) arrests$region <- tolower(rownames(USArrests)) choro <- merge(states, arrests, sort = FALSE, by = "region") choro <- choro[order(choro$order), ] qplot(long, lat, data = choro, group = group, fill = assault, geom = "polygon") qplot(long, lat, data = choro, group = group, fill = assault / murder, geom = "polygon") }