countryCentroids: Point locations of countries
In dtkaplan/DCF-devel: Distributing materials for the DCF course

Description Usage Format Details Source Examples

Gives the latitude/longitude centroid for each country. This is useful for making dot or other geom_point layers for each country.

1	data("countryCentroids")

A data frame with 241 observations on the following 6 variables.

name: common names of countries
iso_a3: country codes in ISO_a3 format: unique three letter code
long: longitude of the country's centroid
lat: latitude
group: needed for ggplot compatibility (really?)
order: needed for ggplot compatibility (really?)

This was generated by by averaging the polygon boundry points for each country.

The original shapefile comes from www.naturalearthdata.com/download/50m/cultural/ne_50m_admin_0_countries.zip

## Not run: 
population <- CIAdata(2119)
population2 <- left_join(population,mutate(countryCentroids,country=name))
p <- makeWorldMap(population,'country')
p +  geom_polygon( color='gray', fill=NA) + # for the boundaries
  geom_point(data=population2, aes(x=long,y=lat,size=sqrt(pop)))

## End(Not run)