World Map

The data for plotting the World map comes from the maps (Brownrigg, 2014) package. We load the vector data for plotting a world map using map_data().

ds <- map_data("world")
head(ds)

##        long      lat group order region subregion
## 1 -69.89912 12.45200     1     1  Aruba      <NA>
## 2 -69.89571 12.42300     1     2  Aruba      <NA>
## 3 -69.94219 12.43853     1     3  Aruba      <NA>
## 4 -70.00415 12.50049     1     4  Aruba      <NA>
## 5 -70.06612 12.54697     1     5  Aruba      <NA>
## 6 -70.05088 12.59707     1     6  Aruba      <NA>

It is quite simple to plot the world map using ggplot2 (Wickham and Chang, 2014).

p <- ggplot(ds, aes(x=long, y=lat, group=group)) + geom_polygon()
p

Let us add some colour based on regions. Now there are many regions, so for the same of aesthecity we will turn off the legend.

p  <-   ggplot(ds, aes(x=long, y=lat, group=group, fill=region)) +
        geom_polygon() +
        theme(legend.position="none")
p