How to do it...

To plot geographic data using the sp package, follow these steps:

  1. Load the sp and rgdal packages:
> library(sp) 
> library(rgdal)
  1. Read the data:
> countries_sp <- readOGR(".", "ne_50m_admin_0_countries") 
> airports_sp <- readOGR(".", "ne_50m_airports")
  1. Plot the countries without color:
> # without color 
> plot(countries_sp)
  1. Plot the countries with color:
> # with color 
> plot(countries_sp, col = countries_sp@data$admin)
  1. Add the airports. Do not close the previous plot:
> plot(airports_sp, add=TRUE)
  1. Plot the economic ...

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