R Beginners – Plotting Locations on to a World Map

April 2, 2013

(This article was first published on Doodling with Data, and kindly contributed to R-bloggers)

This post is targeted at those who are just getting started plotting on maps using R.

The relevant libraries are: maps, ggplot2, ggmap, and maptools. Make sure you install them.

The Problem

Let’s take a fairly simple use case: We have a few points on the globe (say Cities) that we want to mark on the map.

The ideal and natural choice for this would be David Kahle’s ggmap package. Except that there is a catch. ggmap doesn’t handle extreme latitudes very well. If you are really keen on using ggmap, you can do it by following the technique outlined in this StackOverflow response.
 If ggmap is not mandatory, there are simpler ways to do the same.

First, let’s set up our problem. We’ll take 5 cities and plot them on a world map.

Method 1: Using the maps Package

This results in:

Which might be enough. However, if you take the few extra steps to plot using ggplot, you will have much greater control for what you want to do subsequently.

Method 2: Plotting on a World Map using ggplot 


This results in:

To leave a comment for the author, please follow the link and comment on their blog: Doodling with Data.

R-bloggers.com offers daily e-mail updates about R news and tutorials on topics such as: Data science, Big Data, R jobs, visualization (ggplot2, Boxplots, maps, animation), programming (RStudio, Sweave, LaTeX, SQL, Eclipse, git, hadoop, Web Scraping) statistics (regression, PCA, time series, trading) and more...

If you got this far, why not subscribe for updates from the site? Choose your flavor: e-mail, twitter, RSS, or facebook...

Comments are closed.


Mango solutions

RStudio homepage

Zero Inflated Models and Generalized Linear Mixed Models with R

Quantide: statistical consulting and training



CRC R books series

Contact us if you wish to help support R-bloggers, and place your banner here.

Never miss an update!
Subscribe to R-bloggers to receive
e-mails with the latest R posts.
(You will not see this message again.)

Click here to close (This popup will not appear again)