When you think of making maps, you probably think of complicated, expensive tools like ArcGIS. What if I told you that you could make maps with R, a tool you already know how to use? | R for the Rest of Us
This tutorial explains how to create an advanced temporal heatmap with R and ggplot2. We’ll use measles data from US states between 1928 and 2011 as an example, highlighting the effect of vaccine introduction in 1963.| r-graph-gallery.com