I haven't yet tried this, but it looks like a nice package
In one recent project I needed to draw several maps and visualize different kinds of geographical data on it. I found the combination of R/ggplot/maps package extremely flexible and powerful, and produce nice looking map based visualizations.
Here is a short tutorial,
monospace font indicates the code you need to run in R. You probably need some basic understanding of R to work through this tutorial.
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