John Gerth, of the computer science department at Stanford, sent a link to a powerful illustration, by Latoya Egwuekwe, of the spreading effects of unemployment across the country during this ...

The choropleth mapping technique, which uses "ranges" or "graduated color," is a type of thematic mapping that focuses usually on a single theme with data summarized by statistical or administrative ...

Would you like to make a color-coded choropleth map in R? Until recently, working with geospatial objects was a bit more complex than with many other types of data. That’s because R “Spatial Polygons ...