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 associations that may be discovered by map comparison are influenced by the nature of the map features being compared and by the criteria used for making the comparisons. The criteria of identity ...

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 ...