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Learning Raphaël JS Vector Graphics by Damian Dawber

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Choropleth maps

Choropleth maps are maps that show some particular area or region with an associated measurement or statistic. They are commonly used in cartography to depict population densities and similar metrics and are used regularly to visualize data with geographical significance. The following image, compiled using the https://commons.wikimedia.org/wiki/File:World_population_density_map.PNG and https://en.wikipedia.org/wiki/File:ElectoralCollege2012.svg Wikimedia Commons images, demonstrates applications in cartography (left) and in data visualization (right):

Choropleth maps

Creating choropleth maps

Often when you need to associate data with some geographical ...

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