choropleth

5 posts
Choosing color palettes for choropleth maps

Choropleth maps, the ones where regions are filled with colors based on data, grow easier to make. However, choosing colors, the number of colors, and the breakpoints is often less straightforward, because the answer is always context-specific. Lisa Charlotte Rost, now at Datawrapper, provides a rundown of the decision process. The explanation is in the context of the Datawrapper tool, but you can easily apply the logic to your own...

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Mapping South Korea’s Total and Foreign Populations — by Municipal District

South Korea, my adopted home for almost two years, has about 50 million residents as of the last census, in 2015. Most of them are settled in the country’s urban areas. About 22 million residents, for example, live in Seoul, the capital in the country’s northwest corner, and its adjacent province, Gyeonggi. As an experiment to create a choropleth map with D3 and NPR’s dailygraphics rig, which drives most of...

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Mapping Where ‘Americans’ Live

Back during the Republican primaries, The Upshot published an interesting short post called the Geography of Trumpism. The reporters back then analyzed hundreds of demographic variables, by county, in an effort to determine which ones might be predictive of electoral support for the eventual GOP nominee. Think: What’s the rate of mobile home ownership? Or what percentage of people in a particular place have college degrees? They found a key...

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Bivariate choropleth how-to

Your standard choropleth map shows geographic areas colored by a single variable. You're reading this, so you've seen them before. What if you have two variables? Then maybe a bivariate choropleth map. Cartographer Joshua Stevens describes the method and how to make one in open-source mapping software QGIS. Ideally, you should at least have a hunch two variables are related when creating bivariate choropleth maps. This is because bivariate maps...

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Members Only: Choropleth Maps and Shapefiles in R

Fill those empty polygons with color.Continue reading →

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