The maps are available GeoJSON files which you can use with a site such as Flourish to create choropleths such as this.

Download the GeoJSON files here for the population map and the national economy map.

To use the map with Flourish:

• Save your source data as a CSV file with two columns, one for the ISO country code (three digit, two letter or three letter) and one for the choropleth variable
• Click New Visualisation
• Choose the World map
• Choose Data (next to Preview top centre)
• Click Upload data and load the GeoJSON file
• Use the dropdown next to Upload data to change to Upload data and merge
• Upload your CSV file
• Ensure that the correct columns have been chosen to match ISO codes between the two files
• Return to Preview
• Choose Points Layer and disable the demonstration points
• Choose Projection and choose an equal-area projection. Eckert IV is recommended
• Use Flourish's other capabilities - too numerous to describe - to modify your map to your preferences.

The GeoJSON format is based on real-world latitude and longitude. These are meaningless for a symbolic representation such as a cartogram. To take advantage of the wide range of tools which use the GeoJSON standard, the cartogram has been passed through the inverse of an equal-area projection in order to create a virtual globe where country areas are proportional to their populations. So, mapping the GeoJSON through any equal-area projection will produce a valid map with the countries still in proportion.

The GeoJSON file is provided under CC BY-NC licencing. You may share and adapt the maps for non-commercial use, provided that you provide attribution to this site and indicate any changes that you have made. Please use the email link if you would like to use the maps commercially.

Use the "email us" link for feedback, questions and suggestions for new variables.