When working on choropleth maps or charts in Illustrator, sometimes the (final) data is not yet available by the time you’re designing the graphic.
The typical work-around is to re-import the updated part of the graphic and align it with the rest of the artwork. But this is tedious work, especially if you’re dealing with multiple maps.
To address this problem I wrote an Illustrator script that can re-color the artwork based on a JSON file. This blog post will walk you through how to use the script.