Choropleth maps (also called thematic maps) visualize data as a function of geographic areas and, as with every map, you need a projection to convert the 3D shape of the earth to the 2D shape of your screen or piece of paper. This is not really an issue when mapping a small area (say census tracts in Massachusetts), but becomes an issue when mapping at the scale of the plant.
Designing choropleth maps: What projection to choose? tries to figure-out what map projection is the best. Obviously it has to be an equal-area projection, but which one?
For me: Equal Earth or Mollweide.
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