Experimental isarithmic maps visualise electoral data
From the post:
David B. Sparks, a fifth-year PhD candidate in the Department of Political Science at Duke University, has today published a fascinating set of experiments using ‘Isarithmic’ maps to visualise US party identification. Isarithmic maps are essentially topographic/contour maps and offer an alternative approach to plotting geo-spatial data using choropleth maps. This is a particularly interesting approach for the US with its extreme population patterns.
Very impressive work. Read this post and then David’s original.
FYI:
Choropleth maps use city, county, etc. boundaries, within which colors appear.
Isarithmic maps use color to present the same information but without the legal boundaries that appear in choropleth maps.