My current feeling is that this means changing it from a chloropleth map into a proportional circle map (big circle for census tracts with many visitors).
I still like this idea. I think we just want to change the census tract map to proportional circles, while leaving the county and state level maps as chloropleths
My current feeling is that this means changing it from a chloropleth map into a proportional circle map (big circle for census tracts with many visitors).