the.com/dot density
Every dot is a person, every empty block is a policy decision.
means A dot density map places one dot per unit of population, letting spatial clustering reveal patterns that averages and color-coded regions hide.
from Traces back to 19th-century cartography, but the modern census-tract version took off once computers could randomly scatter millions of dots inside boundaries instead of hand-plotting them.
randomization mattersdots are placed randomly within an area, not at real addresses
racial dot mapsone dot per person by race exposed segregation invisible in choropleths
weldon cooper map2013 university of virginia map went viral nationwide
scale illusionzoom out too far and clusters merge into misleading blobs
for instance
racial dot map — dustin cable, 2013, mapped every u.s. resident from census data
nyt election dot maps — used to show vote margins by precinct in 2020 coverage
brandon martin-anderson map — 2010 open street map mashup, one of the earliest viral versions