The idea of using dots to show relative density came about during the Industrial era of England and France in the 1830s and 1840s, a time when most modern types of thematic map were developed into a relatively modern … See more

One concern with dot density that has been studied at length is how accurately map readers can interpret the apparent density. Since the 1930s, repeated studies have shown a … See more

Two very different types of dot maps have been developed, often leading to some confusion in terminology. In fact, many cartographers have … See more

The design of either type of dot map involves balancing the design of the individual point symbol (especially its size) with the spacing … See more

• Racial Dot Map: detailed interactive district-based dot map of race and hispanic status from the 2010 Census with a 1:1 dot value
• OmniSci Tweetmap: a 1:1 dot map of geocoded twitter postings that can be filtered by keywords See more