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 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 between the points. In the one-to-one dot map, … 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

Two very different types of dot maps have been developed, often leading to some confusion in terminology. In fact, many cartographers have suggested that they not be grouped into a single type of thematic map. Although they use very different … 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