Dot Distribution Map

Dot Distribution Map- represent density using dots- each dot on the map represents a given object(s). 

http://serc.carleton.edu/eslabs/corals/4a.html

A dot distribution map represents density and location of a phenomenon. This map shows coral reefs- each dot is the location of a reef. From this map it is easy to see that all coral reefs occur within the tropic zones. On other maps, each dot could represent a household, 100 people, or a specific kind of business- there are endless options that could be mapped. They are useful to show density and the exact location of the phenomenon, which might be more generalized in a choropleth map.