These types of maps make use of a black dot to display the presence of a given factor at the location where the dot is located. This type of map are used to display the prominence of a feature in a given location. The dot distribution map above shows where duckweed can be found around the world. One would be able to tell where duckweed is the most common around the world.
http://www.mobot.org/jwcross/duckweed/Habitat/geography.html
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