A dot distribution map is a type of thematic map in which dots are used to represent something at a physical location. Dots can be used in a number of ways and sizes. The map I've selected is from the National Institutes of Health Office of Science Education. It shows, using dots, where in the lower 48 states over 350,00 copies of the NIH curriculum supplements have been sent to requesting teachers. The dots in the map are all the same size, and locations close together begin to look like blue blobs. This map on the web site toggles to a nighttime image of the U.S. This way you can compare requests to population density as indicated by nighttime light imagery.
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