This dot distrubution map is representing the hispanic population in the Los Angelos. These kind of maps are uses a dot to symbol a trend in a certain area. They rely on visual scatter to show spatial pattern. Another way a dot distribution map could be useful for would be displaying the outbreak of a virus or sickness in a particular area.
http://krygier.owu.edu/krygier_html/geog_353/geog_353_lo/geog_353_lo08.html
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