Dot Distribution Map

http://www.birds.cornell.edu/pfw_fr/Members/ParticipantMap00.htm
A dot distribution map is a typ of point pattern map. When looking at a dot density map the size never varies and each dot can equal various amounts of people. Mainly these maps are used to show statistics of people in different areas. When looking at these maps, the dots can differ in color and size, but they all represent the same thing. For exapmple, different populations of people who participate in various activities. The dot density map above shows the number of people across North America which participate in feeder watches of birds in years 2000 and 2001.