This example of an unclassed choropleth map is illustrating the number of Internet users in Europe, by country. A continuous scale of limited colors is being used to represent the variable. It is hard to distinguish the color differences between some of the countries (areal unit) but they are each represented by one shade (interval). I think that a more diverse range of color might make this map easier to read and understand. Link to website source:
http://www.esds.ac.uk/international/news/pastnews.asp
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