Unclassed choropleth maps are choropleth maps that have as many intervals as there are areal units (no set amount of intervals). This map shows the distribution of deliberate fire-starting across London by wards. Note that since there are as many intervals as there are areal units (wards), then one can only compare areal intervals relative to each other, but not by any orders of magnitude. For example, the most fires are in the dark red ward, and the least in the palest yellow. However, one would not be able to tell the difference between any given data set in between other than the fact that the color continuum would tell you one has either more or less incidents of deliberate fires.
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