Unclassed Choropleth map does not use numerical values like classed choropleth, but instead it uses a range color shades to portray lighter colors as low values and darker shades to represent the progressively higher values. This essentially filters out data details, and just let you see the general idea of a geographic pattern (of unemployment rate in this map). The limitation in this map is that although you can observe the pattern of high unemployment rate in California, you can't actually rank the counties in the state from low to high. Another main problem with this is that you can hardly match up the colors on the map to the legend, which makes it difficult for viewers to read.
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