Unclassed choropleth maps assign color shadings in proportion to the data values so that the choropleth maps do not have to classify the data. Unclassed choropleth maps are not very widely accepted due to the fact that they are claimed to lose the ability of directing the message of communication. This Flash Density map of the United States shows the amount of lightning flashes per square km per year and proves that Florida is in fact the lightning capital of the world.
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