This is a map that shows a particular theme connected to a geographic area. These can be social, political, economic or really any theme that can be related within a map of a specific theme. Historically one of the most important examples of a thematic map was the John Snow's Cholera map in published in 1854. This was one of the first examples that lead to the modern geographic information system or GIS, which today can be exploited by many of us to create customized maps of our own theme maps using software available over the Internet. The example of a thematic map I've selected is one showing the number of new businesses in the lower 48 states by county. The colors range from white or 0, to dark red or 7000+. This way one can quickly evaluate the areas of the U.S. that are producing new businesses and possibly jobs.
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