A thematic map is one that displays the special distribution of an attribute that relates to a single topic, theme or subject of discourse. Highlighting or employing different colors and patterns is a common defining factor. These maps can also be used to display geographical concepts such as density, distribution, relative magnitudes etc.
In this example, we are observing the lower 48 states by range to see in detail what activities are wanted the most. The shading begins light and increases in color towards a deeper red signifying more businesses.
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