Again, a subcategory of Thematic Maps, Flow Maps in particular show the movement between places. The map above is showing the movement of trucks across the U.S put out by the department of transportation. The different thickness in the lines indicates the quanity of flow of trucks. With an increase in thickness, the key indicated that this means an increase in the number of trucks moving from point A to point B. While that was the main focus of posting this example, the map above also a choropleth map with different shades of color indicating volume of flow state to state.
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