The First Thematic Maps

Zachary Forest Johnson provides “a quick outline of the first maps created with six common cartographic symbologies. … The six symbologies are the classic thematic cartography representation methods: choropleth, proportional symbol, dot density, flow, isarithmic, and cartogram.” Only one of them predates the 19th century.

Posted on Monday, November 9, 2009 at 6:34 PM
Categories: History of Cartography

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