
https://www.e-education.psu.edu/natureofgeoinfo/book/export/html/1553
A thematic map is a type of map or chart that is intended to show a particular theme in a geographic region. Themes often used in these maps can include include: population density, political standing, rainfall, median age, air pollutants, etc. Thematic maps are among the most common forms in geographic information produced by GIS. The map above shows population change in the United States by county from 1990 to 2000.
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