#36 Standardized Choropleth Maps

Data displayed on choropleth maps has been standardized or set to the same standard to allow readers to compare data from different locations from withon the map. The map below shows population per square of the United States on a state by state basis.

>Source: http://upload.wikimedia.org/wikipedia/commons/thumb/7/78/USA_states_population_density_map.PNG/800px-USA_states_population_density_map.PNG