The two maps belows depict the number of internet users and the rate of internet usage as percentage of population by countries. The first map is a dual aixis map, which has two visual variables overlay on one another. In the case of this map, the color represents the rate of internet usage and the circle size represents the number of internet users. The second map is a dual encoded circle map, which encodes two visual variables simultenously within the circles. The color of the circles represents the rate of internet usage, and the size of the circles represents the number of internet users. The dual encoded circle map commuciates the information more efficiently than the dual aixis map because it is easier to read and less intimidating. Nonetheless, the audience still has to take some time to decode the map. A better alternative presentation might be just present one variable with the map and another variable with an inset table (i.e. top 10 and bottom 10 countries). ...
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