Here is a series of choropleth maps I designed in Adobe Illustrator showing the percent of vacant housing units in the United States according to the 2011 American Community Survey by the U.S. Census Bureau. Both maps portray the same data only one is classified by natural breaks and the other is classified by equal interval. You can look at the map classed by natural breaks and quickly see the states with the greatest housing unit vacancies are on the east coast. The map seems to be more evenly distributed with each class having almost equal representation of states with exception of the last class. The map with an equal interval class scheme has more states in the lower classes and fewer states in the last 2 classes. When you look at the equal interval classed map you also notice that the greatest vacancies are located on the east coast. Overall the difference in class schemes doesn’t make a huge difference as it doesn’t leave any class without data. However, I prefer the map classed by natural breaks because I feel like it does a better job highlighting the differences.
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