Choropleth Map

http://en.wikipedia.org/wiki/Choropleth_map

This Choropleth map shows both the total population and the population density of Boston Massachusetts in 2000. The way the map is set up is that there were specific block groups that the Census used to find their numbers. This map is interesting because of how they specify the different maps but use them to compare one another. One change I would make is to maybe have one map one group of colors and the other a completely different set of colors.