I came across a startling map on Maps Mania today. Back in May 2013 Monica Stephens, and colleagues, published online maps showing twitter data that contained hateful words related to homophobia and racism. The message communicated by the maps is quite strong and shocking – racism and homophobia are extremely strong in the eastern half of the United States. The problem however is that these maps lie and are artifacts of poor cartographic methodology.
I have spoken about inappropriately sized symbols in the past before. While generating some of the graphics for those articles I realized that it would be quite easy to generate the symbols automatically based on their values rather than trying to size them manually within the graphics editor. This could prevent myself as well as others inadvertent editing mistakes as well as methodological ones where people simply do not consider the correct representation of symbols.
Check out the resulting Cartographic symbol generator page for more details.
I’ve spoken before about the great cartographic course I took during my undergrad that referred to the book How to Lie with Maps. Many of the lectures (and examples in the book) contained examples of chart and map errors/propaganda/lies. Since then I have kept an eye out for other examples. I am often rewarded with examples such as this: