Wednesday, May 20, 2009

Less than a 1000 words

The info graphic on the front page story of today's Telegram, at first glance, looks useful. It's a color-coded map that shows the changes in municipal income from speeding tickets. On closer inspection, however, it's much less useful than a table of the same data:

I have friends and co-workers who are color-blind. Some have difficulty distinguishing just certain colors - red and green - for example. They know which traffic lights to obey by the position of the light, not the color. Other friends see no color at all, just shades of gray. Here's what the graphic might look like to them:

In addition, even for those with good color vision, you need to keep matching colors on the map with the key at the top of the graphic. It's wearying at best and error-prone at worst. Is, for example, Clinton's loss of revenue between 10-19% or 40-44%? The answer is in the text of the story.
If I had an extra 40 bucks, I'd donate a copy of Edward Tufte's The Visual Display of Quantitative Information to the Telegram reference desk.

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