“News of Boston public schools’ decision to go with the Peters projection has gone viral over the past week, and my teeth have not stopped itching,” Jonathan Crowe writes on his blog, The Map Room. “It is incredibly short-sighted and narrow-minded to say it should be one or the other,” says Mark Monmonier, author of Rhumb Lines and Map Wars: A Social History of the Mercator Projection. Even Ronald Grim, curator of the Norman B. Leventhal Map Center at the Boston Public Library, had concerns: “In my mind, both the Mercator and the Peters are controversial projections,” he says in a phone interview. “But we were not asked to be part of the decision.”
Choosing between map projections is a necessarily difficult task. The Earth is resolutely three-dimensional, and any attempts to smooth it out are going to add a certain amount of warping. It’s a balancing act: the more accurate you make the continents’ relative area, the more you have to distort their shapes, and vice versa. The art of cartography lies in choosing to privilege one or another of these accuracies—or finding a sweet spot between them that serves your particular purpose.
