“For most of human history, maps have been very exclusive,” said Marie Price, the first woman president of the American Geographical Society, appointed 165 years into its 167-year history. “Only a few people got to make maps, and they were carefully guarded, and they were not participatory.” That’s slowly changing, she said, thanks to democratizing projects like OpenStreetMap (OSM).

OSM is the self-proclaimed Wikipedia of maps: It’s a free and open-source sketch of the globe, created by a volunt…