“Mapped: Every Protest on the Planet Since 1979

This is what data from a world in turmoil looks like. The Global Database of Events, Language, and Tone (GDELT) tracks news reports and codes them for 58 fields, from where an incident took place to what sort of event it was (these maps look at protests, violence, and changes in military and police posture) to ethnic and religious affiliations, among other categories. The dataset has recorded nearly 250 million events since 1979, according to its website, and is updated daily.

John Beieler, a doctoral candidate at Penn State, has adapted these data into striking maps, like the…