Creating cartographic colormaps from graffiti photos
Lots of vans and trucks in the Mission District are covered with graffiti, so you constantly see a revolving set of truck murals. These often overlap with names, shapes, and faces you see in graffiti murals in alleys. This photo of a truck was snapped in front of Philz Coffee on 24th Street and Folsom in San Francisco.
More details on the charlesreid1.com wiki.