Design
So You've Decided to Map Sidewalk Poop in San Francisco...
Sorry to say you'll discover that much of it is attributed to humans.
San Francisco is a weird magnet for poop. Travel around the city in the grimmest of Easter Egg hunts, and you'll find turds basking on sidewalks, chilling in flower gardens, gumming up subway escalators—hell, you'll even find them littering the roof of a three-story building with no roof access.
I assumed upon moving here this was the marking of irresponsible dog owners. I wish I could still believe that. But Jennifer Wong has torn the brown veil asunder with "(Human) Wasteland," a revolting map of all the anthropogenic excrement around San Francisco.