reading the signal…
Signals / Object / Street-level imagery
in Madison, WI·counted·593 all time
Loose litter, dirt, or discarded materials scattered along a paved pedestrian sidewalk.
Counted, not streamed: Sidewalk Debris has no time series, so it is read as a footprint across places. All-time count by city.
Things that physically exist: street furniture, signs, buildings. All-time counts.