reading the signal…
Signals / Object / Street-level imagery
in San Francisco, CA·counted·356 all time
A coot is a dark waterbird, typically recognizable by its white bill and forehead shield.
Counted, not streamed: Coot 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.