reading the signal…
Signals / Object / Mapped places
in Potsdam, BB·counted·28 all time
Sand spread across a surface, typically appearing as a pale, loose layer on ground, paths, or beaches.
Counted, not streamed: Surface Sand 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.