reading the signal…
Signals / Object / Mapped places
in Auberchicourt, HDF·counted·1 all time
A spoil heap, typically an irregular mound of excavated soil, rock, or mining waste.
Counted, not streamed: Spoil Heap 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.