[mattbrewsbytes]

I wonder if there is a system to dumps where they can kinda triangulate an area and general depth to a calendar of when things were put there?

Talk about a needle in a haystack.

[yostrovs]

Garbage trucks these days often have cameras that film when a dumpster is picked up and dumped into the truck. Perhaps the same is done during unloading.

[giantg2]

Yes, they generally can.