Purpose-built scrap handler vs. converted excavator in satellite imagery

Anyone who's walked a yard knows the difference between a Sennebogen 830 and a Cat 336 with a grapple bolted on the stick. From a drone or a windshield, it's obvious. From 500mm-resolution satellite, it takes a little more work, but the tells are still there if you know where to look.

Get the call wrong and a fleet count overstates what a yard can actually process. A yard running three real material handlers moves a lot more tonnage per shift than a yard working two excavators with a grapple welded on, even though both show up on a quick count as five pieces of equipment.

Cab position is the first tell

Purpose-built handlers carry the cab high and offset, usually on a riser, so the operator can see over the grapple and down into a railcar, a barge, or a shredder in-feed. In an overhead shot you'll see the cab sitting noticeably forward and above the chassis centerline, sometimes with a visible gap or pylon beneath it.

A converted excavator keeps the cab where the factory put it: low and centered over the tracks, sized for digging sightlines. A cab that reads flush with the upperstructure and centered on the undercarriage marks a digging machine doing grapple work, whatever's hanging off the stick.

Undercarriage and counterweight tell the rest

Stationary and semi-stationary handlers run on a pedestal or pylon base with outriggers, not crawler tracks. In the image, outriggers show up as small square shadow pads set off from the main footprint, something a standard crawler excavator never has. Even the tracked and wheeled handler variants tend to carry a wider stance and heavier rear counterweight than a digging machine of the same boom length, because they're built to hold a loaded grapple at full reach rather than curl a bucket close to the cab.

Boom geometry backs this up. A handler's boom is built for reach and height, close to vertical when stacking scrap into a truck or feeding a shredder, with a knuckle joint partway up. An excavator's boom and stick are built for digging arc: shorter overall reach relative to the machine's footprint and a straighter working angle. At 0.5m GSD the joint itself won't resolve. The shadow the boom casts at a working angle is a decent proxy instead, especially with a low sun.

Paint color helps when it's there. Sennebogen green, Fuchs yellow-and-black, Liebherr yellow all read fine in RGB imagery when the machine is clean and the sun angle is decent. Color alone doesn't settle it, though. Yards repaint, attachments get swapped, and a generic yellow excavator with a grapple throws a false positive on color every time. Cab offset, counterweight mass, and undercarriage type are the tells that hold up across a dirty, faded, or repainted machine.

Why the distinction holds up on a quarterly pass

These tells don't require ground truth or a site visit. They're geometry and shadow, and that's exactly what a repeat satellite pass gives you every quarter: the same yard, the same footprint logic, a chance to confirm the machine on the lot is still the same class of equipment it was last quarter. A yard that's traded a converted excavator for a real Sennebogen between passes shows up as a change in cab offset and counterweight across two reads of the same spot.

That's the whole point of counting fleets this way instead of eyeballing one satellite frame and guessing. Scrapyard Fleet Mapping runs this read across every yard in a market on a quarterly cadence and hands back a per-yard count with the handler, loader, and crane-type breakdown already sorted out.

If you're trying to size a scrap market before you knock on the first gate, that breakdown is worth a look.