>> 
>> If you had street-level imagery that may change things?
> 
> As Graeme says - you cannot tell from satellite imagery.

on this particular imagery, I can tell because they are trucking distribution 
warehouses, which have a distinctive cantilevered roof that is easily 
discernible form imagery,such as this one: 

https://www.openstreetmap.org/way/500728029 
<https://www.openstreetmap.org/way/500728029> (with an attached roof)mapped on 
it

if it was just a storage warehouse for a random company, it would be 
impossible, but these are easy. 

> 
> building=yes on the whole lot of it. Maybe add a "note=warehouse? and part 
> building=roof, layer=1”?

we do have building=warehouse, an iD preset with it’s own custom icon. 

if the building and roof share nodes, and there is no driveway expected to be 
mapped under it, is the layer=1 necessary? 

>> 
> Or try to get UltimaSnorlax to fix them?

Thankfully, they are not slathering my area in mangled polygons and 
non-existent tracks anymore - I asked them to clean up their work, but they 
never responded. 

they did map some named POIs that were a good addition, but almost every single 
way and polygon they drew has to be erased or heavily edited - and they were 
prolific for a year or so. Thankfully they stopped mapping a few months ago. 
They were all about mapping for z10, and by z13-15 it looked like a toddler’s 
crayon drawing. I’d rather clean up their mess than discover another 300 track 
ways through rice fields that don’t exist, or waterways mapped as highways; all 
of them half-sharing nodes with each other and every building and waterway that 
happen to be near the bird’s nest of ways he was creating.

Javbw
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