Thanks for that. I see now that it's linked from the article—I'd previously overlooked it as the article seemed to imply it was the product of their volunteer p

Thanks for that. I see now that it's linked from the article—I'd previously overlooked it as the article seemed to imply it was the product of their volunteer programme, but it seems it isn't: > The building information was developed with sensors from low altitude aerial imagery. > The building footprint and height information was captured and developed in 2013. There's also Atlas[0], not mentioned in the article, which seems to be a (open-source/non-free??[1]) tool released by Apple for use specifically with OSM data. Really interesting stuff. [0] https://github.com/osmlab/atlas https://github.com/osmlab/atlas [1] https://github.com/osmlab/atlas/blob/dev/LICENSE https://github.com/osmlab/atlas/blob/dev/LICENSE