A Burger King building in my area has a couple of overhangs above the drive-through. I've tagged these parts building:part=roof, and the main building building:part=retail. These are included as 'part' members of the building relation.

I am unsure of how to map the 'outline' member of this relation. Should it overlap all of these building parts, or should it only overlap the building's building:part=retail (the footprint)?

asked 03 May, 01:42

Zismac's gravatar image

Zismac
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In general the convention in OSM is to map the bird's-eye view & not the footprint of the building. Most building will be mapped from aerial or satellite imagery so accurate mapping of footprints requires additional on-the-ground inspection. Mapping the building as visible from above generally ensures buildings are mapped consistently.

Note that this is different from the typical approach of national topographic maps.

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answered 03 May, 10:46

SK53's gravatar image

SK53 ♦
23.9k46240376
accept rate: 21%

Simple 3D Buildings, which is the tagging standard that the building:part=* key originates in, states that the building outline should overlap all the parts. That includes parts above the ground.

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answered 03 May, 11:42

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Tordanik
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accept rate: 33%

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question asked: 03 May, 01:42

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last updated: 03 May, 11:42

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