[OSM-talk-be] Ways with identical coordinates on top of each other

[Florian Goetghebeur]

Hello,

I recently came across a parking building with multiple floors in OSM, in which ways are tagged with 'level' and 'layer' tags. It struck me that there are ways that have the very same geometry on different levels (see links below). As a result, the map has four arrows (one for each level), indicating the oneway direction, with only little space in between. It looks strange to me. But having nodes and ways stacked on top of each other might have other unwanted consequences, e.g. when you try to process the OSM data to get a road network for routing and you do not take the level and layer tags into account.

So I am now wondering about the community's vision about this 2D vs 3D issue. Can OSM still be seen as a 2D map? In what way is OSM evolving regarding this topic? We now have this strange blend between a 2D visualization and a few 3D tags that can cause issues. The notes and comments for the nodes below show that there have been problems already.

Thanks for sharing your insights!

Four nodes at the same location:
https://www.openstreetmap.org/node/4359171125
https://www.openstreetmap.org/node/4359171126
https://www.openstreetmap.org/node/4359171127
https://www.openstreetmap.org/node/4359171128
Two ways with the exact same coordinates:
https://www.openstreetmap.org/way/438182278
https://www.openstreetmap.org/way/438182283

Kind regards,
Florian
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