True, they admit the 3D aspect cannot be handled at the moment. They tend to emphasise the opposite: one building with a single address, but multiple entrances; they can each have an individual w3w.
On 2015-11-23 10:43, Martin Koppenhoefer wrote: > 2015-11-22 15:32 GMT+01:00 Colin Smale <colin.sm...@xs4all.nl>: > >> You argument about being able to derive the w3w from the geometry is valid, >> but requires the use of the proprietary API. But as you mention their >> resolution is 3m, and I have seen discussions where people point out that >> their house falls into multiple squares so there is not a single translation >> from a building to w3w. ... > >> By the way, just to be absolutely clear, I am not thinking of w3w as a >> coordinate system in OSM, but as an addressing attribute similar to >> postcodes. > > it clearly is a coordinate system and not an addressing system. Addresses > adopt to the requirements, this system doesn't. Addresses are unique (at > least in the areas I know), this system can't guarantee it. If there are 2 > doors side to side falling into the same grid square 3x3, they will get the > same "address" (coordinates) in w3w, despite having actually distinct > addresses (this is how addressing works in Italy, one address for every > entrace). > > cheers, > Martin
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