On Sat, Nov 8, 2014 at 12:35 AM, Greg Morgan <[email protected]> wrote: > > > It is unfortunate that importers are dropping values like addr:city and > addr:state during US imports. Especially when they appear to have clean > data at the time of import. There are other users of the OSM data than > just Nominatim. I imagine that our data looks crappy to a person wanting > addresses without the concerns or abilities of GIS applications. > > To be clear, addr:city *IS* being used on imports and is useful information. Postal addresses for cities often extend far beyond the physical city boundaries and therefore can not be inferred by use of boundary relations. This is not the case with state and country which means the information in these tags is duplicated data.
4.) Though not confirmed by me, it feels like to me that European addr:city > values actually mean a city boundary. I am guessing Nominatim prefers > addr:city over is_in tags because of my perceived idea that European > addr:city values more closely match the actual jurisdiction geometric > area. What does addr:city in the US mean then? The jurisdiction of the > POI or the postal value for the POI? > Nominatim actually does not correctly use addr:city. You are correct in that it does assume a better match between physical border and postal city address. What happens is it actually puts city information on *roads* based on boundary relations and place=* nodes. Then it links individual address points to the roads. The addr:city tags on POIs and building outlines is actually completely ignored. This leads to things like this address not being found if you search for it in Manhattan, KS: https://www.openstreetmap.org/node/2209430502 On the other hand, this one on the next street over is found because I added an addr:city tag to the road: https://www.openstreetmap.org/node/2209427353 road: https://www.openstreetmap.org/way/13226787 I consider this to be a nominatim bug and haven't attempted to do a mass tagging of roads with addr:city because I see this as essentially tagging for the renderer. Toby
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