On Mon, Feb 19, 2018 at 10:59:31AM +0100, Maarten Deen wrote: > On 2018-02-19 10:17, Sarah Hoffmann wrote: > > On Sun, Feb 18, 2018 at 08:12:45PM +0100, Maarten Deen wrote: > > > On 2018-02-18 20:07, Paul Johnson wrote: > > > > On Sun, Feb 18, 2018 at 12:53 PM, Maarten Deen <md...@xs4all.nl> > > > > wrote: > > > > > > > > > On 2018-02-18 19:28, Tom Hughes wrote: > > > > > > > > I can't comment about how the algorithm works because I don't know > > > > > anything about it. I'm just saying that we do tell it the viewbox > > > > > > > > It appears to me that the bounding box is used when searching places > > > > (towns, cities) or streets, but not when searching objects like shops > > > > or restaurants. > > > > For instance, searching for a McDonald's always gives me the > > > > McDonald's at 1351, George Dieter Drive, El Paso City, El Paso County, > > > > Texas, 79936, Verenigde Staten van Amerika > > > > To fix that please delete all the wikipedia=McDonalds tags from > > the McDonalds restaurants that show up inappropriately. Nominatim uses > > the wikipedia links to determine how well known a place might be and > > ranks places with a wikipedia tag higher. > > I would expect that a bounding box has precedence over other tags. Why would > a wikipedia tag have precedence over the bounding box and a name tag not?
It is not a question of precedence. Nominatim looks at different factors at the same time: the view box, how well-known a place is (aka wikipedia importance), how well the name of the place matches your query etc. It takes all these into account weighs them against each other and comes to a ranking of results. > But then I still don't understand. > In the bugreport I have the example of the shop "kruidvat" (it is a chain of > stores in the Netherlands). > The bounding box is 6.16575,51.36926,6.17049,51.36759 which centers on the > Kruidvat store in Venlo [1]. Nominatim returns the kruidvat in Amsterdam > [2]. > Both nodes have a website tag with the same value. Both nodes have the same > tags, expect that one has a source tag. > Then still, why is the boundingbox not looked at _at all_? It's not like > it's the second or third result, it is the 12th result where all other > results have similar tags and the results are the same whatever bounding box > you use. Interesting. So in this case the importance actually happend to accidentally cancel out the viewbox influence. I've pushed a preliminary fix to the osm.org instance. It won't fix the McDonalds or Walmart issues though. They are problems of a different kind. Sarah _______________________________________________ talk mailing list talk@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk
