Re: [Talk-GB] Documenting tagging practice for place nodes in London

2020-06-24 Thread Russ Garrett
On Wed, 24 Jun 2020 at 09:19, Jez Nicholson  wrote:
> I take it that these names are used by Nominatim to assist with search. I 
> know it's another form of tagging-for-the-renderer, but do you know 
> how/whether changes affect it?

I'm not especially familiar with the internals of Nominatim but I
think for most purposes it actually prefers the page rank on Wikipedia
(discovered via the wikidata tag if provided) for ranking place nodes,
rather than the actual value of the place tag (which makes sense as
the usage tends to be inconsistent anyway).

https://nominatim.org/release-docs/develop/develop/Ranking

-- 
Russ Garrett
r...@garrett.co.uk

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Re: [Talk-GB] Documenting tagging practice for place nodes in London

2020-06-24 Thread Jez Nicholson
I take it that these names are used by Nominatim to assist with search. I
know it's another form of tagging-for-the-renderer, but do you know
how/whether changes affect it?

On Tue, Jun 23, 2020 at 10:31 PM Russ Garrett  wrote:

> Hi folks,
>
> By way of lockdown procrastination, I started looking at place nodes
> in London. The main things which were annoying me are:
>
> * The presence of a few archaic place names which were presumably
> derived from NPE or other historic maps but are generally out of use
> now.
> * A surprisingly large number of place names present in OS StreetView
> are unmapped on OSM.
> * Most places in London are tagged as place=suburb, regardless of
> their size/importance. This issue especially is annoying me quite a
> lot now I've started noticing it.
>
> I started demoting some place=suburbs to place=quarter, and promoting
> one or two of them to place=town (as this seems to be almost
> universally used as the next level up from suburb in London), when it
> was pointed out that it's probably worth discussing this.
>
> These place tags are quite subjective, especially because they
> frequently get used for reasons which don't really tie in with their
> name, and wiki is pretty vague about their definition, so I don't
> think we can avoid some level of tagging for the renderer here.
>
> I think it would be useful to document which of these tags we want to
> use in London, and ideally some kind of heuristic for where to use
> them.
>
> I've generated a list of all place nodes within Greater London and the
> City, by type:
> https://wiki.openstreetmap.org/wiki/User:Ru/London_Place_Nodes
>
> Cheers,
>
> --
> Russ Garrett
> r...@garrett.co.uk
>
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