[Talk-us] ref tags

Jason Remillard remillard.jason at gmail.com
Mon Jun 17 21:15:12 UTC 2013


Why not just patch osm2pgsql? It seems like the right place for this
is on the relation.

On Mon, Jun 17, 2013 at 4:03 PM, Martijn van Exel <m at rtijn.org> wrote:
> Hi all,
>
> I wanted to get an opinion on the right place for 'ref' tags on numbered
> routes.
>
> From what I understand, osm2pgsql and the downstream rendering process uses
> the ref tags on the way object to render highway 'shields'.
>
> The following example corroborates this. Consider this (long) way:
>
> http://www.openstreetmap.org/browse/way/13649057
>
> See how this segment has no 'shields' on the map because the way itself has
> no ref tag:
>
> http://www.openstreetmap.org/?lat=32.5419&lon=-89.4744&zoom=13&layers=M
>
> Even though the way is part of the properly tagged relation
>
> http://www.openstreetmap.org/browse/relation/23246
>
> I see two issues here:
>
> 1) Information already present in the relation object being duplicated on
> the way to satisfy the renderer
> 2) Incomplete coverage of ref information on ways
>
> I don't think we can solve 1) in the short term. There are likely many, many
> numbered route networks in the world that are poorly covered by relations,
> because the renderer does not encourage it, because relations were
> introduced after a lot of numbered routes were already tagged before the
> arrival of relations, because the wiki is ambiguous, perhaps other reasons.
>
> There are perhaps a few thousand ways in the U.S. that are part of a
> numbered route, yet do not have ref tags on the way. My question is: how
> should we deal with these?
>
> My proposal is to 'fill the gaps' by manually tagging these ways using the
> existing conventions for route relation ref tagging ('US 98', 'I 20', 'MS
> 467', etc.) wherever this information can be derived from an existing route
> relation. We have folks here at Telenav willing to spend some cycles on
> this, but I want to see if this is a sane approach before we do anything.
> --
> Martijn van Exel
> http://oegeo.wordpress.com/
> http://openstreetmap.us/
>
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>



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