[OSM-talk-be] [Tagging] agglomération

[Sander Deryckere]

Working with relations is very hard for new mappers. Just setting a tag is
a lot easier.

It's also harder for the tools. You can't just map the keys from the
relations to the members, as it would mean that some ways should get two
contradicting tags like "natural=wood" and "natural=water". I also like
relations, but you can't force tools to use a different way of tagging for
Belgium if the same feature appears on many countries in the world.

It's just easier to handle if every way has a maxspeed=* tag.

Now, as for the mapping of aglomerations itself (if you're not interested
in the maxspeed, but only rendering the map), the agglomeration indeed
isn't really an area (it only gets bounded on streets, there is no border
between the streets). I think it would be easiest to just add some special
extra tag to the ways. A value like Ben proposed, or a new key. Although, I
doubt how useful this is and how much community support you will get for
tagging features as these.

Regards,
Sander


2012/11/21 A.Pirard.Papou <A.Pirard.Papou at gmail.com>

>  On 2012-11-21 21:26, Ben Laenen wrote :
>
> On Wednesday 21 November 2012 20:52:50 sly (sylvain letuffe) wrote:
>
>  That's the current state of recommendation, but maybe we could start
> discussing it to see if that's a good idea to apply speed limits on roads
> inside a bounding polygon
>
>  Polygons are a bad idea to map built-up areas. It's not uncommon that there's
> a bridge where the road on top belongs to the built-up area, but the road
> below does not. Or tunnels going under a built-up area, with the tunnel itself
> not part of it.
>
> Ben
>
>  I didn't speak of a polygon (closed ways) but of a relation (a set of
> ways).
> A speed limit on the roads doesn't prevent you driving as fast as you want
> in the meadows ;-)
> Look at multilinestring, which I see as a swiss-knife way assembly.
>
> In my mind, such a relation is the way to assign the same tags to a
> collection of objects making a whole with regard to those tags.  If we add
> recursion (nesting), which is very easy to do, that's powerful.
>
> Cheers,
>
>   André.
>
>
>
>
>
>
>
>
>
>
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