[OSM-talk-be] some thoughts and remarks about border mapping

[Ben Laenen]

On Tuesday 23 September 2008, Lennard wrote:
> The Dutch border system as it is now is comprised of overlapping ways
> using shared nodes.

ugly :-)

but I remember seeing a relation on the country border, so how's that 
used?

> The municipal border is a closed way, the 
> province border is another closed way, and it shares the nodes with
> various municipal boundaries. And on a higher level, the national
> border is another closed way that shares the nodes with the
> respective provinces and municipalities along the border.

How do they do it in Baarle-Hertog/Nassau?

> > In a truly happy world the boundary ways don't need admin_level and
> > should be extracted from its relations.
>
> Exactly, but is that already supported by the renderers at the
> moment? I'd be very interested to know this, because I'm also in the
> process of adding bits of municipal borders here and there, and would
> like to use relations.

Short answer: no, I think you need all rendering rules yourself. 
However, it should be quite easy.

Just need to go to the whole proposal phase once...

> > Of course, all these relations have its drawbacks: Potlatch
> > especially becomes awfully slow if there are a lot of relations in
> > view
>
> Don't let an editor stand in the way of smart tagging.

I know, and have never let it stand in my way :-)

btw, the relation way may need one extra thing: a "left" or "right" role 
for the members telling on which side the entity is. I think it's 
needed for solving ambiguity, especially with ex- and enclaves.

Ben