[OSM-talk] displayed width of roads

[80n]

It's definitely wrong to adjust the layer just to make the rendered output
look better.

The layer tag should represent the true relative position of roads.

Incidentally, if a ramp connects two roads at different levels then should
it be layer=0 at one end and layer=1 at the other, with the split  somewhere
in the middle?  I don't see how else you can correctly represent a ramp.

80n

On Feb 18, 2008 3:21 PM, Dermot McNally <dermotm at gmail.com> wrote:

> On 18/02/2008, Tom Hughes <tom at compton.nu> wrote:
>
> > If the slip roads are not really underneath the other roads then
> > yes it is definitely wrong (IMHO). The layer tag is meant to describe
> > the physical ordering of the roads on the ground.
> >
> > If something isn't rendering right the solution is to fix the
> > rendering not to deliberately misdescribe the data to try and
> > make the rendering look prettier.
>
> This was very much my own view too. However, there's the basis for an
> argument here. The deck of a bridge (layer=1) that spans a motorway is
> probably on the same "level" as the roadways connected to it (layer=0,
> usually implicit).
>
> The other mapper I was discussing this with is doing something that,
> IMO, isn't as drastic as tagging slip roads at layer=-1. He likes to
> tag the mainline of the motorway to layer=-1 for a buffer zone either
> side of a bridge that spans it. You _could_ argue that it's no worse
> than the bridge deck and its connections to the non-bridge roadways.
>
> But to me, this is all just unnecessary editing and rendering sugar
> doesn't belong in the data set. The ideal thing would be if the
> rendering quirks could be ironed out so that people wouldn't feel
> motivated to spend their time on workarounds. Does any rendering
> wizard agree? (because I wouldn't know where to start...)
>
> Dermot
>
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