[OSM-talk] Parking aisle as boundary of car park not showing

[80n]

This is an interesting topic which is well worth discussion, but to return
to the original question for a moment.  The issue is that mapnik is not
capable of rendering a way that is both a path and an area.  The example
given was highway=service, amenity=parking.

Regardless of whether people are centerlineists or not, there are always
going to be mappers who will tag ways this way.  We have a free form tagging
scheme so we cannot prohibit such things.  For example, a way tagged as
highway=waterway, power=line (two linear tags) might be unusual (water and
electricity generally don't mix ;) but we cannot disallow it.

So, if a way is tagged as highway=service to describe a road, but also
amenity=parking to indicate that the road *"is part of the car park and
defines its boundaries"* then that's the way it is.

Suggesting that the data be changed to accommodate the deficiency of a
particular renderer is very much a case of mapping for the renderer.  This
is a principle that is important to uphold.  Fix the renderer not the data.

Back to the centerlineist discussion...

80n


On Thu, Sep 25, 2008 at 11:30 AM, Frederik Ramm <frederik at remote.org> wrote:

> Hi,
>
> On 25.09.2008, at 12:23, Ed Loach wrote:
> > I would agree, and if Frederik does want to tag roads as areas he
> > could use the width= and/or est_width= tags, although it is unlikely
> > that the renderers use them, assuming that the widths they currently
> > render are based on just the highway= value and doesn't take into
> > account any width tags (though I may be wrong).
>
> Well I don't necessarily want to tag roads as areas, I just want to
> map the fact that something (e.g. a forest) extends exactly up to the
> road. If the road is 0 metres wide (or "as wide as the renderer wants
> it to be"), then the only way to map this is to re-use the road
> centreline as a forest border. If the road had a left and right
> shoulder line then I could use that to delineate the forest border.
>
> It all boils down to whether the forest border and the road are
> independent of each other or whether you simply wanted to express
> "the forest stops at the road" (which is often the case for landuse
> or administrative areas, less often for forests).
>
> Bye
> Frederik
>
> --
> Frederik Ramm  ##  eMail frederik at remote.org  ##  N49°00'09" E008°23'33"
>
>
>
>
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