[Tagging] Race track

Anthony osm at inbox.org
Sun Jan 31 16:10:25 GMT 2010

On Sun, Jan 31, 2010 at 10:59 AM, John Smith <deltafoxtrot256 at gmail.com>wrote:

> On 1 February 2010 01:51, Anthony <osm at inbox.org> wrote:
> > Among other things, I want to be able to produce
> >
> http://mytechnews.info/b/wp-content/uploads/2009/02/nuvi-lane-assistance.jpg
> >
> > That's not photorealism, and it's not raster data, but that gore area is
> > best mapped as an area (the lanes could be linear, but that would require
> a
> > bit more OSM redesign).
> Why is it best mapped as an area?

Because it has a variable width.

> It's a bunch of lanes and comes back to micro mapping lanes, which has
> nothing to do with areas...

Maybe your implementation of micro mapping lanes doesn't have anything to do
with areas, but then, if so it probably doesn't work.  How do you represent
gore areas which have highly variable widths as anything but areas?  If
you've got a solution for it I'm all ears.

Areas are also by far the easiest way to indicate both widths and
connectivity.  In order to map
need to represent the two lanes on the right and the three on the left
as separate ways.  But you also need to show that it is possible to route
between them (although with extra caution - i.e. a solid white line).
 Whether you want to call it a relation or an area I suppose is debatable,
but if you want to avoid a lot of complicated work you have to map the
*sides* of the (sets of) lanes, not the *middle* of them.

On Sun, Jan 31, 2010 at 11:01 AM, Richard Welty <rwelty at averillpark.net>wrote:

> in the case of the race track example, using a way as a centerline and
> including
> width= tags should encompass what's needed.

It works as long as everything is nice and neat, and has a constant width,
and has equal sized lanes, etc.  It fails as soon as you start to try
mapping the real world.
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