[Tagging] Race track
osm at inbox.org
Sun Jan 31 16:24:51 GMT 2010
On Sun, Jan 31, 2010 at 11:15 AM, John Smith <deltafoxtrot256 at gmail.com>wrote:
> On 1 February 2010 02:10, Anthony <osm at inbox.org> wrote:
> > Maybe your implementation of micro mapping lanes doesn't have anything to
> > with areas, but then, if so it probably doesn't work. How do you
> > gore areas which have highly variable widths as anything but areas? If
> > you've got a solution for it I'm all ears.
> Think railway tracks...
I think railway tracks have constant widths. Otherwise the trains would
have a lot of problems.
> Why do you need to represent road way area so accurately to show the
> lane to be in to exit as depicted, I highly doubt that depiction used
> area information to display the lanes etc, it would have been
I don't understand the question.
> Areas are also by far the easiest way to indicate both widths and
> > connectivity. In order to map
> Areas are of limited value besides showing where the road base
> occupies, and even then it won't be 100% accurate since we're not
> doing raster mapping.
Why is raster mapping more accurate? I thought the point of vector graphics
was that they were *more* accurate. Nothing is going to be 100% accurate,
Limited value besides... Fine, at least you agree it is of some value.
> As for connectivity, highly doubtful, you can't indicate valid
> direction that traffic can go.
You can if you designate one way as left and one way as right. I do not
mean for "area" to imply "single closed way".
> > you need to represent the two lanes on the right and the three on the
> > 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).
> Again, think railway tracks... how do railway tracks merge and split?
Not like roadways. Trains can only drive along tracks. Those tracks are a
fixed distance apart. It's nothing like a highway.
> 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.
> Or using some kind of cascade method from ways so you can use the
> existing way tags to flow down into lanes...
I'll stick with the specific solution I've already worked out, rather than
"some kind of cascade method".
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