[OSM-talk] tagging and rendering highways in the USAandelsewhere
Dan Putler
dan.putler at sauder.ubc.ca
Fri Apr 18 17:55:22 BST 2008
On a "ground truth" note, it turns out that state "highways" in
California do range from freeways (CA 85), to major urban surface roads
(CA 82) to narrow two-lane rural roads (CA 130). While "lowly", some of
them really are secondary roads.
Dan
On Fri, 2008-04-18 at 17:33 +0100, Tom Hughes wrote:
> In message <005401c8a16f$7ac34b00$0200a8c0 at peter>
> Peter Miller <peter.miller at itoworld.com> wrote:
>
> > The state roads are currently tagged on OSM variously with trunk (green)
> > primary (red) and secondary (orange). Some pretty major roads a tagged with
> > secondary (actually a very lowly road class in the UK below motorway, trunk
> > and primary) and I suspect that this is because it renders with the correct
> > colour. There is no 'secondary_link' tag for exit and entrance ramps because
> > secondary roads are too minor to have such things so highways rendered as
> > secondary are using 'secondary' tags for exist and entrance ramps as well.
>
> There is no such thing as a tag that does not exist in OSM as we have
> freeform tagging. In addition to which mapnik at least does render
> things marked as secondary_link, so it seems to do a pretty good
> impression of something that exists to me.
>
> > If we can agree on the rendering rules and get both Mapnik and osmarender
> > sorted out for the USA then people will be incentivised to tag
> > appropriately. The moto 'render and they will come' probably applies here as
> > elsewhere.
>
> Agreeing on the rules or colour schemes is not the problem.
>
> The problem is that we do not have the technology to render different
> countries in different ways. I don't believe we even know of an efficient
> way to do it, so we don't even know what the technology would look like
> should somebody want to write it.
>
> See the ongoing discussion about the difficulty of the problem of
> determining efficiently what country something lies in for what I'm
> talking about.
>
> Tom
>
--
Dan Putler
Sauder School of Business
University of British Columbia
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