[OSM-dev] Data source for robot

[Jochen Topf]

On Tue, Oct 12, 2010 at 12:12:44PM +0200, Matthias Julius wrote:
> On Tue, 12 Oct 2010 10:48:29 +0200, Jochen Topf <jochen at remote.org> wrote:
> > On Tue, Oct 12, 2010 at 04:36:34AM -0400, Peter Budny wrote:
> >> They /are/ required, because roads may be discontiguous in various
> ways:
> >> a road may change names (e.g. Main Street North becomes Main Street
> >> South, but to a driver or pedestrian, both are just one continuous Main
> >> Street), or even be physically discontiguous (some state and even US
> >> Highways do this).
> > 
> > So?
> > 
> > Is any application actually using this? And what for?
> > 
> > I am not beeing facetious, what are these routes actually useful for
> that
> > the tags on the roads don't already do?
> 
> It avoids duplication of data.  You can either have the same tag on 200
> road segments or on one relation.

That might in theory be an argument, but in practice its more duplication,
because all applications I know of don't use those relations but the tags
on the ways.

Jochen
-- 
Jochen Topf  jochen at remote.org  http://www.remote.org/jochen/  +49-721-388298