[OSM-dev] Autocorrectable data inconsistency

Gregory Williams gregory.williams at purplegeodesoftware.co.uk
Tue Aug 19 11:49:44 BST 2008


In which case, my apologies for misinterpreting, and I completely agree that duplicated nodes serve no purpose whatsoever.

Gregory

> -----Original Message-----
> From: Jochen Topf [mailto:jochen at remote.org]
> Sent: 19 August 2008 09:59
> To: Gregory Williams
> Cc: dev at openstreetmap.org
> Subject: Re: [OSM-dev] Autocorrectable data inconsistency
> 
> You have misinterpreted the topic. Its about having the exact same node
> several times one after each other in a way.
> 
> Jochen
> 
> On Tue, Aug 19, 2008 at 08:55:06AM +0100, Gregory Williams wrote:
> > I've only seen this thread partway through, so please tell me if I've
> completely misinterpreted the topic.
> >
> > As I see it there is a case, at least on a practical level, for
> storing a series of nodes along a straight line in a way. Imagine a
> very long straight road that crosses multiple z12 tiles. If this were
> stored in its simplest geometric form then there wouldn't be nodes
> within (or potentially in the extra margin that t at h downloads) a z12
> tile. Therefore the tile would be rendered as if that road doesn't
> exist.
> >
> > Similarly if somebody working in an editor doesn't download a
> sufficiently large area to encompass at least one of the way's nodes
> then they may get the impression that the road hasn't yet been entered
> into OSM's data. That might even lead to them drawing their own road
> along the same path!
> >
> > Gregory
> >
> > > -----Original Message-----
> > > From: dev-bounces at openstreetmap.org [mailto:dev-
> > > bounces at openstreetmap.org] On Behalf Of Jochen Topf
> > > Sent: 19 August 2008 08:24
> > > To: Joachim Zobel
> > > Cc: dev at openstreetmap.org
> > > Subject: Re: [OSM-dev] Autocorrectable data inconsistency
> > >
> > > On Mon, Aug 18, 2008 at 11:17:53PM +0200, Joachim Zobel wrote:
> > > > Am Montag, den 18.08.2008, 13:30 +0200 schrieb "Marc Schütz":
> > > > > Is there actually a valid use case for having the same node
> > > multiple
> > > > > times in a row?
> > > >
> > > > I don't see any.
> > > >
> > > > I could write a script to korrect the existing ones. Do the
> > > sequence_ids
> > > > have to be in sequence (which means the ones above need to be
> shifted
> > > > down) or does a simple DELETE per dupe do it.
> > >
> > > All changes should be done through the API. Do changes on the
> database
> > > directly only leads to inconsistencies. The API does not expose the
> > > sequence number, so the order alone is fine.
> > >
> > > Jochen
> > > --
> > > Jochen Topf  jochen at remote.org  http://www.remote.org/jochen/  +49-
> 721-
> > > 388298
> > >
> > >
> > > _______________________________________________
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> > > dev at openstreetmap.org
> > > http://lists.openstreetmap.org/listinfo/dev
> >
> >
> > _______________________________________________
> > dev mailing list
> > dev at openstreetmap.org
> > http://lists.openstreetmap.org/listinfo/dev
> >
> 
> --
> Jochen Topf  jochen at remote.org  http://www.remote.org/jochen/  +49-721-
> 388298
> 





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