[OSM-dev] [OSM-legal-talk] license change effect on un-tagged nodes

[marqqs at gmx.eu]

> > Can someone please explain the logic of not recording major changes in
> the
> > database such as shifting an entity?

That's not correct. There _are_ records for every way shifting in the database. They are simply not there where you would expect it. ;-)

However, it should not be too difficult to retrieve the information you need from the node records, as the node records are referred to by the way records.

Marqqs

-------- Original-Nachricht --------
> Datum: Wed, 6 Jul 2011 19:31:33 -0400
> Von: Anthony <osm at inbox.org>
> An: "Dave F." <davefox at madasafish.com>, Frederik Ramm <frederik at remote.org>, OSM-Dev Openstreetmap <dev at openstreetmap.org>
> Betreff: Re: [OSM-dev] [OSM-legal-talk] license change effect on un-tagged	nodes

> On Wed, Jul 6, 2011 at 7:14 PM, Dave F. <davefox at madasafish.com> wrote:
> > On 06/07/2011 21:04, Anthony wrote:
> >>
> >> On Wed, Jul 6, 2011 at 3:57 PM, Frederik Ramm<frederik at remote.org>
>  wrote:
> >>>
> >>> Dave F. wrote:
> >>>>
> >>>> If one of these gets moved then the whole way gets updated,
> >>>
> >>> No.
> >>
> >> Substantively, that is what happens, but technically, in the database,
> >> it is not.
> >>
> >> In the database, we go from:
> >>
> >> <way id=1><nd id=8><nd id=9><nd id=10></way>
> >> <node id=8 lat=82 lon=18 />
> >> <node id=9 lat=81 lon=18 />
> >> <node id=10 lat=81 lon=17 />
> >>
> >> to:
> >>
> >> <way id=1><nd id=8><nd id=9><nd id=10></way>
> >> <node id=8 lat=81 lon=17 />
> >> <node id=9 lat=80 lon=17 />
> >> <node id=10 lat=80 lon=16 />
> >>
> >> Of course, I think that obviously this:
> >> <node id=8 lat=81 lon=17 />
> >> <node id=9 lat=80 lon=17 />
> >> <node id=10 lat=80 lon=16 />
> >>
> >> is a derivative of this:
> >> <way id=1><nd id=8><nd id=9><nd id=10></way>
> >> <node id=8 lat=82 lon=18 />
> >> <node id=9 lat=81 lon=18 />
> >> <node id=10 lat=81 lon=17 />
> >>
> >> (assuming a way with, say, 1000 nodes rather than 3...where between 3
> >> and 1000 you can stop, well, that's a different question)
> >
> > Well, I learn something new every day.
> >
> > This explains a lot - as to why entities keep moving but there's no
> record
> > of it.
> >
> > Can someone please explain the logic of not recording major changes in
> the
> > database such as shifting an entity?
> 
> I suggest you ask that question on the dev list.
> 
> _______________________________________________
> dev mailing list
> dev at openstreetmap.org
> http://lists.openstreetmap.org/listinfo/dev