[OSM-newbies] Overkill or Not?

[Austin Martin]

Ok, that helps Richard.

Thanks everyone,
Austin Martin

On Sun, Oct 4, 2009 at 5:55 PM, Richard Weait <richard at weait.com> wrote:

> On Sun, Oct 4, 2009 at 3:20 PM, James Ewen <ve6srv at gmail.com> wrote:
> >
> > What about this?
> >
> >
> http://www.openstreetmap.org/?lat=53.4360945224762&lon=-113.488726615906&zoom=15
> [ ... ]
> > Some days you just want to take the traffic planners out and shoot them!
>
> Now, James, you have been involved with OSM long enough to know that
> the project does not advocate shooting traffic planners. ;-)
>
> And new mappers should note that established don't always have The
> Answer and will consult or revise.
>
> If someone had mapped that intersection as a simple divided-undivided
> it would be correct.  Adding the four flares would also be correct.
> We're building an abstraction of the real world, not a 1:1 exact
> replica; where would we put it?  And different mappers will disagree
> on exactly where my abstract model is too much or yours is not enough.
>
> In either case using turn restrictions makes the abstract junction
> more accurate to routing programs.  You appear to be using
> way-placement to imply turn restrictions.  I have done that before,
> but only where physical barriers exist, as in:
>
>
> http://www.openstreetmap.org/?mlat=43.638215&mlon=-79.45347&zoom=18&layers=B000FTF
>
> http://maps.google.ca/maps?hl=en&client=firefox-a&q=Craigavon+Dr,+Strathcona+County,+Division+No.+11,+Alberta&ie=UTF8&cd=1&geocode=FfngMAMdo7A_-Q&split=0&sll=49.891235,-97.15369&sspn=16.71875,56.536561&hq=&hnear=Craigavon+Dr,+Strathcona+County,+Division+No.+11,+Alberta&ll=43.638296,-79.45334&spn=0.002838,0.005466&t=h&z=18
>
> I'm not saying that you are wrong, just that my choice of abstraction
> allows me to be lazier for the Cragavon intersection.  ;-)
>
> And that I should use turn restrictions for interesting junctions.  ;-)
> http://wiki.openstreetmap.org/wiki/Relation:restriction
>
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