Ok, that helps Richard. Thanks everyone, Austin Martin
On Sun, Oct 4, 2009 at 5:55 PM, Richard Weait <[email protected]> wrote: > On Sun, Oct 4, 2009 at 3:20 PM, James Ewen <[email protected]> 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 > > _______________________________________________ > newbies mailing list > [email protected] > http://lists.openstreetmap.org/listinfo/newbies >
_______________________________________________ newbies mailing list [email protected] http://lists.openstreetmap.org/listinfo/newbies
