On Mon, Nov 3, 2008 at 3:02 PM, Andy Allan <[EMAIL PROTECTED]> wrote:
> On Mon, Nov 3, 2008 at 2:28 PM, David Ebling <[EMAIL PROTECTED]> > wrote: > > > On a complete tangent to this conversation... I was curious about the > area > > Richard mentioned, so looked it up: > > > http://www.openstreetmap.org/?lat=52.98283&lon=-1.99189&zoom=15&layers=B000FTF > > > > And was amazed that someone has obviously put a lot of work into this, > and > > yet it bears very little geometric similarity to this (for comparison > > only!): > > > http://www.multimap.com/maps/?qs=cheadle&countryCode=GB#map=52.98372,-2.00288|15|4&bd=useful_information&loc=GB:52.98896:-1.98721:14|cheadle|Cheadle,%20Stoke-on-Trent,%20Staffordshire,%20England,%20ST10%201<http://www.multimap.com/maps/?qs=cheadle&countryCode=GB#map=52.98372,-2.00288%7C15%7C4&bd=useful_information&loc=GB:52.98896:-1.98721:14%7Ccheadle%7CCheadle,%20Stoke-on-Trent,%20Staffordshire,%20England,%20ST10%201> > > > > I know which I am inclined to believe... > > This is brilliant. It's a lot more extensive than the bit that you > linked to though - for those of you who are registered for ITOWorlds' > OSM mapper product, clicky the linky: > > http://www.itoworld.com/product/osm/map?area=310:16&show=users&sort=total- > > (sign in *first* :-) ). You can see that it's so extensive it's even > off the top of this area. > > > I wonder how easy it will be to improve the accuracy of data such as > this, > > where the topology and road naming is probably mainly correct (I imagine > > they sketched maps as they went) but the geometry is way off. When I get > a > > moment I'll have to look and see whether any GPS traces already in the > > system can be used to improve this area. Maybe we could even make a > > significant improvement with Landsat images? > > I've spent 5 minutes looking at it compared to NPE - it actually seems > quite reasonable topology, and looks very similar to when I've done > TIGER fixups. I'd be hesitant about using NPE for positioning, but > given how really, really inaccurate this is it might be a good start. > Since street names are one of the harder bits of information to collect, what this user has done here looks like a very worthwhile contribution to the project. Perhaps we should even be encouraging users without GPS units to create this kind of topological map. It looks reasonably usable and is very consistent with the wiki philosophy of incremental improvement. There are a lot more people without GPS units than there are with, and if they can get pleasure from recording street names like this, then the GPS mappers job is made much easier. 80n > > Cheers, > Andy > > _______________________________________________ > talk mailing list > talk@openstreetmap.org > http://lists.openstreetmap.org/listinfo/talk >
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