On Fri, Sep 2, 2011 at 10:40 AM, Ian Sergeant <inas66+...@gmail.com> wrote:
Since you asked: > One way streets? Yep. A one-way street mapped as a two-way street is better than nothing. > Roads with barriers at the end of them? It's highly unlikely that a truly impassable (by bike) street would be incorrectly mapped from aerial imagery. By contrast, I've fixed, from imagery, impassable roads that had previously been traced from out of copyright maps. > Roads with no > entry signs? I'm happy to take my chances. > Cross country roads that are private and gated? They make great stories. > Through roads > mapped as service roads, and v.v? Not sure why that would be a problem. > The amount of incorrect names, roads, etc in other maps sources verges on > the absurd. In my local area I could point to tens of examples of streets > on other maps sources with the wrong names. Me too. I could also point to thousands of examples of streets with the right name. > I'd like to think the survey > and consequent accuracy is an integral part of OSM. To me, accuracy is an aspirational goal, ranking somewhat lower than completeness. > This tracing vs survey argument is as old as OSM is. My vision of OSM is to > get take a different route on the bike, or see more of a town when you are > passing through, or even go for a walk around streets in your local area, So your motivation for working on OSM is to get out and about? That's great. > rather than being a mechanical turk in front of a computer screen, but each > to their own. Indeed. Criticising the contribution that myself and other aerial tracers make for its inherent limitations is not really "to each their own", though... > Sometimes there is no alternative to tracing, but I think > tracing without actually ever having placed a foot on the ground in the > area, leads to a significantly poorer quality map, and you don't need to > delve to far into the database for evidence of that.. Poorer than what? You need to be explicit about the comparison you're making. This is volunteer labour, and you can't meaningfully compare the contribution that people are willing to make against the contribution you'd prefer they make. And if you want to, you have to factor in time and other costs. I can trace 10 streets in the time you can survey one. We could argue about which is the more valuable contribution - or we could recognise that both are valuable, and get back to it. Steve _______________________________________________ Talk-au mailing list Talk-au@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-au
