On Tue, May 13, 2008 at 12:57 AM, Andy Robinson (blackadder-lists) <[EMAIL PROTECTED]> wrote:
> Some of us map out an area completely in one go rather than doing it > piecemeal. Even if I come across some existing roads in a new area I ignore > them and do a new survey so that the whole area makes logical sence to me. > That way I can work out where the landuse areas are behind the houses and > the extent of school areas etc etc. So for me a reasonable level of > completeness is easy to decide and annotate. That's how I work too. So when I mark the area that's complete on the new system, I'll mark everywhere that I did as complete. That's a no-brainer. But let's scale this further, since what you, me and David have done, while interesting, is still a small amount of what's there. I would guess that only a proportion of the mappers will use this system, let's say a similar proportion to those who map in landuse=residential. But the key is that not everyone will use it. So how do we scale the efforts of this subset of people who *do* want to use the completeness system to provide measurements of the rest of the data? How do you, me and David (say) work out which areas of Glasgow and St. Louis are complete? Maybe we can look at the road density and guess. But that could be automated. My original point was that we can look at areas that we don't know particularly well and it's much easier to spot the problems than confirm which bits are done. With the proposed system, it'll take me 15 minutes to mark everywhere I thoroughly mapped, and then I want to do something useful. So I can mark 20-something square kilometres of London as complete (to the "95th percentile of completeness"), and *much more* as definitely incomplete (i.e. Dave's renderings of unnamed roads) and much of it 'unassessed' where it could be anything from the 60th to 95th percentile. Anyway, that's just my take on it. Cheers, Andy _______________________________________________ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/talk
