On Jan 10, 2008 9:11 AM, Robin Paulson <[EMAIL PROTECTED]> wrote: > On 10/01/2008, Michael Collinson <[EMAIL PROTECTED]> wrote: > > >which seems counter-intuitive, not to mention requiring huge amounts > > >of work. do we set this for every item - roads, churches, > > >supermarkets,....thousands of other items? > > >is there anything underway to enable OSM to calculate where an object > > >is, based upon knowledge of administrative boundaries - after all, > > >they are only a polygon-shaped bounding box? > > > > Yes, sort of. But the other way around, I am working on deriving > > administrative boundaries from "is_in" and "place" tags. *If* it > > works, the answer to your main question would be to randomly use > > is_in tags on low level items such as roads and churches and let the > > computer work out a boundary around them. I should be able to report > > back in February. > > sorry mike, i'm sure you've put a lot of work in, but that sounds even > more backwards, and very difficult to control well - i foresee a lot > of fudging to make it work in a lot of areas. > > the boundary data should be relatively easy to come by, and require a > *lot* less points to be drawn/edited, than your method. plus, your > method is never going to be one hundred percent perfect. for example, > what happens in areas of open country side, with no POIs to mark, when > the boundary changes direction - something that will happen a lot? > and what when a place is in two administrative boundaries? there are > fairly major cities that straddle for instance state lines in the US. > i think arkansas may be one? > > but i guess itches should be scratched....something will doubtless > come from this, whether unintended or not. ok, it'll be interesting to > see your results >
Having multiple ways of achieving the same (or similar) results is not a bad thing. Each will have it's own strengths an weaknesses. 80n > > _______________________________________________ > talk mailing list > talk@openstreetmap.org > http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/talk >
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