To make it more complex for the Philippines: - has 7,100 (more or less) islands - Administrative boundaries are country, region, province, municipality/city/town, barangay - some administrative jurisdiction are covered by a number of islands - some administrative jurisdiction are partially within an island
I'm not against dropping the is_in tags, it is useful for search indexing. But in the future if we can create/add a definitive administrative boundaries for each country, then it would just be duplication. cheers, maning On 4/10/08, Andy Allan <[EMAIL PROTECTED]> wrote: > On Thu, Apr 10, 2008 at 9:24 AM, Lester Caine <[EMAIL PROTECTED]> wrote: > > > Looking at the growing mess of wiki pages relating to > > place/is_in/boundary/relations and the rest I think that I would not be > > wasting my time now putting together a 'proposal' for good practice for > > handling the simple hierarchy of is_in but it does need a means of > identifying > > different 'Naga City' objects other than adding 'Camarines Sur, Luzon, > > Philippines' to every use of it :( > > is_in is a short-term kludge. It's almost completely unnecessary when > - and only when - we have boundaries for whatever the larger area is. > Sometimes it's useful* when you don't. > > The key fact that everyone forgets is that everything we deal with has > geographic coordinates. If you can give me a bounding polygon for a > country (whether derived from OSM or VMAP0 or wherever) then I can > tell you if a given amenity=pub is in that country. No need for any > relations or is_in tags AT ALL. > > If we weren't talking about map data, then yes, we'd need a hierarchy. > organisation=society,name=RNIB would need is_in=UK, for example, since > there can't be coordinates for something that doesn't have a physical > location. But we're not worried about that because we're talking about > OpenStreetMap. > > If you want a list of islands in the Philippines, it's really quite > straightforward. Give all the islands coastlines, define the boundary > of the country, and hey presto the rest is just a SELECT statement. If > you want to tag every island, ney every node in the database with what > regions they lie within (via is_in or relations) then you're wasting > your time. > > Cheers, > Andy > > * Not sure to who, to be honest, but maybe the namefinder uses it? > > _______________________________________________ > talk mailing list > talk@openstreetmap.org > http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/talk > -- |---------|----------------------------------------------------------| | __.-._ |"Ohhh. Great warrior. Wars not make one great." -Yoda | | '-._"7' |"Freedom is still the most radical idea of all" -N.Branden| | /'.-c |Linux registered user #402901, http://counter.li.org/ | | | /T |http://esambale.wikispaces.com| | _)_/LI |---------|----------------------------------------------------------| _______________________________________________ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/talk
