On Mon, Nov 12, 2012 at 2:21 PM, sly (sylvain letuffe) <li...@letuffe.org>wrote:
> On lundi 12 novembre 2012, ciprian niculescu wrote: > > Hello, > > Hi, > Hi, > > > I'm wondering why it don't exist the possibility to have minutely updates > > (or hourly) for a country? > > Short answer : because no one bothered to provide that for all countries. > :) uuu not good > > Medium size answer : It does exists for some areas as christian pointed to. > And a process exists to generate those, still, what is missing is someone > to > run it on a (several) server(s) and provide minutely diffs extracts. > nice, and the procedure is? :) > > Longer answer : The motivation might be low to provide such a service, low > to > keep pushing forward that way of doing because it isn't really flexible > (You > might need country X, but someone else will need country Y and some other > i see, so it don't scale up, it works if you want a particular area > will need an arbitrary area) while there are other ways to achieve the same > result, for example using > http://wiki.openstreetmap.org/wiki/Overpass_API/Augmented_Diffs > to split diffs at consumer side. > Tought, there isn't (AFAIK) tools to handle that now. > i've fast read the page and look good, i'll read all the parts, and put my questions after. > > I don't know what implies to make it. As far as i understand OSM to > > host/distribute hourly diff for country, it's something like: > > - do a minutely/hourly updates for the planet => result the planet.osm > > - do a split of the planet.osm on the polygons of the country > > - do a diff between the old-osm-contry and the new one => results the > > hourlly diff for the country > > > > Is this process wright? > That's one possible workflow for such a process (working directly on > planet.osm files however won't go anywhere due to time needed to process > the > planet file IMHO, but storing it into some more indexed format, why not) > yes and/or doing some pre-filtering of things that are not needed/intended for the end use. Let me explain: For editing the OSM map, doing it directly in the main DB is ok, beacouse the rendering of main slippy map is updated in minutes, but what if i update others data (in my case the public transport), i want to see the changes fast, not after 24h. For one zone i see the way, but i wanted to do it as global as possible as maybe others need this type of service. > > The other workflow would be to rely on special diffs (like Augmented_Diffs) > and split those diffs according to your needs. > The generation of planet Augmented Diffs beeing dedicated to some servers > while consumers splits at client side. > > > > -- > sly > qui suis-je : http://sly.letuffe.org > email perso : sylvain chez letuffe un point org > > _______________________________________________ > talk mailing list > talk@openstreetmap.org > http://lists.openstreetmap.org/listinfo/talk >
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