On Wed, Nov 11, 2009 at 6:41 AM, Lars Francke <[email protected]> wrote: > There are a few questions that probably need answering first and I > hope we can start a discussion about this: > - Am I correct in assuming that there are no general objections from > the OSM server folks against such a dump? (Which would render the rest > of this E-Mail useless ;-)
the response has always been "if someone writes it, and it's good, we'll run it" :-) > - Is anyone else currently working on this? for some values of "working", yes. it's on my list of things to do for the license change plan - clearly we'll need a full data dump before we can re-license. > - Which format should the data be dumped in (3) is the easiest to get done and most easily supported, in my opinion. > - Distribution of the data and storage space requirements i have a feeling that the data, while big, won't be so big that the usual method of planet.osm.org + heanet mirror won't work. > - Interval of dumps based on back-of-the envelope calculations, a full dump in planet format would take something like 7-10 days to do in parallel with normal server activity. so it couldn't be run every week and would probably be cumbersome to do every month. in my opinion, we should be looking at every 3-6 months. > 3) A dump of all OSM elements in OSM format > (http://www.openstreetmap.org/api/0.6/node/60078445/history) this is my favourite method as well. the easiest approach would be to modify planet.c to dump the full history, instead of just the current_* tables. note that brett has been working on option (2) by using osmosis to dump very historical diffs going back to the inception of the database. you can see the experimental results in http://planet.openstreetmap.org/history/ for my money, if we do both (2) and (3), then we cater for all consumers, and in a standard format. the output of the COPY command, while good for backups, isn't really suited to dumping the information that we have in the planet (given there will be edits by users who are still not public, etc...) if you want to get started hacking on planet.c then i'm happy to help. otherwise i'm hoping to get around to it by the end of the month, but there are never any guarantees ;-) cheers, matt _______________________________________________ dev mailing list [email protected] http://lists.openstreetmap.org/listinfo/dev
