If anybody is interested I've put some sample full history changesets on the planet server to give people an idea of what is possible. http://planet.openstreetmap.org/history
This may not be the best way of providing full history, but it is something I could produce on a daily/hourly/minute schedule like the current delta changesets. The history files use an identical file format to the existing delta changesets, the only difference between the two osc formats being that with full history changesets it is possible for a single entity to appear multiple times (ie. one version per change in that time interval). Perhaps I should create full history files with a different extension to avoid confusion, perhaps *.osh? For downloading bulk history and avoiding downloading several hundred daily files, there are a couple of options: * Merge multiple fill history osc files into a single file. This can either be a straight concatenation, or can be re-sorted so that all versions of an entity are co-located. I might have to tweak the existing merge tasks in osmosis to do this. * Create a new tool that dumps into a full history osm format. It would differ from existing planet files by having multiple versions of each entity (rather than just the latest) and each would have the visible flag set. From my perspective I prefer the osc format because it allows easier merging and manipulation of changes and is supported by osmosis. But the great thing about this community is that we can make our own choices :-) Having said all that, I won't start the full history daily process running just yet. We need some more space on the planet server (which is already in planning), and it might be a good idea to let the existing 0.6 transition settle down for a week or two to avoid overloading admins with problems. It might take several days to process the full set of daily files and I'm not sure what kind of load it will place on the database server yet. Anyway, happy to discuss. And I'd like to hear if there are better alternatives or if people think this is a bad idea. Brett _______________________________________________ dev mailing list [email protected] http://lists.openstreetmap.org/listinfo/dev
