Andy Allan wrote: > On Wed, Jul 9, 2008 at 4:43 PM, Martijn van Oosterhout > <[EMAIL PROTECTED]> wrote: > >> Usage is simple enough. first load your planet dump with --slim mode >> (if you have the memory, give it a big cache): >> osm2pgsql --slim my-planet-extract.osm.gz >> After that you can use: >> osm2pgsql --slim -a my-daily-diff.osc.gz >> To apply the patch. >> Don't forget the -a, or you'll blow away the database you've got. >> Very nice! Thanks Martijn, I've been looking forward to this for a long time. I look forward to giving this a go. > Is chaining multiple diffs supported? E.g. > > osm2pgsql --slim planet.osm.gz > osm2pgsql --slim -a thursday.osc.gz > osm2pgsql --slim -a friday.osc.gz > This would work quite nicely with the Osmosis --read-change-interval task: http://wiki.openstreetmap.org/index.php/Osmosis#--read-change-interval_.28--rci.29
The purpose of that task is to retrieve all change files since the last time it was run (it maintains configuration timestamp state in local files), merges all the changes into a single change stream, and writes them to the output. It should be possible to run the whole thing something like this: osmosis --read-change-interval workingDirectory=<my osmosis working directory> --write-xml-change /dev/stdout | osm2pgsql --slim -a /dev/stdin The --read-change-interval can be used with daily, hourly or minute changesets by changing the configuration file appropriately. You need to run the --read-change-interval-init task first: http://wiki.openstreetmap.org/index.php/Osmosis#--read-change-interval-init_.28--rcii.29 Then modify the configuration file it creates. This can be run as often as you like because it will produce an empty changeset if no data is available. In theory it should be possible now to keep a mapnik database within 6 minutes or so of the main API although mod_tile might require some serious tweaking to deal with this. Running hourly should work quite nicely however for a small site. _______________________________________________ dev mailing list [email protected] http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/dev
