On Tue, 28 Apr 2009 13:34:16 -0000, "Nolan Darilek" <[email protected]> wrote: > I'm slowly hacking on a project that could benefit from an embedded > database, and I'm not smart enough to create my own binary format.
Have you looked at OsmBin in the wiki? There is a complete, custom binary format on the wiki and a well documented reference-implementation to test against. ;) > Furthermore, since we aren't usually under as severe constraints with > embedded resources these days, an actual embedded DB makes more sense. I > had a few questions regarding people's experiences, however. I tried a few and the performance it terrible for anything above 200-500MB. (a single state, not even a single country.) With OsmBin importing takes ages but then it's fast enough for interactive rendering of large areas. I'll try H2 again once they release a new version (The current one has a known bug that makes it unusable. For small maps it has shown quite some promise). > At the moment, I'm hacking on a prototype that uses Tokyo Cabinet's > table store, and geohashes to implement geospatial searches. Do you have any reference on "geohashes"? I did not encounter the term before. Do you mean one-way functions that turn a 2d-location into a 1d-index similar to a Z-curve or hilbert-curve? I'm still > working on refining the import process so haven't experimented with how > well searches work, and of course geohashes fail near the > equator/meridians, So? Add 180° and go above the north-pole. ;) No negative numbers anymore. > I've been reading references to MonetDB. I've googled, but its website > seems somewhat disorganized. I agree completely. It looks nice but you have a hard time finding a given piece of information (if it is present at all.). I needed to go to the small Sourceforge-link at the bottom just to see what language monetDB was implemented in. > How well does it work with Ruby? Again, either my GoogleFu is weak or > it's just not getting used much, because while it reveals the presence > of a Ruby library, I can't seem to find any "here's what's cool about > this and how to start using it" blog posts or articles. Same here for the Java-support in MonedDB. Marcus _______________________________________________ dev mailing list [email protected] http://lists.openstreetmap.org/listinfo/dev
