[OSM-dev] Proposal: Database accelerator and dirty tile marker based on simple algorithm.

[Nigel Magnay]

Ok - I suspect I'm not explaining myself terribly well and the threading
gets a bit lost on emails. I have set up the following page on the Wiki:

http://wiki.openstreetmap.org/index.php/QuadTiles

I have tried to explain why I think tile addressing is essential, and why it
ought to be a quadtree implementation and not a simple tile-addressing
scheme, and some details of how it might work in practice.

Whether the address is packed into a 32 or 64-bit integer isn't really that
important in comparison. I have a suspicion that it will actually be slower
than just using fixed char arrays, but - I don't know mysql that well, and
it's totally amenable to experimentation and metric gathering.

I'd like to see it in (an|the) API. I don't think it'd be that hard, but it
might make sense to resolve the current status of segments at the same time.
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