On Dec 23, 2007 7:21 PM, D Tucny <[EMAIL PROTECTED]> wrote: > On 23/12/2007, Martijn van Oosterhout <[EMAIL PROTECTED]> wrote: > > The whole point of the exercise is to not store all those. Doesn't > > really matter how, just need to find a way. > > With 18 zoom levels (0-17) and a single layer, we get a total of approx 23 > billion tiles... If all we are going to store all of them as land or sea, > the most efficient (storage wise, not speed wise and ignoring compression) > way we could store them would be a single set of sequential bits, that would > come out as about 2.7GiB...
You need at least three states, (LAND/SEA/TILE) so I'd suggest you look at the code supporting the oceantiles_12.dat file which does exactly this. Not everybody likes it though. An SQL table has the huge advantage of being easily accessable with standard tools... Have a nice day, -- Martijn van Oosterhout <[EMAIL PROTECTED]> http://svana.org/kleptog/ _______________________________________________ Tilesathome mailing list [email protected] http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/tilesathome
