Christopher Schmidt wrote: > On Sat, Dec 22, 2007 at 11:10:03AM -0500, Milenko wrote: > >> Pardon my ignorance, but what is the purpose of this database of blank >> tiles? I'm just curious, as I know little to nothing about what the [EMAIL >> PROTECTED] >> server does and how it does it. Is there a wiki page anywhere that >> explains how the infrastructure works? >> > > Rather than storing millions of 300 byte blank images, any time a blank > image is encountered, it stores a row in a table saying 'this tile is > blank (sea|land)'. At request time, if no tiles exist on disk, the tile > is looked up in the database, and if the tile in the database is there, > an appropriately colored blank image is returned instead. > May be something like this: Instead of keeping this information in database ,make a "bitmap" file of all tiles ,one byte for tile. Treat the file like two dimensional array , so lookup will be very fast. Of course a semaphore is needed to ensure data integrity. For zoom level 17 file will be about 17 Gb . For other zoom levels files will be smaller.
Regards Maciek Kaliszewski ---------------------------------------------------------------------- Szukasz kucharskiej inspiracji na swieta? Wejdz na >>> http://link.interia.pl/f1cbb _______________________________________________ Tilesathome mailing list [email protected] http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/tilesathome
