On Thu, Aug 21, 2008 at 1:42 AM, Frederik Ramm <[EMAIL PROTECTED]> wrote: > Hi, > >> I think that adding the Lat/Lon tag to node references in the ways is not an >> option since it would require a huge amount of queries on the database when >> creating the diffs. The positive side of this would that it would only have >> to be done once. > > If you are happy with supporting only zoom level 16 granularity, you can > store the tile x and tile y coordinates for each node, that's only 4 > bytes per node.
According to JonB[1] there have been about 84 Million tiles requested the last 6 months, this is the break down of how many tiles you can invalidate by using tileposition. Example: at zoom 16 you would get 54% less rerenders, if I haven't done this all wrong. Doesn't seem that costly to spend 300M*18bit*2=1,4GB and get 100%. Zoom| % of all tiles in this zoom an above 11 5.22% 12 8.22% 13 13.45% 14 23.26% 15 39.55% 16 54.57% 17 82.92% 18 100.00% archive from mailinglist: http://forum.openstreetmap.org/viewtopic.php?pid=2431#p2431 _______________________________________________ dev mailing list [email protected] http://lists.openstreetmap.org/listinfo/dev
