Potlatch downloads the tiles. >From Firebug:
http://us.maps3.yimg.com/aerial.maps.yimg.com/img?md=1204827325&x=252545&y=147064&z=21&r=1&v=1.7&t=a http://us.maps3.yimg.com/aerial.maps.yimg.com/img?md=1204827325&x=252550&y=147065&z=21&r=1&v=1.7&t=a etc. The white tiles with the nice message are about 4kb. The first level of aerial images available above that are about 15kb. http://us.maps3.yimg.com/aerial.maps.yimg.com/img?md=1204827325&x=63137&y=36765&z=19&r=1&v=1.7&t=a Is Potlatch really detecting the 'white tiles' or just displaying them? David. On Thu, Dec 10, 2009 at 8:02 PM, Boris Cornet <[email protected]> wrote: > Hello Chris! > > Today (Friday, December 11, 2009) at 01:38 you typed: > >> Apparently, even Yahoo do not know where pictures at a given zoom level are >> available... >> I wonder how Potlach does it? > Maybe it checks the file size. These tiles are probably significantly > smaller than normal tiles due to compression. As far as I can tell, > Potlach actually downloads the tiles, since you can see them for a > very short while. > > -- > Bye, > Boris > > > _______________________________________________ > Merkaartor mailing list > [email protected] > http://lists.openstreetmap.org/listinfo/merkaartor > _______________________________________________ Merkaartor mailing list [email protected] http://lists.openstreetmap.org/listinfo/merkaartor
