[OSM-dev] tiles tiles tiles

Jon Burgess jburgess at uklinux.net
Sat Dec 2 02:01:14 GMT 2006


On Wed, 2006-11-29 at 21:23 +0000, SteveC wrote:
> Using a bugfixed version of almiens tilecount.pl (which figures out what
> tiles actually have map data on them), I've written a script to render
> them (from zoom 0-18).
> 
> There are 1828075 such tiles to do, and at 25k per tile (most are less
> than this it seems) equates to 40 odd Gb of data. We currently have
> 973994 tiles live, or about half that number. So it's an easily
> acheivable target.
> 

I'm afraid there was a bug in tilecount.pl which broke the calculation
of tiles for zoom level 17 & 18. I've put the fix in SVN and this now
calculates 7606697 tiles need to be rendered.

I've also rewritten the tilecount script into C which is faster and uses
less memory than the Perl version. This is in all_tiles/C.

It looks like the projection system has an intended latitude limit of
+-85.0511 degrees. Should we be discarding any points outside this?

	Jon







More information about the dev mailing list