[OSM-dev] How is the tile-index implemented/used?
Daniel Gilbert
osmmaillst at danielgilbert.de
Thu May 14 11:55:43 BST 2009
Hi everybody,
My name is Daniel Gilbert, I am 22 years old and I am currently working
on an offline routing tool for windows. Well, to be honest, I am still
at the beginning. The idea has grown over weeks and months, and now I am
somehow stuck. I'm wondering how I can create a tile from the raw data.
I plan to use the same scheme like Osmrender or Mapnik do (this
"z/x/y.png" thingy...).
But how do I know which ways or nodes are in the tile
"15/17192/10659.png"? Well, I took a closer look at the database scheme
and noticed the "tile" column in the "ways" table. After reading a (er,
no, THE) German OpenStreetMap - book, I came across this little article
on the wiki:
http://wiki.openstreetmap.org/wiki/Quadtile
As one might see, there are lots of "FIXME"'s and unfortunately no
information about how the conversion is done at the moment.
Can anyone explain the usage of this field and how the information is
stored?
Greetings,
Daniel
P.s.: Sorry for my poor english, but I'm not a native speaker. And btw
this is my first post on a mailinglist, so I'm somehow excited... :)
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