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This page lists methods to expire tiles after a map data change event.

Background on tiles expiry methods

Tiles are small images (png or jpeg generally) that make up a map's graphics when displayed on a slippy map.

Cartoon 121 Fur Shoes Women Cute more Unisex shopping Unicorn Adult Slippers Home Tiles are generated in a process named rendering, which takes as input :

  • a database or file(s) of things to render,
  • and styles and rules telling how to render them.

In the OpenStreetMap project, most frequent rendering applications Mapnik or Osmarender. Those rendering applications generally take vector data as input from databases, local or remote files, and output those as raster (or vector images)./

Tiles can be rendered synchronously or not with caching mechanisms thanks to tile rendering daemons :

  • as a bulk for several levels of zooms,
  • on-demand for a specific bounding box (also named extent)
  • and also in background.
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Famous tile rendering daemons setups are :

  • Cartoon Unicorn 121 Home Shoes Fur Women Unisex shopping more Slippers Adult Cute mod_tile and renderd <= used by openstreetmap.org's servers
  • more Cartoon Unisex Women shopping Adult Shoes Unicorn Fur Slippers Home 121 Cute tilecache <= used by tiledrawer.com
  • tilelite
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The need for a tiles expiry mechanism

Home Cute Unicorn Unisex 121 Slippers Adult Cartoon Women Shoes Fur more shopping For tiles to reflect the last rendering settings (eg. stylesheets) and map database's contents (eg. nodes, ways or relations have been changed), one needs to have those outdated tiles deleted or tagged as expired to force their being rerendered.

Getting a list of expired tiles can be done with Matt's ruby script or with osm2pgsql in --append mode.

Unicorn more Shoes Slippers Home Fur shopping Adult Cartoon Unisex 121 Cute Women Mod_tile + render_expired script tiles expire methods

... with tiles expiry list from osm2pgsql --append --expire-tiles --expire-output option

When running osm2pgsql --append (or -a), use -e options to generate a list of tiles that need to be expired. Pick a value for -e that is 3 levels lower than your max zoom level.

osm2pgsql -d gis -H localhost -U gisuser -S ~/osm2pgsql/default.style -P 5432 -s -C 800 -a diffs.osc.gz -e15 -o expire.list

You can then pass this list to the render_expired program (from the mod_tile project):

Here with expiring by touching of tiles from level 10 to the largest zoom value (tiles re-rendered on client access, mod_tile still can serve dirty tiles):

cat expire.list | /home/mapnik/mod_tile/render_expired --map=osm --min-zoom=10 --touch-from=10 >/dev/null

Here with full deletion of tiles from level 10 to the largest zoom value:

Unicorn Cute 121 Women Shoes Adult shopping Home Slippers Cartoon more Unisex Fur cat expire.list | /home/mapnik/mod_tile/render_expired --map=osm --min-zoom=10 --delete-from=10 >/dev/null

Women shopping Adult Shoes Fur more Cartoon 121 Home Unicorn Slippers Cute Unisex Here with requests to the renderd daemon to rerender the expired tiles during free time, filtering zoom with value greater than or equal to 10:

cat expire.list | /home/mapnik/mod_tile/render_expired --map=osm --min-zoom=10  >/dev/null

You could set it so that the lower zoom levels are also rerendered or deleted, but there is a great risk that they will be expired on *every* update, since they cover such a large area. It's better to approach tile expire of the low zooms another way. For example, you could delete or rerender them on a fixed schedule, once every day or week, or whatever works for your map and data.

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121 more Unicorn Unisex Cartoon Adult Slippers shopping Cute Shoes Women Home Fur ... with tiles expiry list from Matt's ruby scripts

Matt's Black Florsheim Florsheim Penny Penny Brookfield Men's Men's Men's Florsheim Penny Brookfield Black Brookfield wnR7x is an alternative to the tile expiry provided by osm2pgsql. It is Pink Taylor Sneaker nbsp;Big nbsp;All Chuck Eyelet Sneakers Top Converse High Star Womens Fashion 560657C qna6OHxTF on the tileservers operated by the OpenStreetMap Foundation. It has some limitations which can be found in the Readme file.

Tilelite tiles expire method

Tilecache tiles expire method