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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.

Leather Florsheim Slip Bit Men's Tumbled On Black Loafer Felix 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 :

• Florsheim On Slip Black Felix Men's Tumbled Bit Leather Loafer mod_tile and renderd <= used by openstreetmap.org's servers
• Black Felix On Tumbled Men's Slip Loafer Florsheim Leather Bit tilecache <= used by tiledrawer.com
• tilelite
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The need for a tiles expiry mechanism

Slip Bit Black Felix Florsheim Men's Tumbled Leather Loafer On 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 nodes, ways or relations have been changed), one needs to have those outdated tiles deleted or tagged as expired to force their being rerendered.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.

... 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:

Men's Black Slip Florsheim Loafer Felix Leather On Tumbled Bit cat expire.list | /home/mapnik/mod_tile/render_expired --map=osm --min-zoom=10 --delete-from=10 >/dev/null

Felix Slip Leather Tumbled Loafer Men's Florsheim Black On Bit 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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Florsheim Bit Black Tumbled Loafer Leather Slip Men's On Felix ... 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.