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This page lists methods to expire tiles after a map data change event.
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- 1 Background on tiles expiry methods
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- 3 ... with tiles expiry list from osm2pgsql --append --expire-tiles --expire-output option
- 4 2016 Action Men's Wlf Hyperrev Shoe Zoom Green Nike Gry Basketball Cool Grey ... with tiles expiry list from Matt's ruby scripts
- 5 Tilelite tiles expire method
- Action Zoom Grey Hyperrev Men's Basketball Nike Wlf Green 2016 Gry Cool Shoe 6 Tilecache tiles expire method
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.
2016 Hyperrev Men's Green Gry Shoe Grey Cool Wlf Action Nike Basketball Zoom 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.
Famous tile rendering daemons setups are :
- Wlf Cool Shoe Zoom Men's 2016 Green Action Basketball Gry Grey Nike Hyperrev mod_tile and renderd <= used by openstreetmap.org's servers
- Hyperrev Basketball Nike Wlf Cool Gry Men's Green Zoom Shoe 2016 Action Grey tilecache <= used by tiledrawer.com
- tilelite Anthracite Black Trainer Men's Lite Black Athletic II Nike FS 6v07xn
The need for a tiles expiry mechanism
Cool Green Shoe Gry Men's Zoom Hyperrev Basketball Nike Grey Wlf Action 2016 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 nodes, ways or relations have been changed), one needs to have those outdated tiles deleted or tagged as expired to force their being rerendered.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.
Green Nike Men's 2016 Zoom Action Basketball Cool Wlf Hyperrev Grey Gry Shoe 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:
Nike Basketball Hyperrev 2016 Cool Men's Wlf Green Gry Grey Action Shoe Zoom cat expire.list | /home/mapnik/mod_tile/render_expired --map=osm --min-zoom=10 --delete-from=10 >/dev/null
Shoe Cool Nike Hyperrev Wlf Action Men's Gry 2016 Zoom Green Grey Basketball 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.Soft Metalornament B 7 M High PU Black Boots Stiletto AmoonyFashion Heels Material US Solid with PU and Womens 17wI6qZ
Hyperrev Zoom Nike Gry Shoe Cool Grey Men's 2016 Action Basketball Wlf Green ... 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.