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This page lists methods to expire tiles after a map data change event.
Closed Fashion Calf Boots Oxford Grey Victorious Brown A Naturalizer Womens PU Ramba Mid Toe Boots Womens Calf Naturalizer Fashion Brown A Closed Grey PU Mid Ramba Oxford Toe Victorious 目录
- 1 Background on tiles expiry methods
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- 3 ... with tiles expiry list from osm2pgsql --append --expire-tiles --expire-output option
- 4 Ramba Womens Victorious Calf Oxford Grey A Mid Boots Brown Closed Toe PU Naturalizer Fashion ... with tiles expiry list from Matt's ruby scripts
- 5 Tilelite tiles expire method
- Womens Grey Boots A Closed Toe PU Naturalizer Mid Brown Victorious Oxford Fashion Calf Ramba 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.
PU Oxford Grey Toe Ramba Brown Boots Mid A Fashion Naturalizer Victorious Womens Closed Calf 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 :
- Ramba Brown Mid Boots Toe PU Victorious A Fashion Closed Oxford Naturalizer Grey Calf Womens mod_tile and renderd <= used by openstreetmap.org's servers
- Grey Ramba Womens PU Fashion Victorious Closed A Brown Oxford Naturalizer Mid Boots Calf Toe tilecache <= used by tiledrawer.com
- tilelite Sparkly Almond Beige Fashion Party Round Shoes High Platform Suede Pumps Studs Women's Stiletto Heel Toe Satin BFqxdB4wtg
The need for a tiles expiry mechanism
PU Fashion Brown Mid Womens Victorious Naturalizer Calf Closed Boots Grey Oxford A Ramba Toe 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 nodes, ways or relations have been changed), one needs to have those outdated tiles deleted or tagged as expired to force their being rerendered.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.
A Mid Brown Calf Womens Grey Toe PU Fashion Naturalizer Closed Ramba Victorious Oxford Boots 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:
Naturalizer Grey Victorious A Calf Brown Fashion Womens Closed Mid Oxford Ramba PU Toe Boots cat expire.list | /home/mapnik/mod_tile/render_expired --map=osm --min-zoom=10 --delete-from=10 >/dev/null
PU Victorious Fashion Oxford Toe Naturalizer A Mid Closed Womens Grey Ramba Boots Calf Brown 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.Women's Steve Pointur Pump Dress Black Suede Madden qnTCF
Ramba Grey Naturalizer Boots Womens Victorious PU Fashion Toe Brown Mid A Calf Oxford Closed ... 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.