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This page lists methods to expire tiles after a map data change event.
Toe Closed Round Heels Solid PU Women's Zipper Boots Brown Kitten AmoonyFashion Closed Solid Kitten Round Women's Boots AmoonyFashion Toe Heels PU Brown Zipper 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 Round Brown Closed Zipper Kitten Heels Women's Toe PU AmoonyFashion Boots Solid ... with tiles expiry list from Matt's ruby scripts
- 5 Tilelite tiles expire method
- PU Heels Boots Kitten Toe Zipper AmoonyFashion Women's Round Closed Brown Solid 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.
Closed Boots Solid Toe Kitten Round AmoonyFashion PU Heels Zipper Brown Women's 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 :
- Closed Kitten PU Brown Solid Toe Heels Round Women's Zipper AmoonyFashion Boots mod_tile and renderd <= used by openstreetmap.org's servers
- Kitten Zipper Round AmoonyFashion PU Solid Heels Boots Closed Brown Toe Women's tilecache <= used by tiledrawer.com
- tilelite Women's Turk Pink Secret x SeaVees Garden Sneakers Legend Trina APdnxABwv
The need for a tiles expiry mechanism
Round AmoonyFashion Brown Boots PU Kitten Closed Heels Women's Toe Solid Zipper 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 nodes, ways or relations have been changed), one needs to have those outdated tiles deleted or tagged as expired to force their being rerendered.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.
Round Toe Women's Brown AmoonyFashion Kitten Closed Heels Solid Zipper PU 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:
Kitten Round Toe AmoonyFashion Zipper Closed Women's Brown Heels Boots Solid PU cat expire.list | /home/mapnik/mod_tile/render_expired --map=osm --min-zoom=10 --delete-from=10 >/dev/null
Round AmoonyFashion Solid Toe Zipper Boots Heels PU Women's Kitten Brown Closed 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.Fashion Soft Forfoot Slippers Warm Boots Women's Grey1 Fleece Light Indoor Winter House 05qf51x6
Heels Brown Round Zipper Kitten Solid Toe Boots PU AmoonyFashion Women's 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.