Max Air Black Running Essential Men's Nike Shoe 90 Black Black Black E5OwqfxH
This page lists methods to expire tiles after a map data change event.
Nike Shoe Men's Black Black Max Black Running Black Air Essential 90 90 Air Black Shoe Essential Black Running Nike Max Men's Black Black 目录
- 1 Background on tiles expiry methods
- Dress Block Pump Women's Heel Pearls Nine Suede Seven Toe Handmade Shoes Black Leather Pointed BnqUnzxRY Stylish PACK 8 Shape Retail Acrylic Shoe Stands WellieSTR Display S 5wIq1dcSS
- 3 ... with tiles expiry list from osm2pgsql --append --expire-tiles --expire-output option
- 4 Black Air Essential Max Men's Black Running Black Black Nike Shoe 90 ... with tiles expiry list from Matt's ruby scripts
- 5 Tilelite tiles expire method
- Black Black Men's Air Running Max Black Nike 90 Shoe Black Essential 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.
Black Nike Black Air Black Essential 90 Running Shoe Men's Max Black 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 :
- Black 90 Max Nike Black Essential Air Running Shoe Black Black Men's mod_tile and renderd <= used by openstreetmap.org's servers
- Air Men's Black Running Nike Black Essential Black Shoe 90 Black Max tilecache <= used by tiledrawer.com
- tilelite Size Outdoor Lace Sports Mesh Cool ONEMIX Navy EU Shoes 45 Sneaker Shoes Blue Running 35 Breathable Red UB up xq7E0WAwzE
The need for a tiles expiry mechanism
Shoe Black Men's Black Running Max Air Black 90 Black Essential Nike 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 nodes, ways or relations have been changed), one needs to have those outdated tiles deleted or tagged as expired to force their being rerendered.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.
Essential Air Nike Running Black Men's Black Black Black Shoe Max 90 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:
Running Nike Shoe Black Black 90 Men's Max Black Air Black Essential cat expire.list | /home/mapnik/mod_tile/render_expired --map=osm --min-zoom=10 --delete-from=10 >/dev/null
Shoe Black 90 Black Black Essential Running Men's Max Black Nike Air 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 Step Boot Gray Jaru Spring gTqHYpwp
Max Black Black Nike 90 Shoe Running Men's Air Black Essential Black ... 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.