The GeoServer GWC docs are here: http://docs.geoserver.org/stable/en/user/geowebcache/index.html
The published zoom levels are the zoom levels at which GWC will attempt to serve tiles. The cached zoom levels are the levels at which it will cache the tiles it serves.
The integrated mode works like this:
A request comes in to the GeoServer WMS.
GeoServer checks if the request has the “tiled” parameter set. If not it handles the request normally.
If tiled is set, GWC will attempt to handle the request as if the request had been made directly to GWC. If the request doesn’t align to the grid it will fail. If the request does align, it will check the cache, and return the tile if it exists, otherwise it will request the image from GeoServer directly and cache it.
If GWC fails to handle the request, GeoServer then tries to handle it directly (without any caching) This handles anything that wasn’t aligned to a tile grid that GWC knows about.
When using WMS-C, the zoom level and scale is computed from the request. The request includes the extent of the image and the size of it. GeoWebCache can use this to figure out a matching Grid/Zoomlevel if there is a matching one, GeoServer can use it to figure out a scale for the purposes of scale dependant styling.
–
Kevin Michael Smith
smithkm@anonymised.com
On Wed, Oct 7, 2015, at 10:25 PM, Jussila Ville wrote:
Dear list,
I have some questions about Geowebcache. I’m running with Geoserver 2.7.0 and Geowebcache 1.7.0 and I’m using direct integration with Geoserver WMS.
First. Is there any webpage or manual about the Edit Layer’s fourth tab, Tile caching, where is some info about Tile caching and what does these parameters do? Example what is Published zoom level parameters for?
Second. How does Geoserver use tiles and how does it choose which set of tiles it is using? Does it use the Scale level which is used at gridset or where? I would like to tile my map at one certain zoom level, example 1:25000 and use those tiles also at level 1:30000, 1:5000 etc. At bigger scale levels I want to use original datasource. Is this possible?
Many thanks
Ville Jussila
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