[Qgis-developer] QGIS server renders tiled map annotations on every tile

[Neumann, Andreas]

Or maybe you could use something like MapProxy - which allows to fetch a
bigger chunk of the data in a single request and chops it up into the
tiles and caches them. Then the tiles wouldn't be served by QGIS server
directly, but from the MapRroxy. 

MapProxy has a concept of "MetaTiles" to help solve this label issue -
see http://mapproxy.org/docs/nightly/labeling.html 

I am not really experienced with it - my guess is that the "MetaTiles"
only partially solves the issue, but doesn't fully fix it. 

Andreas 

On 2016-02-18 17:25, Alessandro Pasotti wrote:

> 2016-02-18 17:07 GMT+01:00 Régis Haubourg <regis.haubourg at eau-adour-garonne.fr>:
> 
>> Hi,
>> I'm having some map annotation on some project, not pinned to a location. I
>> use it to let user see some informations about the map he is using (metadata
>> are to deeply hidden in project properties for that).
>> When asking qgis server to render tiles on any layer, every tile show the
>> annotation.
>> Is there an option to avoid that ? If not, should annotation been rendered
>> in Qgis server context?
>> 
>> Cheers
>> Régis
> 
> Hello, 
> 
> from QGIS Server point of view, a tile is just a small map, it doesn't have any information about the fact that the tile will be patched to build a bigger map.
> 
> You should disable annotations from the project configuration if you are planning to serve the map as tiles.
> 
> If you want to keep that configurable, you might want to move annotations to a particular layer and selectively show/hide that layer depending on the requested image size, a simple Server plugin could be helpful in that case.
> 
> -- 
> Alessandro Pasotti
> w3:   www.itopen.it [1] 
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