Hi Brad and Andrea,
Thank you very much for your reply. Andre got my point, "better
performance" means that Qgis renders WMTS services faster than WMS which is
Integrated in GWC. Andrea, thank you very much for the explanation.
I appreciated your time
Regards
Julierme
2018-02-03 7:50 GMT-02:00 Andrea Aime <andrea.a...@geo-solutions.it>:
> On Fri, Feb 2, 2018 at 7:49 PM, Julierme Pinheiro <
> juliermeopensourcedevelo...@gmail.com> wrote:
>
>> I am loading theses services in QGIS and realized that the wms connection
>> is slower than the wmts. I did not understand why wms is slower because I
>> set Caching Defaults (box checked) Enable direct integration with GeoServer
>> WMS.
>>
>> In my case, the wmts is having a better performance in Qgis.
>>
>> Could someone explain me why wmts has a better performance, even though
>> is integrated with the wms?
>>
>
> I'm assuming you're saying it's slower because it takes more time to
> render the maps, by the naked eye, right?
> The reason is actually quite simple, WMS has to draw the map every time,
> WMTS caches tiles and renders them.
>
> The "integration" is not doing you any good in QGIS, because QGIS does not
> know about it and does not leverage it.
> The integration works by having GWC intercept requests, and if they happen
> to exactly match a cached tile, the tile
> will be sent back immediately and the WMS will be dodged.
> However QGIS think it's talking to a normal WMS and does not know about
> the supported tile structures, so it's probably
> doing a singe screen wise request (or tiled requests that are not matching
> the cached tiles).
>
> GWC also has a "full WMS" mode where it builds non tiled WMS responses by
> stitching and rescalilng cached tiles,
> see here on how to enable it (there is no UI for it as far as I know,
> you'll have to edit config files manually):
> http://docs.geoserver.org/latest/en/user/geowebcache/
> using.html#geowebcache-endpoint-url
>
> Mind though, if you want to use it, you'll have to send QGIS the URL of
> the WMS-C protocol (the WMS managed by GWC),
> the quality of the outputs will be lower, due to the rescaling, and
> performance will be somewhere in between a WMTS
> and a WMS that renders on the fly.
>
> Hope this helps
>
> Cheers
> Andrea
>
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