On 2021-02-25 3:24 p.m., Richard Duivenvoorde wrote:
On 2/13/21 8:01 PM, pathmapper wrote:
Hi,
here's a related thread (i.e. xyz tiles, but I guess it's also valid vor wms):
https://github.com/qgis/QGIS/issues/34813
Some quotes:
"QGIS renders the surrounding areas in a background job to make subsequent pan
actions faster. Therefore it sends more tile requests than necessary for the current map
extent."
"Btw, we now have the code in place to fine-tune prefetching behavior for all raster
layers on a per-layer basis, for now I just blacklisted osm tiles."
It sounds like the plan is to make the prefetching behavior configurable via
QGIS settings.
See https://github.com/qgis/QGIS/pull/41832 to prevent prefetching for true
WMS's...
Now I like to have some input indeed making prefetching behaviour more
configurable:
- where to put a checkbox/setting about prefetching tiles (global raster, or
per wms service or just global, or a hidden setting)?
- what to make default (with or without prefetching...?)
My first idea:
- add a checkbox "Prefetch surrounding WMS(T) images" in the WMS/WMTS
Connection dialog in the 'WMS/WMTS Options' section; default FALSE (unless see below)
- In General Options / Network / Cache Settings add a tab or just a checkbox with
"Default prefetch WMS(T) images" (defaulting to FALSE, but if enabled the above
mentioned checkbox will always be enabled too)
- also make this an option in the provider uri
I really like that Richard, since I am always in the
Settings/Options/CacheSettings to clear my cache anyway (as I am
constantly changing already-parsed WMS services), having a checkbox in
the "Content" tab of "Default prefetch WMS(T) images" (default to false)
makes sense.
I also like having a checkbox in the WMS/WMTS dialog, in the 'Options'
section near bottom, defaulting to false.
(so I'm in total agreement to both your proposals, ha)
Big thanks from the east coast of Canada!
-jeff
--
Jeff McKenna
GatewayGeo: MapServer Consulting and Training Services
co-founder of FOSS4G
http://gatewaygeo.com/
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