On 2/9/22 06:44, Andrew Hughes wrote:
We have a WFS layer that QGIS v3 appears to be caching and I would like to
disable this. The experience is, when we zoom in we don't get additional detail
- since we limit the number of features to 20K.
p.s. is this a common caching pattern/feature of QGIS that is not limited tow
WFS alone?
Yes. QGIS is 'caching' features in a sqlite database. It's doing that because
in WFS2 you can 'page' through your data, and QGIS will request data based on
id's or bbox which are not there yet.
There are some options to make in de WFS provider dialog (connection part) that
you can try:
1) make sure you 'force' version 2.0 AND 'enable feature paging', then QGIS
will request the max allowed number of features, AND then start 'paging' to get
more
2) earlier there was a button to only request features in current extent, but I
think that is on now by default.
IF paging is not working then you should (if you zoom in to an area with < then
20K features) you should receive all features in that area.
WFS is NOT scale dependent off course, so not sure what you mean by 'addition
detail' (maybe you mean additional 'features')?
3) are you using latest version? There has been some work in this area last
versions.
4) can you share your wfs url? So others can try?
For what I know no other providers do this caching in the sqlite (though WMS
caches images, see network settings where you can clean the cache, or make it
small).
Regards,
Richard Duivenvoorde
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