I totally agree with you... but I'm not the mantainer of this code :) I think that a nre ticket is not necessary. Yuo could add new suggestions/ideas to the existing one.
giovanni 2015-03-27 10:04 GMT+01:00 Peter Borissow <peter.boris...@yahoo.com>: > Thanks Alex- > Do you think we should open a new ticket? > > Peter > > ------------------------------ > *From:* Alex Mandel <tech_...@wildintellect.com> > *To:* Peter Borissow <peter.boris...@yahoo.com>; G. Allegri < > gioha...@gmail.com> > *Cc:* "qgis-user@lists.osgeo.org" <qgis-user@lists.osgeo.org> > *Sent:* Thursday, March 26, 2015 5:10 PM > > *Subject:* Re: [Qgis-user] BBox Filter for WFS > > That's exactly how I would expect it to work. > > To cache a whole WFS and start seems overboard, in that case why > wouldn't you just download the data set. BBOX is a must for web services > as a main part of the purpose is to allow users to only grab the part > they need when they need it. > > Thanks, > Alex > > > > > On 03/26/2015 01:28 PM, Peter Borissow wrote: > > Thanks Giovanni- It seems to me that the "cache features" option and > the option to fetch only the features intersecting the current map extent > should be 2 separate options. > > > > For example, when I open a WFS layer, I might want to retrieve only the > features intersecting the current map extent. Once it is loaded, I would > want QGIS to cache the features. > > > > This is a common rendering technique used for WMS. A client requests an > initial BBOX and renders the image. The when the client pans, a new request > is made but only for the "missing" area. The original response is cached > and merged with the second response. Just a thought... > > > > > > Peter > > > > > > From: G. Allegri <gioha...@gmail.com> > > To: Peter Borissow <peter.boris...@yahoo.com> > > Cc: "qgis-user@lists.osgeo.org" <qgis-user@lists.osgeo.org> > > Sent: Thursday, March 26, 2015 1:27 PM > > Subject: Re: [Qgis-user] BBox Filter for WFS > > > > As Marco explained in the realted post on qgis-dev the bbox filter > should be used if "cahce features" option is turned off, but at the moment > it seems broken, maybe because of new improvements in the rendering > process. The issue has been already reported in > http://hub.qgis.org/issues/11968 > > In the meanwhile a manual filter could be set within the WFS add layer > dialog. > > giovanni > > 2015-03-26 16:07 GMT+01:00 G. Allegri <gioha...@gmail.com>: > > > > > > > > It's an intereseting question Peter. I've verified that the wfs provider > still requests the whole data the first time, then it stores eveything (and > create a spatial index for subsequent calls).I suppose that sponsoring this > feature could be the right way to have it, but I'm curious to know what the > latest answer from Marco was referring to (I mean within the svn code he > indicates) [1] > > Giovanni > > [1] http://hub.qgis.org/issues/1421#note-4 > > 2015-03-25 12:25 GMT+01:00 Peter Borissow <peter.boris...@yahoo.com>: > > > > Sorry for being impatient but I was wondering if anyone can shed some > light on this issue. > > I have a WFS that's serving out over a billion features (several million > records per layer). When I add a layer from the WFS into QGIS, it calls > DescribeFeature and then GetFeature without a BBOX filter. QGIS then waits > for ALL of the data to come back (which can take a while). > > In the past, there was an option only fetch features that intersect the > current map extent. Without this option, it is extremely difficult to do > anything with the WFS using QGIS. > > > > IMHO, this is a pretty significant bug but hopefully one that should be > really easy to fix. Afterall, the code was there at some point... > > > > > > Related (unanswered) questions on stack exchange: > > > > > http://gis.stackexchange.com/questions/53387/quantumgis-1-8-how-to-define-bounding-box-within-add-wfs-layer-dialog > > > http://gis.stackexchange.com/questions/59656/is-there-free-desktop-wfs-client-with-bbox-support > > > > Thanks,Peter > > > > > > > > From: Peter Borissow <peter.boris...@yahoo.com> > > To: "qgis-user@lists.osgeo.org" <qgis-user@lists.osgeo.org> > > Sent: Monday, March 23, 2015 2:03 PM > > Subject: BBox Filter for WFS > > > > Hello- I noticed that the WFS client in QGIS 2.8 and 2.6 do not seem > to pass a bbox filter when requesting features. > > > > It seems that in the past, QGIS had an option to only fetch features > that intersect the current map extent: > > > > http://hub.qgis.org/issues/1421 > > > > Based on this thread, it looks like this feature was disabled in 1.8: > > http://osdir.com/ml/qgis-user-gis/2011-10/msg00308.html > > > > Is this feature still missing or is there a way to enable this feature > in the latest release? > > > > Thanks,Peter > > > > > > > > > > > > > -- Giovanni Allegri http://about.me/giovanniallegri Gis3W - http://gis3w.it Ikare - http://ikare.it Twitter: https://twitter.com/_giohappy_ blog: http://blog.spaziogis.it GEO+ geomatica in Italia http://bit.ly/GEOplus
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