[Qgis-user] BBox Filter for WFS

Thu Apr 2 10:04:58 PDT 2015

Thanks Marco ;)
I will test it tomorrow.
Il 02/apr/2015 18:29 "Peter Borissow" <peter.borissow at yahoo.com> ha scritto:

> Wow, this is great news! I can't wait to test it.
>
> Thanks for your help!
> Peter
>
>   ------------------------------
>  *From:* Marco Hugentobler <marco.hugentobler at sourcepole.ch>
> *To:* qgis-user at lists.osgeo.org; peter.borissow at yahoo.com
> *Sent:* Thursday, April 2, 2015 11:34 AM
> *Subject:* Re: [Qgis-user] BBox Filter for WFS
>
> Hi all
>
> I've added the checkbox to only load the features intersecting the current
> extent (
> https://github.com/qgis/QGIS/commit/e4e4839823fad1b980cb815889c18edb9c4352b7
> ).
>
> Regards,
> Marco
>
> --
> Dr. Marco Hugentobler
> Sourcepole -  Linux & Open Source Solutions
> Weberstrasse 5, CH-8004 Zürich, Switzerlandmarco.hugentobler at sourcepole.ch http://www.sourcepole.ch
> Technical Advisor QGIS Project Steering Committee
>
>
>
> On 31.03.2015 12:01, Peter Borissow wrote:
>
>
>
> Thanks Giovanni-
>     Do you know when the dev team is planning the next release? I wonder
> if there's time to get this fixed before the next release.
>
>  Peter
>
>   ------------------------------
>  *From:* G. Allegri <giohappy at gmail.com>
> *To:* Peter Borissow <peter.borissow at yahoo.com>
> *Cc:* "tech at wildintellect.com" <tech at wildintellect.com>;
> "qgis-user at lists.osgeo.org" <qgis-user at lists.osgeo.org>
> *Sent:* Tuesday, March 31, 2015 5:15 AM
> *Subject:* Re: [Qgis-user] BBox Filter for WFS
>
>  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.borissow at yahoo.com>:
>
>
>    Thanks Alex-
>     Do you think we should open a new ticket?
>
>  Peter
>
>      ------------------------------
>  *From:* Alex Mandel <tech_dev at wildintellect.com>
> *To:* Peter Borissow <peter.borissow at yahoo.com>; G. Allegri <
> giohappy at gmail.com>
> *Cc:* "qgis-user at lists.osgeo.org" <qgis-user at 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 <giohappy at gmail.com>
> >  To: Peter Borissow <peter.borissow at yahoo.com>
> > Cc: "qgis-user at lists.osgeo.org" <qgis-user at 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 <giohappy at 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.borissow at 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.borissow at yahoo.com>
> >  To: "qgis-user at lists.osgeo.org" <qgis-user at 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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