[Qgis-user] BBox Filter for WFS

Thu Apr 2 09:28:30 PDT 2015

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, Switzerland
marco.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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