Re: [Qgis-user] Qgis-user Digest, Vol 109, Issue 55

[Paolo Cavallini]

Il 26/03/2015 21:27, azizul haque ha scritto:
> Hi Paolo,
> Thanks. Yes I am using QGIS 2.0.1(DUFOUR). You advised me to upgrade it.
> But I did many projects with this version. If I would upgrade some
> projects may not work.
> Any help

Hi Azizul,
IMHO not upgrading for such a long time will only cause more trouble
than it solves. You may vae issues in upgrading your projects, but the
hundreds new functions and bugfixes are worth the while.
In any case, older versions are not officially supported, so you're on
your own, unless you want to hire somebody to fix your problems.
All the best.

-- 
Paolo Cavallini - www.faunalia.eu
QGIS & PostGIS courses: http://www.faunalia.eu/training.html
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Re: [Qgis-user] BBox Filter for WFS

[Alex Mandel]

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 
>  To: Peter Borissow  
> Cc: "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 :
> 
> 
> 
> 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 :
> 
> 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 
>  To: "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
> 
> 
> 

> 

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Re: [Qgis-user] BBox Filter for WFS

[Peter Borissow]

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 
 To: Peter Borissow  
Cc: "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 :



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 :

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 
 To: "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




   
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Giovanni Allegri
http://about.me/giovanniallegriGis3W - http://gis3w.itIkare - http://ikare.it
Twitter: https://twitter.com/_giohappy_blog: http://blog.spaziogis.it
GEO+ geomatica in Italia http://bit.ly/GEOplus



-- 
Giovanni Allegri
http://about.me/giovanniallegriGis3W - http://gis3w.itIkare - 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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Re: [Qgis-user] Qgis-user Digest, Vol 109, Issue 55

[azizul haque]

File 
"/Applications/QGIS.app/Contents/MacOS/../Resources/python/qgis/utils.py", line 
453, in _import
? ? mod = _builtin_import(name, globals, locals, fromlist, level)
? File 
"/Users/ahaque/.qgis2/python/plugins/processing/algs/qgis/ui/FieldsMapperDialogs.py",
 line 38, in 
? ? from .FieldsMappingPanel import FieldsMappingPanel
? File 
"/Applications/QGIS.app/Contents/MacOS/../Resources/python/qgis/utils.py", line 
453, in _import
? ? mod = _builtin_import(name, globals, locals, fromlist, level)
? File 
"/Users/ahaque/.qgis2/python/plugins/processing/algs/qgis/ui/FieldsMappingPanel.py",
 line 34, in 
? ? from qgis.gui import QgsFieldExpressionWidget
ImportError: cannot import name QgsFieldExpressionWidget

Python version:
2.7.5 (default, Mar? 9 2014, 22:15:05) 
[GCC 4.2.1 Compatible Apple LLVM 5.0 (clang-500.0.68)]


QGIS version:
2.0.1-Dufour Dufour, f738351

Python path: ['/Applications/QGIS.app/Contents/MacOS/../Resources/python', 
'/Users/ahaque/.qgis2/python', '/Users/ahaque/.qgis2/python/plugins', 
'/Applications/QGIS.app/Contents/MacOS/../Resources/python/plugins', 
'/Library/Frameworks/SQLite3.framework/Versions/B/Python/2.7', 
'/Library/Frameworks/GEOS.framework/Versions/3/Python/2.7', 
'/Library/Python/2.7/site-packages/numpy-override', 
'/Library/Python/2.7/site-packages/matplotlib-override', 
'/Library/Frameworks/GDAL.framework/Versions/1.11/Python/2.7/site-packages', 
'/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python27.zip', 
'/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7', 
'/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-darwin',
 
'/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac',
 
'/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac/lib-scriptpackages',
 '/System/Library/Frameworks/Python.framework/Versions
 /2.7/Extras/lib/python', 
'/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-tk',
 
'/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-old',
 
'/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-dynload',
 
'/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/PyObjC',
 '/Library/Python/2.7/site-packages'] 



    On Thursday, 26 March 2015, 12:39, "qgis-user-requ...@lists.osgeo.org" 
 wrote:
  

 Send Qgis-user mailing list submissions to
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To subscribe or unsubscribe via the World Wide Web, visit
??? http://lists.osgeo.org/mailman/listinfo/qgis-user
or, via email, send a message with subject or body 'help' to
??? qgis-user-requ...@lists.osgeo.org

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When replying, please edit your Subject line so it is more specific
than "Re: Contents of Qgis-user digest..."


Today's Topics:

? 1. Re: Plugins are broken (Paolo Cavallini)
? 2. Re: Plugins are broken (Etienne Trimaille)
? 3. Re: rule based classification - attribute based on??? other
? ? ? layer (Matteo Ghetta)
? 4. Re: rule based classification - attribute based on??? other
? ? ? layer (Matteo Ghetta)
? 5. measure processing time (research difference Qgis and??? ArcGIS)
? ? ? (Pieter Stevens)
? 6. Re: BBox Filter for WFS (G. Allegri)
? 7. Re: rule based classification - attribute based on??? other
? ? ? layer (Matteo Ghetta)
? 8. Re: rule based classification - attribute based on other
? ? ? layer (Andreas Neumann)
? 9. Re: BBox Filter for WFS (G. Allegri)


--

Message: 1
Date: Thu, 26 Mar 2015 14:29:06 +0100
From: Paolo Cavallini 
To: qgis-user@lists.osgeo.org
Subject: Re: [Qgis-user] Plugins are broken
Message-ID: <551409a2.7050...@faunalia.it>
Content-Type: text/plain; charset=windows-1252

Il 26/03/2015 14:23, azizul haque ha scritto:
> Dear QGIS Users,
> As I sent a message to you all that Processing, QuickOSM and Buffer by
> percentage plugin are broken. I could not recovery it yet.

Hi Azizul,
what is the error message?
All the best.

-- 
Paolo Cavallini - www.faunalia.eu
QGIS & PostGIS courses: http://www.faunalia.eu/training.html


--

Message: 2
Date: Thu, 26 Mar 2015 15:32:50 +0200
From: Etienne Trimaille 
To: Paolo Cavallini 
Cc: qgis-user 
Subject: Re: [Qgis-user] Plugins are broken
Message-ID:
??? 
Content-Type: text/plain; charset="utf-8"

Azizul, in another topic, you said that you are using QGIS 2.0.1.
First, you should upgrade to 2.8.1.

2015-03-26 15:29 GMT+02:00 Paolo Cavallini :

> Il 26/03/2015 14:23, azizul haque ha scritto:
> > Dear QGIS Users,
> > As I sent a messag

Re: [Qgis-user] Qgis-user Digest, Vol 109, Issue 54

[azizul haque]

S.framework/Versions/3/Python/2.7', 
'/Library/Python/2.7/site-packages/numpy-override', 
'/Library/Python/2.7/site-packages/matplotlib-override', 
'/Library/Frameworks/GDAL.framework/Versions/1.11/Python/2.7/site-packages', 
'/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python27.zip', 
'/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7', 
'/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-darwin',
 
'/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac',
 
'/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac/lib-scriptpackages',
 '/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python', 
'/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-tk',
 
'/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-old',
 
'/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-dynload',
 
'/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/PyObjC',
 '/Library/Python/2.7/site-packages'] 



 On Thursday, 26 March 2015, 12:39, "qgis-user-requ...@lists.osgeo.org" 
 wrote:
   

 Send Qgis-user mailing list submissions to
    qgis-user@lists.osgeo.org

To subscribe or unsubscribe via the World Wide Web, visit
    http://lists.osgeo.org/mailman/listinfo/qgis-user
or, via email, send a message with subject or body 'help' to
    qgis-user-requ...@lists.osgeo.org

You can reach the person managing the list at
    qgis-user-ow...@lists.osgeo.org

When replying, please edit your Subject line so it is more specific
than "Re: Contents of Qgis-user digest..."


Today's Topics:

  1. Re: Plugins are broken (Paolo Cavallini)
  2. Re: Plugins are broken (Etienne Trimaille)
  3. Re: rule based classification - attribute based on    other
      layer (Matteo Ghetta)
  4. Re: rule based classification - attribute based on    other
      layer (Matteo Ghetta)
  5. measure processing time (research difference Qgis and    ArcGIS)
      (Pieter Stevens)
  6. Re: BBox Filter for WFS (G. Allegri)
  7. Re: rule based classification - attribute based on    other
      layer (Matteo Ghetta)
  8. Re: rule based classification - attribute based on other
      layer (Andreas Neumann)
  9. Re: BBox Filter for WFS (G. Allegri)


--

Message: 1
Date: Thu, 26 Mar 2015 14:29:06 +0100
From: Paolo Cavallini 
To: qgis-user@lists.osgeo.org
Subject: Re: [Qgis-user] Plugins are broken
Message-ID: <551409a2.7050...@faunalia.it>
Content-Type: text/plain; charset=windows-1252

Il 26/03/2015 14:23, azizul haque ha scritto:
> Dear QGIS Users,
> As I sent a message to you all that Processing, QuickOSM and Buffer by
> percentage plugin are broken. I could not recovery it yet.

Hi Azizul,
what is the error message?
All the best.

-- 
Paolo Cavallini - www.faunalia.eu
QGIS & PostGIS courses: http://www.faunalia.eu/training.html


--

Message: 2
Date: Thu, 26 Mar 2015 15:32:50 +0200
From: Etienne Trimaille 
To: Paolo Cavallini 
Cc: qgis-user 
Subject: Re: [Qgis-user] Plugins are broken
Message-ID:
    
Content-Type: text/plain; charset="utf-8"

Azizul, in another topic, you said that you are using QGIS 2.0.1.
First, you should upgrade to 2.8.1.

2015-03-26 15:29 GMT+02:00 Paolo Cavallini :

> Il 26/03/2015 14:23, azizul haque ha scritto:
> > Dear QGIS Users,
> > As I sent a message to you all that Processing, QuickOSM and Buffer by
> > percentage plugin are broken. I could not recovery it yet.
>
> Hi Azizul,
> what is the error message?
> All the best.
>
> --
> Paolo Cavallini - www.faunalia.eu
> QGIS & PostGIS courses: http://www.faunalia.eu/training.html
> ___
> Qgis-user mailing list
> Qgis-user@lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/qgis-user
>
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Message: 3
Date: Thu, 26 Mar 2015 15:53:05 +0100
From: Matteo Ghetta 
To: t...@wildintellect.com
Cc: QGIS Mailing List 
Subject: Re: [Qgis-user] rule based classification - attribute based
    on    other layer
Message-ID:
    
Content-Type: text/plain; charset="utf-8"

>
> Sounds like you are trying Red if valueA > max(layer B value)?
>

exactly... :)
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---

Re: [Qgis-user] BBox Filter for WFS

[G. Allegri]

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 :

> 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 :
>
>> 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 
>> *To:* "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
>>
>>
>>
>>
>>
>> ___
>> Qgis-user mailing list
>> Qgis-user@lists.osgeo.org
>> http://lists.osgeo.org/mailman/listinfo/qgis-user
>>
>
>
>
> --
> 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
>



-- 
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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Re: [Qgis-user] rule based classification - attribute based on other layer

[Andreas Neumann]

Hi,

Note that, if you work on QGIS 2.8, getFeature() and attribute() are 
already part of core - no need to install a plugin.


However, there may be a quite negative impact on performance, if you 
include such functions in your symbology impressions. So use them with 
care, only if you really need them!


Andreas

On 26.03.2015 16:10, Matteo Ghetta wrote:

sorry... plugin installed...
I see all the functions in the field calculator but do you have a 
small and quick example of what I am looking for?

I don't understand the function to use..

Thanks!

Matteo

2015-03-25 19:11 GMT+01:00 Junior Delaz >:


Hello,
You may give a look to /getFeature/ function (combining or not
with function like /attribute/ or spatial ones). There is also
/RefFunctions/ plugin that may help to use values/fields of
another layer.
But unfortunately, there is no list of such layers nor their
fields in the dialog. You need to write them yourself and their
values.

2015-03-25 18:14 GMT+01:00 Matteo Ghetta mailto:matteo.ghe...@gmail.com>>:

Hi all,
very simple question.
In the rule-based classification (vector) is it possible to
use values of another layer loaded in QGIS?

For example. Point vector and I want to display as red each
feature that has a value greater than a value stored in
another point layer (or in a table).
In the expression builder there are the fields of the active
layer.

Is it possible to call the fields of other layers?

Thanks

Cheers

Matteo



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Re: [Qgis-user] rule based classification - attribute based on other layer

[Matteo Ghetta]

sorry... plugin installed...
I see all the functions in the field calculator but do you have a small and
quick example of what I am looking for?
I don't understand the function to use..

Thanks!

Matteo

2015-03-25 19:11 GMT+01:00 Junior Delaz :

> Hello,
> You may give a look to *getFeature* function (combining or not with
> function like *attribute* or spatial ones). There is also *RefFunctions*
> plugin that may help to use values/fields of another layer.
> But unfortunately, there is no list of such layers nor their fields in the
> dialog. You need to write them yourself and their values.
>
> 2015-03-25 18:14 GMT+01:00 Matteo Ghetta :
>
>> Hi all,
>> very simple question.
>> In the rule-based classification (vector) is it possible to use values of
>> another layer loaded in QGIS?
>>
>> For example. Point vector and I want to display as red each feature that
>> has a value greater than a value stored in another point layer (or in a
>> table).
>> In the expression builder there are the fields of the active layer.
>>
>> Is it possible to call the fields of other layers?
>>
>> Thanks
>>
>> Cheers
>>
>> Matteo
>>
>>
>>
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>
>
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Re: [Qgis-user] BBox Filter for WFS

[G. Allegri]

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 :

> 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 
> *To:* "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
>
>
>
>
>
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[Qgis-user] measure processing time (research difference Qgis and ArcGIS)

[Pieter Stevens]

Dear sir,

Dear madam,

 

As a student of the university Ghent I'm researching the differences and
similarities between ArcGIS and QuantumGIS. 

A part of the research is about the time needed to process simple tools (for
exemple: buffer, clip, union, .). ArcGIS has the possibility to watch the
log where you can see how long the program took to process.

I was wondering whether QGIS has the same function. 

I was also wondering whether anyone of the QGIS community already did
comparable research, or has read anything that could help me. 

 

Sincerely,

 

Pieter Stevens

Linking program to master of science in land surveying technology  

 

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Re: [Qgis-user] rule based classification - attribute based on other layer

[Matteo Ghetta]

Hi,
I cannot install the plugin.. I have a missing library (qtsql)...
anyway thanks for clarifying..

Matteo

2015-03-25 19:11 GMT+01:00 Junior Delaz :

> Hello,
> You may give a look to *getFeature* function (combining or not with
> function like *attribute* or spatial ones). There is also *RefFunctions*
> plugin that may help to use values/fields of another layer.
> But unfortunately, there is no list of such layers nor their fields in the
> dialog. You need to write them yourself and their values.
>
> 2015-03-25 18:14 GMT+01:00 Matteo Ghetta :
>
>> Hi all,
>> very simple question.
>> In the rule-based classification (vector) is it possible to use values of
>> another layer loaded in QGIS?
>>
>> For example. Point vector and I want to display as red each feature that
>> has a value greater than a value stored in another point layer (or in a
>> table).
>> In the expression builder there are the fields of the active layer.
>>
>> Is it possible to call the fields of other layers?
>>
>> Thanks
>>
>> Cheers
>>
>> Matteo
>>
>>
>>
>> ___
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>> Qgis-user@lists.osgeo.org
>> http://lists.osgeo.org/mailman/listinfo/qgis-user
>>
>
>
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Re: [Qgis-user] rule based classification - attribute based on other layer

[Matteo Ghetta]

>
> Sounds like you are trying Red if valueA > max(layer B value)?
>

exactly... :)
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Re: [Qgis-user] Plugins are broken

[Etienne Trimaille]

Azizul, in another topic, you said that you are using QGIS 2.0.1.
First, you should upgrade to 2.8.1.

2015-03-26 15:29 GMT+02:00 Paolo Cavallini :

> Il 26/03/2015 14:23, azizul haque ha scritto:
> > Dear QGIS Users,
> > As I sent a message to you all that Processing, QuickOSM and Buffer by
> > percentage plugin are broken. I could not recovery it yet.
>
> Hi Azizul,
> what is the error message?
> All the best.
>
> --
> Paolo Cavallini - www.faunalia.eu
> QGIS & PostGIS courses: http://www.faunalia.eu/training.html
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Re: [Qgis-user] Plugins are broken

[Paolo Cavallini]

Il 26/03/2015 14:23, azizul haque ha scritto:
> Dear QGIS Users,
> As I sent a message to you all that Processing, QuickOSM and Buffer by
> percentage plugin are broken. I could not recovery it yet.

Hi Azizul,
what is the error message?
All the best.

-- 
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[Qgis-user] Plugins are broken

[azizul haque]

Dear QGIS Users,

As I sent a message to you all that Processing, QuickOSM andBuffer by 
percentage plugin are broken. I could not recovery it yet.

Your help are much appreciated

Regards

Azizul


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Re: [Qgis-user] Query expression bugs with NULL Values

[José Carlos Martínez Llario]

Thanks for the answer Jürgen, didnt know that QGIS used normal database 
null logic which is fantastic.

Cheers,
Jose


On 26/03/2015 10:53, Jürgen E. Fischer wrote:

Hi José,

On Thu, 26. Mar 2015 at 10:19:10 +0100, José Carlos Martínez Llario wrote:

"amenity"  <>  'restaurant' returns 37 rows
"amenity"  =  'restaurant'  returns 11 rows

The layers has 48 NULL values, so it means that amenity"  <>
'restaurant' does not take into account the null values.
Hope this is a bug and not the correct behaviour.

It's the correct behaviour.   NULL <> 'restaurant' is NULL, ie. not true.

Use eg. coalesce('amenity','') <> 'restaurant'


Jürgen



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Re: [Qgis-user] Format GETFEATUREINFO request from QGISwebserver

[Alessandro Pasotti]

2015-03-26 11:44 GMT+01:00 Carles Vico Blanco :
> Hi,qgis-users,
>
> in the same way of my last question, about how format the GetFeatureInfo
> request in QGISServer, some people tells me that QGIS Server runs in a
> Mapserver architecture (its true?)
>

Completely false.

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Re: [Qgis-user] Format GETFEATUREINFO request from QGISwebserver

[Carles Vico Blanco]

Hi,qgis-users,

in the same way of my last question, about how format the GetFeatureInfo
request in QGISServer, some people tells me that QGIS Server runs in a
Mapserver architecture (its true?)

If that's true, Mapserver format the getfeatureinfo request with a *.map
file  that includes a TEMPLATE option with HTML styles. This option is
easier (for me I'm not a programmer) than the Python coding solution

Now, my problem is that, when I search in QGISServer, I can not find any
*.map file related about this.

Someone knows where is this *.map file? Or how works QGISServer to call the
mapserver .map file?

Thanks a lot!
Carles Vico

2015-03-20 12:21 GMT+01:00 Alessandro Pasotti :

> 2015-03-20 12:08 GMT+01:00 Carles Vico Blanco :
> > Thank you very much for the reply, but I have a question of your answer.
> > When you say: "The latest release", I understand the QGIS 2.8, that's
> > correct? And then, I need to install the QGIS Server Python plugin on
> QGIS
> > Server, as you say here
> > http://www.itopen.it/qgis-server-python-plugins-ubuntu-setup/ , or It's
> no
> > necessary from the latest release of QGIS Desktop?
> >
> > I'll try it and I tell you my result!
> >
> > Thanks a lot!
> >
>
> The article describe the setup to install the example HelloServer
> plugin and let it run on Ubuntu 14.04 server edition, you might find
> that useful to get started, you can also read the other 2 articles in
> the QGIS section of my website
> http://www.itopen.it/category/gis/qgis/qgis-server/
>
> You need to write a custom filter to modifiy GETFEATUREINFO request,
> if you examine the example plugin's code you will probably get some
> inspiration.
>
> Python plugins for QGIS Server are available with QGIS >= 2.8
>
> One of my tasks for the next HF is to add a "Server" section to the
> plugins official repository, if you develop something re-usable, don't
> forget to upload the plugin when it's done.
>
>
> Happy coding :)
>
> --
> Alessandro Pasotti
> w3:   www.itopen.it
>
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Re: [Qgis-user] Query expression bugs with NULL Values

[Jürgen E . Fischer]

Hi José,

On Thu, 26. Mar 2015 at 10:19:10 +0100, José Carlos Martínez Llario wrote:
> "amenity"  <>  'restaurant' returns 37 rows
> "amenity"  =  'restaurant'  returns 11 rows
> 
> The layers has 48 NULL values, so it means that amenity"  <>
> 'restaurant' does not take into account the null values.
> Hope this is a bug and not the correct behaviour.

It's the correct behaviour.   NULL <> 'restaurant' is NULL, ie. not true.

Use eg. coalesce('amenity','') <> 'restaurant'


Jürgen

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Re: [Qgis-user] Query expression bugs with NULL Values

[José Carlos Martínez Llario]

Sorry I didnt explain well. Forget about the second part of the email, I 
was talking about syntax, of course  is well-known that NULL and 'NULL' 
are two different things but that was not my point):


So this this the problem that I would like an answer:

The table has 4635 rows, which 4587 are null as the following queries prove:

 "amenity" is not NULL  returns 48 rows
 "amenity" is NULL returns  4587 rows


The following queries doest not make sense:

"amenity"  <>  'restaurant' returns 37 rows
"amenity"  =  'restaurant'  returns 11 rows

The layers has 48 NULL values, so it means that amenity"  <> 
'restaurant' does not take into account the null values.

Hope this is a bug and not the correct behaviour.

Im using QGIS 2.8.1





The table has 48 null "amenity" rows and 4587 not null "amenity" rows as 
you can see from the first queries


On 25/03/2015 20:38, Andre Joost wrote:

Am 25.03.2015 um 20:07 schrieb José Carlos Martínez Llario:




The layers has 48 NULL values,



...


THIS IS OK
"amenity" is not NULL returns 48
"amenity" is NULL returns  4587



This does not make nuch sense to me. Do you have 48 empty (NULL) 
entries, or 48 non-empty values?



THIS IS WRONG (if null values can not be treated as a text in the syntax
it shouldnt work in both cases or throw some error)
"amenity" <> 'NULL' returns 48
"amenity"  =  'NULL'  returns 0   


No, NULL and 'NULL' are two different things. It is possible to write 
'NULL' as a text value for amenity (although it does not make sense, 
but the OSM database does not reject it).


So it should be ok that "amenity"  =  'NULL' returns nothing in your 
dataset.


HTH,
André Joost


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[Qgis-user] Qgis android

[daniel pinto]

Good morning!! Could someone please help me i really  need to use the
open layers plugin on my android device in the field and i cant seem to do
it or use bing maps or google for that matter on the background of my
projects please help!!

Best regards
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Re: [Qgis-user] Question Install QGIS 2.8.1 - 64bit while QGIS 2.6.0 32bit still installed

[Andreas Neumann]

Hi Tom,

Plugins should work smoothly between the 32bit and 64bit QGIS version, 
as Python is a scripting language and compiled/recompiled when necessary 
(the pyc versions are the binary versions of the python files). There is 
more problems for plugins when moved between different QGIS versions, 
esp. when there are API differences. You can also use the same 
plugins/python files on other OS (fe. Linux and OSX) if the plugin 
author did not use anything operating system dependent.


Greetings,
Andreas

On 26.03.2015 08:20, Leahy, Thomas A. wrote:


Hello,

  I have been using QGIS 2.6.0 32bit and have just installed QGIS 
2.8.1 64 bit.


  I noticed that the Proxy setting I had for QGIS 2.6.0 32bit show up 
in my QGIS 2.8.1 64bit version


  And

  The Plug-Ins I had in QGIS 2.6.0 32bit show up as already installed 
in my QGIS 2.8.1 64bit version.


  Is there going to be any problems with the Plug-Ins? Is there a 
difference between a Plug-In used by a 32bit version of QGIS vs a 
64bit version?


  Also once I open files in version 2.8.1 will they not be able to be 
used with the 2.6.0 version?


  Thanks for your assistance.

Best Regards,

Tom Leahy



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[Qgis-user] Question Install QGIS 2.8.1 - 64bit while QGIS 2.6.0 32bit still installed

[Leahy, Thomas A.]

Hello,

  I have been using QGIS 2.6.0 32bit and have just installed QGIS 2.8.1 64 bit.
  I noticed that the Proxy setting I had for QGIS 2.6.0 32bit show up in my 
QGIS 2.8.1 64bit version
  And
  The Plug-Ins I had in QGIS 2.6.0 32bit show up as already installed in my 
QGIS 2.8.1 64bit version.

  Is there going to be any problems with the Plug-Ins? Is there a difference 
between a Plug-In used by a 32bit version of QGIS vs a 64bit version?

  Also once I open files in version 2.8.1 will they not be able to be used with 
the 2.6.0 version?

  Thanks for your assistance.

Best Regards,
Tom Leahy
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