Re: [Qgis-user] volume calculations in qgis

[Mars Sjoden]

+1 for GRASS

Hartanto Sanjaya has a nice slide for calculating a basic volume for a lake
using GRASS.

May help if you are unfamiliar with the tools available in GRASS.

http://hartanto.wordpress.com/2007/06/16/analisis-3-dimensi-untuk-volume-air-danau/

mars

On Tue, Nov 15, 2011 at 11:01 AM, Saber Razmjooei  wrote:

> I had this problem in the past. Unfortunately there are not many plugins
> for raster analysis in QGIS and I usually I end up doing in in GRASS.
> The command in GRASS for inspection your raster layers, using polygon
> vectors:
> http://grass.osgeo.org/gdp/html_grass64/v.what.rast.html
>
> You need to run r.null to set the unwanted values to null (i.e. positive
> or negative values).
>
>
> Cheers
> Saber
>
> On Tue, 2011-11-15 at 18:57 +0100, Bernhard Draeyer wrote:
> > I have 2 high resolution raster DEM's before and after a recent flood
> > event. The aim would be to get for different areas a) erosion/negative
> > volumes b) accumulation/positive volumes and net volume.
> >
> > First of all, i subtracted the actual surface from the 'before'-surface
> > to get a difference surface with positive (accumulation) and negative
> > (erosion) values.
> > Then i created a shape layer with polygons of different areas of
> > interest. For each of them i need seperate volumetrics. Ideally, the
> > polygons should contain in the end attribute values for accumulation,
> > erosion and net volumes.
> > Now i was looking without success for a well adapted method to solve my
> > problem in QGIS or SAGA.
> >
> > How should i proceed? Is there any method in QGIS to sum up positive and
> > negative raster values under polygons and put them in seperate attribute
> > fields per polygon? Do i have to convert the raster in a point layer? I
> > saw, that in esri's 3d analyst exist a tin polygon volume function, that
> > covers this task. Does anything similar exist with an os gis?
> >
> >
> > Many thanks for your help.
> >
> > Bernie
> >
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>
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Re: [Qgis-user] Proposed attribute table UI redesign

[Mars Sjoden]

I like:

1. Reduce Margins
2. Split buttons into groups
3. Reduce Min row height (could this be adjustable within a setting of
QGIS?)

Disklike:

"look for" should at least be "Search" or "Search for"

Agree or Suggestion?:
 a simple >magnifying glass search icon< for a "Search" button OR
  - Simply selecting search parameters (or typing) automagically live
searches (possible?)
  - Replace Search Button with an X button to clear search parameters

a simple >magnifying glass search icon with +< for advanced search

Onto a separate topic...

You must know your way around Designer.

I have been trying to figure out if it is possible to create an identity
window that allows direct editing within it.
I have only a couple hours after work to investigate, but between kids and
the need for sleep I don't make much progress! ^_^

Thanks for your UI design remake, It is an improvement, and if searching
can be activated LIVE then I agree a Search Button is really unnecessary.

mars

On Mon, Nov 14, 2011 at 12:54 AM, Nathan Woodrow wrote:

> Hi all,
>
> Today I was looking at some different ways to redesign and optimize the
> attribute table UI and have come up with a design that I think works well
> but would like to get some feedback first.
>
> I have made two screenshots, showing the old and new dialog at the same
> size and using the same Qt theme.
>
> Just a plain comparison screenshot :
> http://dl.dropbox.com/u/6170988/Plain.png
> Comparison screenshot with notes :
> http://dl.dropbox.com/u/6170988/Noted.png
>
> The main things are:
>
>1. Make the min row height to 16.  This removes the empty space below
>the text in the current UI and allows more rows to be shown with less
>wasted space.
>2. Reduce some of the margins around the controls.
>3. Move the search stuff to the top in order to give search text more
>space and group the items better. All search options at the top.
>4. Replace Advanced search button with a hyperlink style button.  This
>is less distracting from a UI point of view IMO.
>5. Remove Search button as Enter on the keyboard does the same thing.
>Is a button really needed?
>6. Split buttons at bottom into two groups.  Actions for current
>selection and stuff that only works in edit mode e.g. adding new column.
>
>  Over all you can show about 4 more rows depending on the theme.  Having
> the search at the top for me feels better as it is less cramped then where
> it is now and makes more sense to click Show Selected Only and seeing the
> results below.
>
> Anyone have any thoughts about the design?
>
> - Nathan
>
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Re: [Qgis-user] graduated symbols for point layers

[Mars Sjoden]

On Mon, Nov 14, 2011 at 8:06 AM, Caroline Rendon <
caroline.t.ren...@gmail.com> wrote:

> Hi Sake,
>
> This doesn't work for me. The symbols still appear in graduated colors,
> all the same size - and the size doesn't seem to change when I change the
> number, although it does between millimeters and map units. I'm sure
> there's just something I'm missing (I'm new to QGIS) but I can't figure it
> out. Thanks for your help!
>
>
 Just a hunch, Maybe?, is the field you chose numerical or text?
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Re: [Qgis-user] Transparency of categorized layers

[David J. Bakeman]

Giovanni Manghi wrote:
   

I'll have to try that out in the Dev version, but in 1.7.1 it is not
possible to select multiple categorized classes,
 

right.

a "workaround" is to use the old symbology, you have the button in the
"style" tab of the vector properties.
   

Or as Brad suggested set the transparency before you categorize.
You do this by clicking on Symbol and setting any common characteristics 
you want like transparency.

Then click OK and then click Classify.

I've only used transparency and setting the borders to NoPen so I can't 
say others work for sure.


By the way I'm using 1.7.1Wroclaw on Fedora 14 linux.

Cheers

-- Giovanni --


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[Qgis-user] Problems

[Guillaume Larocque]

Hi again, this is definitely not my day of luck with QGIS.

I have been working in QGIS doing various things and I started getting
the message below with almost everything I do (add a new layer,
various raster operations, ...), which crashes the function.

Any help would be appreciated. I am teaching a workshop on QGIS
tomorrow and I really need this to work!

Thank you,

Guillaume

An error has occured while executing Python code:

Traceback (most recent call last):
  File "C:/PROGRA~2/QUANTU~1/apps/qgis/./python/plugins\GdalTools\GdalTools.py",
line 278, in doGrid
    self.runToolDialog( d )
  File "C:/PROGRA~2/QUANTU~1/apps/qgis/./python/plugins\GdalTools\GdalTools.py",
line 326, in runToolDialog
    dlg.show_()
  File 
"C:/PROGRA~2/QUANTU~1/apps/qgis/./python/plugins\GdalTools\tools\widgetPluginBase.py",
line 43, in show_
    self.onLayersChanged()
  File 
"C:/PROGRA~2/QUANTU~1/apps/qgis/./python/plugins\GdalTools\tools\doGrid.py",
line 69, in onLayersChanged
    self.inSelector.setLayers(
Utils.LayerRegistry.instance().getVectorLayers() )
  File 
"C:/PROGRA~2/QUANTU~1/apps/qgis/./python/plugins\GdalTools\tools\GdalTools_utils.py",
line 161, in getVectorLayers
    return filter( self.isVector, LayerRegistry.layers )
  File 
"C:/PROGRA~2/QUANTU~1/apps/qgis/./python/plugins\GdalTools\tools\GdalTools_utils.py",
line 156, in isVector
    if layer.usesProvider() and layer.providerKey() != 'ogr':
TypeError: 'sip.methoddescriptor' object is not callable

Python version:
2.5.2 (r252:60911, Feb 21 2008, 13:11:45) [MSC v.1310 32 bit (Intel)]


QGIS version:
1.7.1-Wroclaw Wroclaw, e6718b6

Python path: ['C:/PROGRA~2/QUANTU~1/apps/qgis/./python',
'C:/Users/Guillaume/.qgis/python',
'C:/Users/Guillaume/.qgis/python/plugins',
'C:/PROGRA~2/QUANTU~1/apps/qgis/./python/plugins',
'C:\\PROGRA~2\\QUANTU~1\\bin\\python25.zip',
'C:\\PROGRA~2\\QUANTU~1\\apps\\Python25\\DLLs',
'C:\\PROGRA~2\\QUANTU~1\\apps\\Python25\\lib',
'C:\\PROGRA~2\\QUANTU~1\\apps\\Python25\\lib\\plat-win',
'C:\\PROGRA~2\\QUANTU~1\\apps\\Python25\\lib\\lib-tk',
'C:\\PROGRA~2\\QUANTU~1\\apps\\qgis\\bin',
'C:\\PROGRA~2\\QUANTU~1\\apps\\Python25',
'C:\\PROGRA~2\\QUANTU~1\\apps\\Python25\\lib\\site-packages',
'C:\\PROGRA~2\\QUANTU~1\\apps\\Python25\\lib\\site-packages\\win32',
'C:\\PROGRA~2\\QUANTU~1\\apps\\Python25\\lib\\site-packages\\win32\\lib',
'C:\\PROGRA~2\\QUANTU~1\\apps\\Python25\\lib\\site-packages\\Pythonwin',
'C:\\PROGRA~2\\QUANTU~1\\apps\\Python25\\lib\\site-packages\\wx-2.8-msw-unicode',
'C:\\PROGRA~2\\QUANTU~1\\apps\\qgis\\python\\plugins\\fTools\\tools']
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Re: [Qgis-user] Where to download maps from?

[Carlos Cerdán]

Hi Jim

Diva GIS has also free vector and raster data for all world at 
http://www.diva-gis.org/Data


Regards from Perú

Carlos Cerdán

El 15/11/11 05:50, Jim Brown escribió:
Hi all, I'm a newbie so this question has probably been asked before, 
sorry about that...


When I downloaded Qgis I got the Alaska map. I'd like to do my 
learning on something closer to home which is Johannesburg, South 
Africa. Or failing that, the Eastern Cape as shown in some of the pix 
in Tim /etal'/s//Gentle Introduction.


Can someone point me in the right direction please? For now, your 
explanation will need to be in simple terms with a bit of detail if 
you don't mind ;-)


Btw, anyone in the Qgis world wanting to connect with me, my Linkedin, 
Skype and BBM details are below


Regards,
*Jim Brown*


Click here  to go to my LinkedIn 
page


Skype: jim.brownza
BBM: 23BF2088



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Re: [Qgis-user] volume calculations in qgis

[Saber Razmjooei]

I had this problem in the past. Unfortunately there are not many plugins
for raster analysis in QGIS and I usually I end up doing in in GRASS.
The command in GRASS for inspection your raster layers, using polygon
vectors:
http://grass.osgeo.org/gdp/html_grass64/v.what.rast.html

You need to run r.null to set the unwanted values to null (i.e. positive
or negative values).


Cheers
Saber

On Tue, 2011-11-15 at 18:57 +0100, Bernhard Draeyer wrote:
> I have 2 high resolution raster DEM's before and after a recent flood 
> event. The aim would be to get for different areas a) erosion/negative 
> volumes b) accumulation/positive volumes and net volume.
> 
> First of all, i subtracted the actual surface from the 'before'-surface 
> to get a difference surface with positive (accumulation) and negative 
> (erosion) values.
> Then i created a shape layer with polygons of different areas of 
> interest. For each of them i need seperate volumetrics. Ideally, the 
> polygons should contain in the end attribute values for accumulation, 
> erosion and net volumes.
> Now i was looking without success for a well adapted method to solve my 
> problem in QGIS or SAGA.
> 
> How should i proceed? Is there any method in QGIS to sum up positive and 
> negative raster values under polygons and put them in seperate attribute 
> fields per polygon? Do i have to convert the raster in a point layer? I 
> saw, that in esri's 3d analyst exist a tin polygon volume function, that 
> covers this task. Does anything similar exist with an os gis?
> 
> 
> Many thanks for your help.
> 
> Bernie
> 
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Re: [Qgis-user] Error when launching QGIS

[Giuseppe Sucameli]

Hi António,

what's the GdalTools plugin installed version?

Can you install the latest GdalTools version from the plugins
installer (you have to enable experimental plugins) and then
try again?

Regards.

2011/11/15 António Rocha :
> Sorry
> CentOS
> QGIS1.6.0
>
> 2011/11/15 Giovanni Manghi 
>>
>> Olá Antonio,
>>
>> On Tue, 2011-11-15 at 18:01 +, António Rocha wrote:
>> > Greetings
>> > When I launch QGIS I get the following error:
>> > Loaded : __error__ (package: GdalTools)
>> > But I have GDAL in my system (1.8.0).
>> > And a Panel with a Python error  that starts with:
>> > "Couldn't load plugin GdalTools due an error whern calling its
>> > classFactory() method
>>
>> What Operating system? installer? qgis version?
>>
>> cheers
>>
>> -- Giovanni --
>>
>>
>
>
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-- 
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Re: [Qgis-user] Transparency of categorized layers

[Giovanni Manghi]

> 
> I'll have to try that out in the Dev version, but in 1.7.1 it is not
> possible to select multiple categorized classes,

right.

a "workaround" is to use the old symbology, you have the button in the
"style" tab of the vector properties.

Cheers

-- Giovanni --


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Re: [Qgis-user] Transparency of categorized layers

[Roger André]

Hi Giovanni,

I'll have to try that out in the Dev version, but in 1.7.1 it is not
possible to select multiple categorized classes, nor is there any
transparency option available via right-click (at least none that I can
find).

Thanks,

Roger
--

On Tue, Nov 15, 2011 at 12:00 AM, Giovanni Manghi  wrote:

> Hi,
>
> On Mon, 2011-11-14 at 15:22 -0800, Roger André wrote:
> > Hi All,
> >
> >
> > Is there a way to apply a uniform amount of transparency to every
> > category in a categorized layer?  In other words, to treat the
> > categorized layers as a single group, and apply transparency to the
> > group.
>
>
> I agree that the overall transparency slider is missing form the new
> symbology (graduated and categorized) like we have in the old symbology.
>
> http://hub.qgis.org/issues/2861
>
> In any case at least in the development version of QGIS you can select
> multiple symbology classes, right click the mouse and set the
> transparency of those classes.
>
> cheers
>
> -- Giovanni --
>
>
>
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Re: [Qgis-user] Error when launching QGIS

[António Rocha]

Sorry
CentOS
QGIS1.6.0

2011/11/15 Giovanni Manghi 

> Olá Antonio,
>
> On Tue, 2011-11-15 at 18:01 +, António Rocha wrote:
> > Greetings
> > When I launch QGIS I get the following error:
> > Loaded : __error__ (package: GdalTools)
> > But I have GDAL in my system (1.8.0).
> > And a Panel with a Python error  that starts with:
> > "Couldn't load plugin GdalTools due an error whern calling its
> > classFactory() method
>
> What Operating system? installer? qgis version?
>
> cheers
>
> -- Giovanni --
>
>
>
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Re: [Qgis-user] Error when placing a scale bar in Composer QGIS 1.6.0

[Giovanni Manghi]

On Tue, 2011-11-15 at 18:20 +, António Rocha wrote:
> Hi
> 
> 
> I have done that and it does not change. This is related with a very
> small raster.


is your project in a projected or geographic CRS?

cheers

-- Giovanni --

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Re: [Qgis-user] Error when placing a scale bar in Composer QGIS 1.6.0

[António Rocha]

Hi

I have done that and it does not change. This is related with a very small
raster.

2011/11/15 Giovanni Manghi 

> Olá,
>
> On Tue, 2011-11-15 at 17:56 +, António Rocha wrote:
> > Hi
> >
> >
> > In some cases, when I try to add a scale bar to the Composer I get a
> > box with:
> > 0
> > |
>
> seems normal to me, you'll have to set the "segment size" and "maps unit
> per bar unit" in the scalebar properties ("item" tab in the composer).
>
> cheers
>
> -- Giovanni --
>
>
>
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Re: [Qgis-user] Error when placing a scale bar in Composer QGIS 1.6.0

[Giovanni Manghi]

Olá,

On Tue, 2011-11-15 at 17:56 +, António Rocha wrote:
> Hi
> 
> 
> In some cases, when I try to add a scale bar to the Composer I get a
> box with:
> 0
> | 

seems normal to me, you'll have to set the "segment size" and "maps unit
per bar unit" in the scalebar properties ("item" tab in the composer).

cheers

-- Giovanni --


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Re: [Qgis-user] Error when launching QGIS

[Giovanni Manghi]

Olá Antonio,

On Tue, 2011-11-15 at 18:01 +, António Rocha wrote:
> Greetings
> When I launch QGIS I get the following error:
> Loaded : __error__ (package: GdalTools)
> But I have GDAL in my system (1.8.0).
> And a Panel with a Python error  that starts with:
> "Couldn't load plugin GdalTools due an error whern calling its
> classFactory() method

What Operating system? installer? qgis version?

cheers

-- Giovanni --


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Re: [Qgis-user] ManageR under Windows.

[Giovanni Manghi]

Hi, you have to add the path of the /bin folder in your R installation
in the "path" environment variable of Windows. Due to the afct that the
rpy2 library (the "bridge" between python and R) for Windows is not
updated you must use R <= 2.11

In the QGIS wiki you can find detailed instructions.

Cheers

-- Giovanni --

On Tue, 2011-11-15 at 13:03 -0500, Guillaume Larocque wrote:
> Hi, I am trying to run ManageR under Windows 7. I have installed QGIS
> with the Standalone installer and I also tried the OSGeo4W installer.
> I get the error message found below. I have tried to set the R_HOME
> environmental variable in Windows to different values
> (/bin,/i386,/x64, etc) and I always get this message. 
> 
> 
> Any help is appreciated, 
> 
> 
> Thank you, 
> 
> 
> Guillaume 
> 
> 
> An error has occured while executing Python code:
> 
> Traceback (most recent call last):
>   File "C:/Users/Guillaume/.qgis/python/plugins\manageR\plugin.py",
> line 58, in run
> from manageR import MainWindow, loadConfig, saveConfig
>   File "C:/OSGeo4W/apps/qgis/./python\qgis\utils.py", line 283, in
> _import
> mod = _builtin_import(name, globals, locals, fromlist, level)
>   File "C:/Users/Guillaume/.qgis/python/plugins\manageR\manageR.py",
> line 68, in 
> import rpy2.robjects as robjects
>   File "C:/OSGeo4W/apps/qgis/./python\qgis\utils.py", line 283, in
> _import
> mod = _builtin_import(name, globals, locals, fromlist, level)
>   File "C:\OSGeo4W\apps\Python25\lib\site-packages\rpy2\robjects
> \__init__.py", line 12, in 
> import rpy2.rinterface as rinterface
>   File "C:/OSGeo4W/apps/qgis/./python\qgis\utils.py", line 283, in
> _import
> mod = _builtin_import(name, globals, locals, fromlist, level)
>   File "C:\OSGeo4W\apps\Python25\lib\site-packages\rpy2\rinterface
> \__init__.py", line 52, in 
> raise RuntimeError("Unable to locate R.dll within %s" % R_HOME)
> RuntimeError: Unable to locate R.dll within C:\Progra~1\R\R-2.12.1\bin
> \i386
> 
> Python version:
> 2.5.1 (r251:54863, Apr 18 2007, 08:51:08) [MSC v.1310 32 bit (Intel)]
> 
> 
> QGIS version:
> 1.7.1-Wroclaw Wroclaw, e6718b6
> 
> Python path: ['C:/OSGeo4W/apps/qgis/./python',
> 'C:/Users/Guillaume/.qgis/python',
> 'C:/Users/Guillaume/.qgis/python/plugins',
> 'C:/OSGeo4W/apps/qgis/./python/plugins', 'C:\\Windows\\system32\
> \python25.zip', 'C:\\OSGeo4W\\apps\\Python25\\DLLs', 'C:\\OSGeo4W\
> \apps\\Python25\\lib', 'C:\\OSGeo4W\\apps\\Python25\\lib\\plat-win',
> 'C:\\OSGeo4W\\apps\\Python25\\lib\\lib-tk', 'C:\\OSGeo4W\\apps\\qgis\
> \bin', 'C:\\OSGeo4W\\apps\\Python25', 'C:\\OSGeo4W\\apps\\Python25\
> \lib\\site-packages', 'C:\\OSGeo4W\\apps\\Python25\\lib\\site-packages
> \\win32', 'C:\\OSGeo4W\\apps\\Python25\\lib\\site-packages\\win32\
> \lib', 'C:\\OSGeo4W\\apps\\Python25\\lib\\site-packages\\Pythonwin',
> 'C:\\OSGeo4W\\apps\\Python25\\lib\\site-packages\\wx-2.8-msw-unicode',
> '/usr/share/qgis/python', 'C:\\OSGeo4W\\apps\\qgis\\python\\plugins\
> \fTools\\tools']
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[Qgis-user] ManageR under Windows.

[Guillaume Larocque]

Hi, I am trying to run ManageR under Windows 7. I have installed QGIS with
the Standalone installer and I also tried the OSGeo4W installer. I get the
error message found below. I have tried to set the R_HOME environmental
variable in Windows to different values (/bin,/i386,/x64, etc) and I always
get this message.

Any help is appreciated,

Thank you,

Guillaume

An error has occured while executing Python code:

Traceback (most recent call last):
  File "C:/Users/Guillaume/.qgis/python/plugins\manageR\plugin.py", line
58, in run
from manageR import MainWindow, loadConfig, saveConfig
  File "C:/OSGeo4W/apps/qgis/./python\qgis\utils.py", line 283, in _import
mod = _builtin_import(name, globals, locals, fromlist, level)
  File "C:/Users/Guillaume/.qgis/python/plugins\manageR\manageR.py", line
68, in
import rpy2.robjects as robjects
  File "C:/OSGeo4W/apps/qgis/./python\qgis\utils.py", line 283, in _import
mod = _builtin_import(name, globals, locals, fromlist, level)
  File
"C:\OSGeo4W\apps\Python25\lib\site-packages\rpy2\robjects\__init__.py",
line 12, in
import rpy2.rinterface as rinterface
  File "C:/OSGeo4W/apps/qgis/./python\qgis\utils.py", line 283, in _import
mod = _builtin_import(name, globals, locals, fromlist, level)
  File
"C:\OSGeo4W\apps\Python25\lib\site-packages\rpy2\rinterface\__init__.py",
line 52, in
raise RuntimeError("Unable to locate R.dll within %s" % R_HOME)
RuntimeError: Unable to locate R.dll within C:\Progra~1\R\R-2.12.1\bin\i386

Python version:
2.5.1 (r251:54863, Apr 18 2007, 08:51:08) [MSC v.1310 32 bit (Intel)]


QGIS version:
1.7.1-Wroclaw Wroclaw, e6718b6

Python path: ['C:/OSGeo4W/apps/qgis/./python',
'C:/Users/Guillaume/.qgis/python',
'C:/Users/Guillaume/.qgis/python/plugins',
'C:/OSGeo4W/apps/qgis/./python/plugins',
'C:\\Windows\\system32\\python25.zip', 'C:\\OSGeo4W\\apps\\Python25\\DLLs',
'C:\\OSGeo4W\\apps\\Python25\\lib',
'C:\\OSGeo4W\\apps\\Python25\\lib\\plat-win',
'C:\\OSGeo4W\\apps\\Python25\\lib\\lib-tk', 'C:\\OSGeo4W\\apps\\qgis\\bin',
'C:\\OSGeo4W\\apps\\Python25',
'C:\\OSGeo4W\\apps\\Python25\\lib\\site-packages',
'C:\\OSGeo4W\\apps\\Python25\\lib\\site-packages\\win32',
'C:\\OSGeo4W\\apps\\Python25\\lib\\site-packages\\win32\\lib',
'C:\\OSGeo4W\\apps\\Python25\\lib\\site-packages\\Pythonwin',
'C:\\OSGeo4W\\apps\\Python25\\lib\\site-packages\\wx-2.8-msw-unicode',
'/usr/share/qgis/python',
'C:\\OSGeo4W\\apps\\qgis\\python\\plugins\\fTools\\tools']
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[Qgis-user] Error when launching QGIS

[António Rocha]

Greetings
When I launch QGIS I get the following error:
Loaded : __error__ (package: GdalTools)
But I have GDAL in my system (1.8.0).
And a Panel with a Python error  that starts with:
"Couldn't load plugin GdalTools due an error whern calling its
classFactory() method

Any tip on this?
Thanks
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[Qgis-user] volume calculations in qgis

[Bernhard Draeyer]

I have 2 high resolution raster DEM's before and after a recent flood 
event. The aim would be to get for different areas a) erosion/negative 
volumes b) accumulation/positive volumes and net volume.


First of all, i subtracted the actual surface from the 'before'-surface 
to get a difference surface with positive (accumulation) and negative 
(erosion) values.
Then i created a shape layer with polygons of different areas of 
interest. For each of them i need seperate volumetrics. Ideally, the 
polygons should contain in the end attribute values for accumulation, 
erosion and net volumes.
Now i was looking without success for a well adapted method to solve my 
problem in QGIS or SAGA.


How should i proceed? Is there any method in QGIS to sum up positive and 
negative raster values under polygons and put them in seperate attribute 
fields per polygon? Do i have to convert the raster in a point layer? I 
saw, that in esri's 3d analyst exist a tin polygon volume function, that 
covers this task. Does anything similar exist with an os gis?



Many thanks for your help.

Bernie

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[Qgis-user] Error when placing a scale bar in Composer QGIS 1.6.0

[António Rocha]

Hi

In some cases, when I try to add a scale bar to the Composer I get a box
with:
0
|

If I try to change the units I get the following in my command-window:
Warning: Object::disconnected: Unexpected null parameter

Any tips on this?

Thanks
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Re: [Qgis-user] education resources

[Advrk Aplmrkt]

On 15 November 2011 05:52, Anne Ghisla  wrote:
> On Tue, 15 Nov 2011 09:15:33 +1100
> Noli Sicad  wrote:
>
>> This is the latest material for QGIS Workshop’s documentation (FOSS4G
>> -Denver)
>>
>> http://sourcepole.com/foss4g/index.html
>>
>> I hope this will help start you and probably you can improve by
>> incorporating your own data.
>
> Hello Eelke, all,
>
> on OSGeo side there is a central repository for educational material
> called ELOGeo:
>
> http://elogeo.nottingham.ac.uk/xmlui
>
> and also the older, richer OSGeo catalog of educational material:
>
> http://www.osgeo.org/educational_content
>
> that led me to a QGIS+GRASS+R course from University Davis that can be
> close to what you are looking for: http://www.osgeo.org/node/886
>
> I suggest to everyone who wants to share tutorials and course materials
> to add the links to these two repositories. More information on OSGeo
> educational activities is available here:
> http://wiki.osgeo.org/wiki/Education_and_Curriculum_Committee
>
> Eelke, all the best for your course!
> Anne
>
>>
>> Noli
>>
>> On 11/15/11, Advrk Aplmrkt  wrote:
>> > On 14 November 2011 03:12, Eelke Folmer 
>> > wrote:
>> >> Hi,
>> >> I am going to teach a two week basic GIS course (with QGIS and R)
>> >> to conservation ecologists/ornithologists in Nigeria. Skills that
>> >> I expect the
>> >> students to learn are amongst others: mapping of habitat,
>> >> organisms, roads,
>> >> rivers with GPS (and to get data into GIS), analyse DEMs &
>> >> rainfall raster data, make use of satellite imagery and do basic
>> >> analysis on basis of the combination of data obtained. Stuff like
>> >> that.
>> >>
>> >> I am looking for (free) resources that could help me to be as
>> >> effective as possible. I'd appriciate to hear about other people's
>> >> experience; find slides and texts for the students to read.
>> >>
> --
> http://gis.cri.fmach.it/ghisla/
Thanks for all the links to the resources!
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[Qgis-user] is it possible to reverse geocode a file of points using qgis and openstreetmap?

[M . E . Dodd]

I see there are various openstreetmap services such as nominatum/mapquest but 
don't really understand how these might interact with qgis or if it would be a 
separate operation outside of qgis.  Would be much nicer inside qgis so you 
could easily set up table to get the different bits of reverse geocoded 
information on address.  Possibly also have a way of feeding back to 
openstreetmap via qgis directly e.g. sending in map or gps traces etc.


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charity in England & Wales and a charity registered in Scotland (SC 038302).
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RE: [Qgis-user] Simplify?

[Chris Green]

Hi Roger

 

Thanks for your comments. Much appreciated!

 

 

Chris

 

From: Roger André [mailto:ran...@gmail.com] 
Sent: 14 November 2011 21:50
To: Chris Green
Cc: t...@wildintellect.com; qgis-user@lists.osgeo.org
Subject: Re: [Qgis-user] Simplify?

 

GRASS has some very good line simplification options which I believe can be 
accessed from within QGis.  I like to run a light Douglas Peucker 
simplification to cut the vertice count down without dramatically altering the 
appearance of the data, followed by Lang simplification to generalize the 
appearance of things.  A good description of the difference between these 
algorithms can be found at http://psimpl.sourceforge.net/douglas-peucker.html 
and http://psimpl.sourceforge.net/lang.html.

 

BTW, using a vary small threshold tolerance with Douglas Peucker is a great way 
to remove vertices in a straight-line segments.  For example, running a 
tolerance of .0015 on a set of fairly complex world country borders in GRASS 
yields the following for me:

 

 Number of vertices was reduced from 606998 to 230824

 

This pruning is not discernible against the original data set until about 
1.25 map scale.  At 1:5 it starts to look a little blocky.

 

MapShaper is a great tool, and by doing a pruning of your excess vertices as 
metioned above, it might put the data under the 80 MB limit and allow you to 
use it.

 

Roger

--

 

 

On Mon, Nov 14, 2011 at 1:40 AM, Chris Green  wrote:

Hi Alex

Thanks for your response. I have tried Mapshaper on smaller shp files, it is 
pretty good but it has a limit of 80M and some of my files are too large for 
this.

I would still very much like to get the Simplify function working. I assume 
from your comments that in general the QGIS Simplify function works fine so 
either I am doing something wrong, or there is a problem with my local copy of 
QGIS which I could resolve be re-installing?

By the way I can't find the DPSimplify plugin, any idea where I might find it?


Chris


-Original Message-
From: qgis-user-boun...@lists.osgeo.org 
[mailto:qgis-user-boun...@lists.osgeo.org] On Behalf Of Alex Mandel
Sent: 11 November 2011 20:27
To: qgis-user@lists.osgeo.org
Subject: Re: [Qgis-user] Simplify?

I see at least 3 tools in QGIS to do simply.
The one you mentioned in the vector menu (part of ftools)
The DPSimplify plugin (appears to be the precursor to the above tool)
and the Simply function in the vector editor

Of those the last one is the one I've used the most but operates on
individual features at a time. The key question I can see for all of
them though is what tolerance are you setting and what projection is
your data in since this determines the units for tolerance.

I just tested with a tolerance of 1 on a GCS Lat/Lon WGS84 dataset of
lines and it seemed to work fine, I imagine if I had left the tolerance
at 0.0001 it would have done nothing.

Worst case scenario mapshaper is an online tool just for this.

Enjoy,
Alex


On 11/11/2011 05:39 AM, Chris Green wrote:
> Hi Ramon
>
>
>
> I have been trying to modify the original shape file rather than save to a 
> new file. When I tried selecting the ‘save to a new file’ option , the 
> message after simplification said
>
>
>
> ‘There were 3638321 vertices in original dataset which were reduced to 
> 3638321 vertices after simplification’
>
>
>
> In other words, no simplification at all. I suspect that this is actually 
> what is happening when I try to over-write the existing file – it indicates 
> that simplification took place but actually what is saved is identical to the 
> original.
>
>
>
> Thanks anyway…..
>
>
>
>
>
> Chris
>
>
>
> From: qgis-user-boun...@lists.osgeo.org 
> [mailto:qgis-user-boun...@lists.osgeo.org] On Behalf Of Ramon Andiñach
> Sent: 11 November 2011 13:19
> To: 
> Subject: Re: [Qgis-user] Simplify?
>
>
>
>
>
> On 11/11/2011, at 20:40, "Chris Green"  wrote:
>
> Hello
>
>
>
> I am using QGIS 1.7 in a Windows 7 environment. Everything seems great except 
> for the simplify function (Vector->Geometry Tools->Simplify Geometries)
>
>
>
> I am trying to simplify an ESRI shape file which is around 95M. I have tried 
> various tolerance settings, but although it looks like some simplification is 
> taking place, actually the file is unchanged. So for example with tolerance 
> setting of 1.0 I get an encouraging message that says:
>
>
>
> ‘There were 3638321 vertices in original dataset which were reduced to 559351 
> vertices after simplification’
>
>
>
> However after saving the changes to the layer, the dataset still looks 
> identical to the un-simplified version and the file size remains unchanged at 
> 95M. I have tried to simplify smaller shape files also, but with the same 
> result.
>
>
>
> Can someone tell me what I am I doing wrong?
>
>
>
>
>
> Hi Chris,
>
> This is a guess...
>
>
>
> I suppose your output file is different to your input file?
>
>
>
> (otherwise windows will probably get confused)
>
>
>
> -ramon.
>


_

Re: [Qgis-user] Proposed attribute table UI redesign

[Ivan Mincik]

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1

On 11/14/2011 10:15 PM, Alister Hood wrote:
> Hi Ivan,
> What version are you using?
> It works for me in current trunk... well, almost.  The only case where
> it doesn't update is when I deselect features by ctrl-clicking on rows
> in the attribute table.
> Note: if this _is_ fixed then #2065 can be closed.

I am using 1.7.1 on Debian Squeeze Linux.
It works when selecting features by clicking to map, but does not work
with 'search' button in attribute table (which also selects features in map)


- -- 
Ivan Mincik, Gista s.r.o.
-BEGIN PGP SIGNATURE-
Version: GnuPG v1.4.10 (GNU/Linux)

iEYEARECAAYFAk7CV/oACgkQVqso/9cUsCzL5QCeIVeFIu0dhR3fwOzTHYAFLHis
pWoAmQG5/dWOI91kbQugo9ipI2BZYc2d
=Kk7l
-END PGP SIGNATURE-
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Re: [Qgis-user] Voronoi polygon errors

[Carson Farmer]

Hi Morten,
> Using the fTools plugin and using transparency in the symbology shows this:
> http://osgeo-org.1803224.n2.nabble.com/file/n6995908/fTools_Voronoi.png
>
> Doing the same using MMQgis Voronoi show this:
> http://osgeo-org.1803224.n2.nabble.com/file/n6995908/Voronoi.png
>
> fTools add some directly wrong polygons while MMQgis just doubles up some of
> the polygons
Yes, I have found similar problems recently, unfortunately, I haven't
had the time to fix them yet. The module that we use to calculate the
tessellation is not ideal, and as soon as it makes its way into GEOS,
I'd like to use the JTS voronoi polygons solution in QGIS. Please file
a ticket in the bug tracker for now, and I'll see if I can work out a
workaround. In the mean time, if someone else can get to this sooner,
feel free to submit a patch as well!

Cheers,

Carson

-- 
Carson J. Q. Farmer
National Centre for Geocomputation
National University of Ireland, Maynooth,
http://www.carsonfarmer.com/
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Re: [Qgis-user] Problems with Manage R plugin

[Anne Ghisla]

On Thu, 10 Nov 2011 22:28:45 -0200
José Carlos Guerrero Antúnez  wrote:
> Hi,
> 
> I have the following error with the Manage R plugin.
> 
> Traceback (most recent call last):
>   File "/Users/joseca/.qgis//python/plugins/manageR/plugin.py", line
> 58, in run
> from manageR import MainWindow, loadConfig, saveConfig
[...]
> "/Library/Python/2.6/site-packages/rpy2-2.2.2dev_20110918-py2.6-macosx-10.6-universal.egg/rpy2/rinterface/__init__.py",
> line 7, in
> R_HOME = tmp.readlines()
> IOError: [Errno 4] Interrupted system call
> 
> Python version:
> 2.6.1 (r261:67515, Jun 24 2010, 21:47:49)
> [GCC 4.2.1 (Apple Inc. build 5646)]
> 
> 
> QGIS version:
> 1.7.1-Wroclaw Wroclaw,

[...]
 
> Many thanks in advance,

Hello José,

this error has happened some times before, and has been reported as
quite difficult to isolate: 
http://osgeo-org.1803224.n2.nabble.com/Fwd-Hello-td3267307.html

More hits in Google lead to qgis mailing lists.

This is a more detailed analysis on the specific Python error:
http://bytes.com/topic/python/answers/598332-ioerror-errno-4-interrupted-system-call

I'm sorry I don't have a solution ready, so I hope that adding
information to this issue will help developers (of rpy2, if I get it
right) to fix it. Of course anyone willing to provide a patch is
welcomed to propose it to rpy2 developers.

Thanks for understanding, and I hope it will be fixed asap!
In the meanwhile a virtual machine with Linux is probably the quickest
and less-effort workaround.

Anne
-- 
http://gis.cri.fmach.it/ghisla/


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[Qgis-user] New Symbology: reversed nomenclature?

[Agustin Lobo]

In the New Symbology, is not what is named "Categorized" actually
Graduated and what is called "Graduated" actually Categorized?
Under "Graduated" the user must classify into n classes, which is
making n categories, while under what is named "Categorized"
the user gets a continuous color bar.

Agus
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[Qgis-user] Voronoi polygon errors

[magerlin]

Two QGis plugins can create Voronoi Polygons but both seems the have errors?

Using the fTools plugin and using transparency in the symbology shows this:
http://osgeo-org.1803224.n2.nabble.com/file/n6995908/fTools_Voronoi.png 

Doing the same using MMQgis Voronoi show this:
http://osgeo-org.1803224.n2.nabble.com/file/n6995908/Voronoi.png  

fTools add some directly wrong polygons while MMQgis just doubles up some of
the polygons

The point layer can be downloaded here if anybody wants to do their own
tests:
http://dl.dropbox.com/u/8189384/test.zip
http://dl.dropbox.com/u/8189384/test.zip 

-
Regards Morten

(Qgis 1.7.1 and Win 7)
--
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Re: [Qgis-user] Where to download maps from?

[adams]

Dear Jim,

probably the OSM files for South Africa are a good point to start. Get
them here:

http://download.geofabrik.de/osm/africa/south_africa_and_lesotho.shp.zip

Regards, Till

On 15.11.2011 11:50, Jim Brown wrote:
> Hi all, I'm a newbie so this question has probably been asked before,
> sorry about that...
> 
> When I downloaded Qgis I got the Alaska map. I'd like to do my learning
> on something closer to home which is Johannesburg, South Africa. Or
> failing that, the Eastern Cape as shown in some of the pix in Tim
> /etal'/s//Gentle Introduction.
> 
> Can someone point me in the right direction please? For now, your
> explanation will need to be in simple terms with a bit of detail if you
> don't mind ;-)
> 
> Btw, anyone in the Qgis world wanting to connect with me, my Linkedin,
> Skype and BBM details are below
> 
> Regards,
>  
> *Jim Brown *
> 
> 
> Click here  to go to my LinkedIn page
> 
> Skype: jim.brownza
> BBM: 23BF2088
> 
> 
> 
> 
> ___
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-
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Geschaeftsfuehrung

Tel:+49 (0)228 / 962 899-52
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ad...@terrestris.de
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vertreten durch:
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Re: [Qgis-user] Where to download maps from?

[Noli Sicad]

http://www.naturalearthdata.com/blog/natural-earth-version-1-3-release-notes/

Noli

On 11/15/11, Jim Brown  wrote:
> Hi all, I'm a newbie so this question has probably been asked before, sorry
> about that...
>
> When I downloaded Qgis I got the Alaska map. I'd like to do my learning on
> something closer to home which is Johannesburg, South Africa. Or failing
> that, the Eastern Cape as shown in some of the pix in Tim *etal'*s* *Gentle
> Introduction.
>
> Can someone point me in the right direction please? For now, your
> explanation will need to be in simple terms with a bit of detail if you
> don't mind ;-)
>
> Btw, anyone in the Qgis world wanting to connect with me, my Linkedin,
> Skype and BBM details are below
>
> Regards,
>
> *Jim Brown*
>
>
> Click here  to go to my LinkedIn page
>
> Skype: jim.brownza
> BBM: 23BF2088
>
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Re: [Qgis-user] Where to download maps from?

[Jean-Claude Repetto]

Le 15/11/2011 11:50, Jim Brown a écrit :

Hi all, I'm a newbie so this question has probably been asked before,
sorry about that...

When I downloaded Qgis I got the Alaska map. I'd like to do my learning
on something closer to home which is Johannesburg, South Africa. Or
failing that, the Eastern Cape as shown in some of the pix in Tim
/etal'/s//Gentle Introduction.


Hi,

There are some maps available at:
http://www.madmappers.com/browse.php?TY=R&CO=za

Jean-Claude
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[Qgis-user] Re: Snap points to nearest line

[magerlin]

Cameron Munro wrote:
> 
> Hi,
> 
> I have two layers - points and lines. I'd like to snap the points to the
> nearest line and take the attributes of that line. Is this possible within
> QGIS?
> 
> Thanks,
> 
> Cameron.
> 

Hi Cameron

Two suggestions, but not an excact solution:

You can use the mmqgis plugin and select "Hub Distance". With this you can
transfer an attribute (or an ID and then use a join afterwards) to a
pointlayer from the nearest line in a linelayer.

But be aware that "nearest" line will be based only on a "centre point" for
the line and if your lines are very curved or of varying lengths you may not
get the expected result.

You might use the "Vector-Geometry Tools-Extract Nodes" to convert your line
layer to a point layer and use this point layer as the Hublayer instead of
the line layer.

Anybody knows an excact method?




-
Regards Morten

(Qgis 1.7.1 and Win 7)
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[Qgis-user] Where to download maps from?

[Jim Brown]

Hi all, I'm a newbie so this question has probably been asked before, sorry
about that...

When I downloaded Qgis I got the Alaska map. I'd like to do my learning on
something closer to home which is Johannesburg, South Africa. Or failing
that, the Eastern Cape as shown in some of the pix in Tim *etal'*s* *Gentle
Introduction.

Can someone point me in the right direction please? For now, your
explanation will need to be in simple terms with a bit of detail if you
don't mind ;-)

Btw, anyone in the Qgis world wanting to connect with me, my Linkedin,
Skype and BBM details are below

Regards,

*Jim Brown*


Click here  to go to my LinkedIn page

Skype: jim.brownza
BBM: 23BF2088
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Re: [Qgis-user] education resources

[Anne Ghisla]

On Tue, 15 Nov 2011 09:15:33 +1100
Noli Sicad  wrote:

> This is the latest material for QGIS Workshop’s documentation (FOSS4G
> -Denver)
> 
> http://sourcepole.com/foss4g/index.html
> 
> I hope this will help start you and probably you can improve by
> incorporating your own data.

Hello Eelke, all,

on OSGeo side there is a central repository for educational material
called ELOGeo:

http://elogeo.nottingham.ac.uk/xmlui

and also the older, richer OSGeo catalog of educational material:

http://www.osgeo.org/educational_content

that led me to a QGIS+GRASS+R course from University Davis that can be
close to what you are looking for: http://www.osgeo.org/node/886

I suggest to everyone who wants to share tutorials and course materials
to add the links to these two repositories. More information on OSGeo
educational activities is available here:
http://wiki.osgeo.org/wiki/Education_and_Curriculum_Committee

Eelke, all the best for your course!
Anne

> 
> Noli
> 
> On 11/15/11, Advrk Aplmrkt  wrote:
> > On 14 November 2011 03:12, Eelke Folmer 
> > wrote:
> >> Hi,
> >> I am going to teach a two week basic GIS course (with QGIS and R)
> >> to conservation ecologists/ornithologists in Nigeria. Skills that
> >> I expect the
> >> students to learn are amongst others: mapping of habitat,
> >> organisms, roads,
> >> rivers with GPS (and to get data into GIS), analyse DEMs &
> >> rainfall raster data, make use of satellite imagery and do basic
> >> analysis on basis of the combination of data obtained. Stuff like
> >> that.
> >>
> >> I am looking for (free) resources that could help me to be as
> >> effective as possible. I'd appriciate to hear about other people's
> >> experience; find slides and texts for the students to read.
> >>
-- 
http://gis.cri.fmach.it/ghisla/


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Re: [Qgis-user] Snap points to nearest line

[Nicklas Avén]

Hallo

If you have your data stored in PostGIS you can do it directly in the
database.

To get a new table with the snapped points and the line attribudes you
can run:

CREATE TABLE line_attribute_point AS
SELECT distinct on (linetable.id) linetable.*,
ST_ClosestPoint(linetable.geom, pointtable.geom) as snapped_point 
FROM
linetable,pointtable
ORDER BY ST_Distance(linetable.geom, pointtable.geom);

Something like that. 

But this will be slow if you have many points and polygons. Then you can
use ST_Dwithin to speed it up if you know how far away the line and
point can be that should be snapped. Say you don't want to snap longer
than 100 meters then:

CREATE TABLE line_attribute_point AS
SELECT distinct on (linetable.id) linetable.*,
ST_ClosestPoint(linetable.geom, pointtable.geom) as snapped_point 
FROM
linetable INNER JOIN pointtable on ST_Dwithin(linetable.geom,
pointtable.geom, 100)
ORDER BY ST_Distance(linetable.geom, pointtable.geom);

Something like that.


HTH
Nicklas








On Tue, 2011-11-15 at 10:49 +0100, Andreas Neumann wrote:
> Hi Cameron,
> 
>  Snapping works fine, but automatically getting the attributes from an 
>  object it snaps to is not possible.
> 
>  Andreas
> 
>  On Mon, 14 Nov 2011 17:59:58 -0800 (PST), Cameron Munro wrote:
> > Hi,
> >
> > I have two layers - points and lines. I'd like to snap the points to
> > the nearest line and take the attributes of that line. Is this
> > possible within QGIS?
> >
> > Thanks,
> >
> > Cameron.
> 


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Re: [Qgis-user] Snap points to nearest line

[Andreas Neumann]

To automatically get the attributes from an object, in my view, only
using PostgreSQL/PostGIS with triggers.


yes - this would work, but the drawback is that the triggers are only 
triggered on saving the data and not when the snapping happens ... 
Saving in QGIS only happens manually after a user clicked on the save 
button or leaves the edit sesssion.


It would be nice to have the option of immediate saves to PostgreSQL 
for each edit of any single record, for such purposes.


Andreas

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Re: [Qgis-user] Snap points to nearest line

[Pedro Venâncio]

Hi,

To automatically get the attributes from an object, in my view, only using 
PostgreSQL/PostGIS with triggers.

Best regards,

Pedro Venâncio





- Original Message -
From: Andreas Neumann 

Hi Cameron,

Snapping works fine, but automatically getting the attributes from an object it 
snaps to is not possible.

Andreas

On Mon, 14 Nov 2011 17:59:58 -0800 (PST), Cameron Munro wrote:
> Hi,
> 
> I have two layers - points and lines. I'd like to snap the points to
> the nearest line and take the attributes of that line. Is this
> possible within QGIS?
> 
> Thanks,
> 
> Cameron.

-- --
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Switzerland
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Re: [Qgis-user] Snap points to nearest line

[Andreas Neumann]

Hi Cameron,

Snapping works fine, but automatically getting the attributes from an 
object it snaps to is not possible.


Andreas

On Mon, 14 Nov 2011 17:59:58 -0800 (PST), Cameron Munro wrote:

Hi,

I have two layers - points and lines. I'd like to snap the points to
the nearest line and take the attributes of that line. Is this
possible within QGIS?

Thanks,

Cameron.


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Re: [Qgis-user] suscription Pierre Bertieaux

[Yves Jacolin]

Hi,

You can edit your parameter (name, option and email) with the user interface 
of mailman. Don't need to subscribe and unsubscribe!

Y.
Le mardi 15 novembre 2011 08:47:21, Werner Macho a écrit :
> Hi Pierre,
> 
> I assume you are talking about the Qgis-user mailing list ..
> So all in all you could do it by yourself ..
> Just subscribe at [1] with your new mailaddress and unsubscribe the old
> one ..
> 
> I am not sure if one can just change the email address..
> 
> regards
> Werner
> 
> [1] http://lists.osgeo.org/mailman/listinfo/qgis-user
> 
> Am 15.11.2011 08:11, schrieb Pierre BERTIEAUX:
> > Hi,
> > 
> > I would like to change my E-mail adress from
> > pierre.bertie...@corawood.com to pierrefrancoisbertie...@yahoo.fr.
> > 
> > cdt,
> > 
> > PFB
> > 
> > 
> > ___
> > Qgis-user mailing list
> > Qgis-user@lists.osgeo.org
> > http://lists.osgeo.org/mailman/listinfo/qgis-user
> 
> ___
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Re: [Qgis-user] group symbology layers

[Andreas Neumann]

Yes - a grouping feature is missing. But it can be emulated in the new 
symbology with the rule-based renderer by using a rule with a 
IN('cat1','cat2',...) operator.


Andreas

On Tue, 15 Nov 2011 08:10:37 +, Giovanni Manghi wrote:

Hi,


In the layer properties, tab Style: Is it possible to use 
'categorized'
as a style, and then group certain categories? I tried right 
clicking
the categories that I want to group (searching for the group option 
like
in ArcGis), nothing there, and didn't find it in the manual either. 
Did
I overlook it? I've now given the categories that I would've liked 
to
group the same symbol, but then they still appear individually in 
the

legend.


we had the same feature (if I understand well) in the old symbology, 
but

not yet in the new one

http://hub.qgis.org/issues/3275


cheers

-- Giovanni --

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Re: [Qgis-user] PyQGIS can't load - QGIS 1.7 loading error obtained after upgrade linux/ubuntu from distribution 11.04 to 11.10

[Yves Jacolin]

Bonjour Florent,

check that all package have been uptaded correctly, specially the one named 
python-qgis. Check also that all previous package have been removed. You can 
also try ldconfig command on root to update path db to your lib.

Y.

Le samedi 12 novembre 2011 19:22:58, Florent Beck a écrit :
> Hello,
> 
> I am using QGIS for a while and have being more or less lucky with bug
> issues, but this time I don't understand alone how to fix it.
> I was using QGIS 1.7 since its release under Linux/Ubuntu 11.04, now
> that I have just upgraded to the new distribution of Ubuntu (11.10), I
> get the following error message while QGIS loads, and after it has
> finished loading, I can't access the plugin installer (only plugin
> manager and already installed plugins).
> 
> You may help me if you would know in which direction I could look to handle
> it.
> 
> Thanks you
> Florent Beck
> 
> Here the error message: (as I got it in french I'll translate french
> parts into english within brackets after each line)
> Error message : >>>
> Impossible de charger PyQGIS. [Can't load PyQGIS.]
> Le support python va être désactivé. [Python support will be desabled
> (or deactivated ?).]
> 
> Traceback (most recent call last):
>   File "", line 1, in
> RuntimeError: the PyQt4.QtCore module is version 1 but the qgis.core
> module requires version -1
> 
> Version de Python : [Python's version :]
> 2.7.2+ (default, Oct  4 2011, 20:29:37)
> [GCC 4.6.1]
> 
> Version de QGIS :  [QGIS's version :]
> 1.7.1-Wroclaw 'Wroclaw', exported
> 
> Chemin vers Python : [Path to Python :]
> ['/usr/share/qgis/python',
> '/home/forest/.qgis/python',
> '/home/forest/.qgis/python/plugins',
> '/usr/share/qgis/python/plugins',
> '/usr/lib/python2.7',
> '/usr/lib/python2.7/plat-linux2',
> '/usr/lib/python2.7/lib-tk',
> '/usr/lib/python2.7/lib-old',
> '/usr/lib/python2.7/lib-dynload',
> '/usr/local/lib/python2.7/dist-packages',
> '/usr/lib/python2.7/dist-packages',
> '/usr/lib/python2.7/dist-packages/PIL',
> '/usr/lib/python2.7/dist-packages/gst-0.10',
> '/usr/lib/python2.7/dist-packages/gtk-2.0',
> '/usr/lib/pymodules/python2.7',
> '/usr/lib/python2.7/dist-packages/ubuntu-sso-client',
> '/usr/lib/python2.7/dist-packages/ubuntuone-client',
> '/usr/lib/python2.7/dist-packages/ubuntuone-control-panel',
> '/usr/lib/python2.7/dist-packages/ubuntuone-couch',
> '/usr/lib/python2.7/dist-packages/ubuntuone-installer',
> '/usr/lib/python2.7/dist-packages/ubuntuone-storage-protocol',
> '/usr/lib/python2.7/dist-packages/wx-2.8-gtk2-unicode']
> 
> <<< END of the error message.
> Thanks in advance for each kind of help.
> Florent
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Re: [Qgis-user] group symbology layers

[Giovanni Manghi]

Hi,


> In the layer properties, tab Style: Is it possible to use 'categorized' 
> as a style, and then group certain categories? I tried right clicking 
> the categories that I want to group (searching for the group option like 
> in ArcGis), nothing there, and didn't find it in the manual either. Did 
> I overlook it? I've now given the categories that I would've liked to 
> group the same symbol, but then they still appear individually in the 
> legend.

we had the same feature (if I understand well) in the old symbology, but
not yet in the new one

http://hub.qgis.org/issues/3275


cheers

-- Giovanni --

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Re: [Qgis-user] Transparency of categorized layers

[Giovanni Manghi]

Hi,

On Mon, 2011-11-14 at 15:22 -0800, Roger André wrote:
> Hi All,
> 
> 
> Is there a way to apply a uniform amount of transparency to every
> category in a categorized layer?  In other words, to treat the
> categorized layers as a single group, and apply transparency to the
> group.


I agree that the overall transparency slider is missing form the new
symbology (graduated and categorized) like we have in the old symbology.

http://hub.qgis.org/issues/2861

In any case at least in the development version of QGIS you can select
multiple symbology classes, right click the mouse and set the
transparency of those classes.

cheers

-- Giovanni --


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