[Qgis-user] PostGIS 2 SHP

[Andrea Peri 2007]

Hi fellows,

I am loading a postgis Layer and then saving it to shapefile. Job gets done.
BUT, data type character varying, or character, is always set to 255 CHAR in
the shapefile.
Therefore, my dbf ends up being a huge table. Is this some bug or I am
simply doing something wrong ?

Any thoughts appreciated


Ricardo


The exporting procedure (save as) of qgis do this.

But if you use og2ogr (from gdal) to export from postgres to shapefile the 
string field was exactly the needed.
I test with the trunk version of gdal.

Regards,

Andrea Peri


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[Qgis-user] PostGIS 2 SHP

[Ricardo Bayley]

Hi fellows,

I am loading a postgis Layer and then saving it to shapefile. Job gets done.
BUT, data type character varying, or character, is always set to 255 CHAR in
the shapefile.
Therefore, my dbf ends up being a huge table. Is this some bug or I am
simply doing something wrong ?

Any thoughts appreciated


Ricardo
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[Qgis-user] Re: [Qgis-developer] Fwd: WKTRaster Plugin 0.1

[Maurício de Paulo]

Hi Tim!
I've used ubuntu with ubuntugis' repository.
postgis version 1.5, gdal version 1.7 (this is a requirement) and I had to
install wkt raster from source.
I'm going to write a post in my blog with my friend.
And as he's going to contribute we're changing the location to
mapeandoobrasil.blogspot.com
As usual it's going to be in portuguese, but I'm thinking about translating.

The main steps were: install qgis, mapserver, gdal-bin 1.7, postgresql 8.4,
libpqxx, gdal-dev, and postgis 1.5 from ubuntu gis. (yes, mapserver also
works with wktraster)
download the source for postgis 1.5.2 from postgis' site and download
wktraster extension's source.
Compile wktraster following the readme (you have to tell where the postgis
source is as there is no postgis-dev package).
Now this is a trick part: the raster must be reformatted. I've read
somewhere a guy teaching how to reformat (tiling, byte sequence, etc) it to
be able to import to wktraster.
I only tested with the raster available at the wktraster's page. My friend
is writing the "how to format the raster" part of our blog post.
Then you load the sql of wktraster to the database and translate to sql the
raster using gdal2wktraster.py from wktraster build.
Now it's available through the plugin.

I think this is a good abstract of how it's done. More details can be found
in blog posts around the net.
I'm going to implement the table listing in the plugin these weekend for now
you have to know the table name and type it down.
Good luck on your tests!

Ps.: We're also trying to compare performance of wktraster with terralib's
raster implementation as it's the only postgresql georaster library I've
heard of. But as preliminary results the performance of wktraster looks like
an issue at the momento.



2010/10/22 Tim Sutton 

> Hi
>
> Woohoo...can't wait to try that out! What postgis version did you use?
> Anything available in apt for wktraster + postgis?
>
> Regards
>
> Tim
>
> 2010/10/21 Maurício de Paulo :
> >
> >
> > -- Forwarded message --
> > From: Maurício de Paulo 
> > Date: 2010/10/21
> > Subject: WKTRaster Plugin 0.1
> > To: qgis-user@lists.osgeo.org, qgis-...@lists.osgeo.org
> >
> >
> > Hi everyone,
> > A friend of mine recently told me that wktraster is already storing and
> > loading raster to postgres. And it's even doing some spatial analisys
> with
> > vector data overlayed.
> > I've written a simple plugin to load wktraster tables into QGIS as gdal
> 1.7
> > already has a driver.
> > Sorry for the Windows users as I couldn't find a QGIS built with gdal 1.7
> > support so no wktraster for windows users.
> > I've tested with ubuntu-gis qgis' build.
> >
> > At the moment the plugin DOES NOT list the existing tables, so you have
> to
> > TYPE THE TABLENAME in the editbox.
> >
> > The plugin is available at the contributed repository.
> > Hope it's usefull
> >
> > --
> > 1º Ten Mauricio - Engenheiro Cartógrafo
> > 1ª Divisão de Levantamento
> > Exército Brasileiro - Braço Forte, Mão Amiga.
> >
> >
> >
> > --
> > 1º Ten Mauricio - Engenheiro Cartógrafo
> > 1ª Divisão de Levantamento
> > Exército Brasileiro - Braço Forte, Mão Amiga.
> >
> > ___
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> >
> >
>
>
>
> --
> Tim Sutton - QGIS Project Steering Committee Member (Release  Manager)
> ==
> Please do not email me off-list with technical
> support questions. Using the lists will gain
> more exposure for your issues and the knowledge
> surrounding your issue will be shared with all.
>
> Visit http://linfiniti.com to find out about:
>  * QGIS programming and support services
>  * Mapserver and PostGIS based hosting plans
>  * FOSS Consulting Services
> Skype: timlinux
> Irc: timlinux on #qgis at freenode.net
> ==
>



-- 
1º Ten Mauricio - Engenheiro Cartógrafo
1ª Divisão de Levantamento
Exército Brasileiro - Braço Forte, Mão Amiga.
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Re: [Qgis-user] google api key

[Giovanni Manghi]

you need to register @ google to obtain a google maps key.


cheers

-- Giovanni --

On Fri, 2010-10-22 at 10:01 -0700, Dario wrote:
> when using the plugin geocode, that:
> Google API Key is not set, please check plugin settings.
> How about this?
> 
> 
>  
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Re: AW: AW: Re: Fwd: [Qgis-user] QGIS "Near"

[Jim Hammack]

  
  
Stefan,

  Yes, I see that now.  I was using only points before and never
tried clicking inside a polygon.  I wouldn't think that would be
a very common event, though.

                                             Jim
  
On 10/22/2010 02:19 AM, Ziegler Stefan wrote:

  Hi

there is some strange behaviour when using it with polygon features (at least I think it's a bit strange): sometimes when you click into a polygon I would expect that it selects the polygon I clicked into but it selects an adjacent polygon. This is probably due to the nearestNeighbor method of the spatial index. Since the two neighboring polygons share a common border the distance would be equal but the spatial index does not check if the coordindates of the mouse click lies within one of the two polygons.

regards
Stefan

mit freundlichem Gruss
Stefan Ziegler


- Originalnachricht -
Von: "Jim Hammack" 
Gesendet: Don, 21.10.2010 19:20
An: "Ziegler Stefan" 
Cc: qgis-user 
Betreff: Re: AW: Re: Fwd: [Qgis-user] QGIS "Near"


Stefan,



 I was looking for the same functionality as Zoran so have
also been working with your "Nearest" plugin.  It is exactly
what I need and seems to work well.



Thanks!

Jim

  

On 10/20/2010 01:54 PM, Ziegler Stefan wrote:

  
  Hi Zoran
  
   
  
  I had some time left, took all
my code snippets and also the one from Carson. Please try
the plugin "Nearest" that should cover your example 1:
  
   
  
  http://www.catais.org/qgis/plugins.xml
  
   
  
  regards
  
  Stefan
  
  
-Ursprüngliche
Nachricht-

Von: Zoran Jankovic [mailto:zoran.janko...@zisis.hr]

Gesendet am: Mittwoch, 20. Oktober 2010 19:21

An: qgis-user

Betreff: Re: Fwd: [Qgis-user] QGIS "Near"

  

  Hi Joe, 






  On Wed, Oct 20, 2010 at 5:06 PM, Joe
Larson 
wrote:


  Does the function 'snapWithContext'

  http://doc.qgis.org/head/classQgsVectorLayer.html#733b974dce13d587e05cf3d4fc24f208

  which "Snaps to segment or vertex within given tolerance."
  seem like

  what you're looking for? I came across it while trying to
  get Quantum

  Navigator working recently...seemed relative, but I'm no
  expert!

  





This is similar to the mentioned solution with
  selecting by radius, or changing the tolerance of ID tool.
  Close, but no cigar. Since this is not very urgent, I've
  decided to continue pursuing that outlined solution Carson
  gave, and write a plugin i Python based on that. Since I
  actually never used Python before, it may take a while,
  but hey, I get to learn sth. new :-).

I never got the word back from Carson, has he developed
  anything along these lines, but I have to presume he
  didn't...

Anyone interested in joning me, or even earning some
  money, is still invited to jump on board. My GIS
  implementation project is well on the way, and it seems
  there'll even be some money involved :-). 

 

Zoran





  ~joe

  

  On Tue, Oct 19, 2010 at 9:55 AM, Andreas Neumann
  wrote:

  


  > Hi Zoran,

  >

  > I believe the infrastructure of what you want is
  already wihtin the

  > selection and identify tools in QGIS. Isn't this
  almost implemented in the

  > current identify tool?

  >

  >

  It sort of is, but not completely. Identify will ID
  all the features within

  certain radios (percentage of extent), but it will ID
  _all_ of the features

  within this radius. I only need the nearest, no matter
  how far away... Let

  us say it is, for simplicity, within current extent.

  

  

  > The current identify tool selects "near" or
  "close by" features within a

  > certain tolerance. This tolerance can be set in
  "Options" --> "

[Qgis-user] error postgis manager

[Dario]

After the actualization , the plugin postgis manager have an error:

Um erro ocorreu enquanto executava o seguinte código Python:

Traceback (most recent call last):
  File "C:\Documents and 
Settings\Dgalvao/.qgis/python/plugins\postgis_manager\ManagerWindow.py", line 
113, in dbConnectInit
self.dbConnect(selected)
  File "C:\Documents and 
Settings\Dgalvao/.qgis/python/plugins\postgis_manager\ManagerWindow.py", line 
165, in dbConnect
self.refreshTable()
  File "C:\Documents and 
Settings\Dgalvao/.qgis/python/plugins\postgis_manager\ManagerWindow.py", line 
244, in refreshTable
model.loadFromDb(self.db)
  File "C:\Documents and 
Settings\Dgalvao/.qgis/python/plugins\postgis_manager\DatabaseModel.py", line 
177, in loadFromDb
self.tree.constructTreeFromDb(self.db)
  File "C:\Documents and 
Settings\Dgalvao/.qgis/python/plugins\postgis_manager\DatabaseModel.py", line 
77, in constructTreeFromDb
list_tables = db.list_geotables()
  File "C:\Documents and 
Settings\Dgalvao/.qgis/python/plugins\postgis_manager\postgis_utils.py", line 
256, in list_geotables
items[i] = geo_item
IndexError: list assignment index out of range

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


Versão do QGIS
1.5.0-Tethys Tethys, 13923M

Caminho para o Python: ['C:\\Documents and 
Settings\\Dgalvao\\.qgis\\python\\plugins\\GeoCoding', 'C:\\Documents and 
Settings\\Dgalvao\\.qgis\\python\\plugins\\elevation', 
'C:/OSGeo4W/apps/qgis/./python', 'C:\\Documents and 
Settings\\Dgalvao/.qgis/python', 'C:\\Documents and 
Settings\\Dgalvao/.qgis/python/plugins', 
'C:/OSGeo4W/apps/qgis/./python/plugins', 'C:\\OSGeo4W\\apps\\gdal-16\\pymod', 
'C:\\Documents and Settings\\Dgalvao\\Desktop', 
'C:\\OSGeo4W\\bin\\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', 
u'C:/Documents and Settings/Dgalvao/.qgis//python/plugins', 
'C:\\OSGeo4W\\apps\\qgis\\python\\plugins\\fTools\\tools', 'C:\\Documents and 
Settings\\Dgalvao\\.qgis\\python\\plugins\\cadtools\\tools', 
'/usr/share/qgis/python', 'C:/Documents and Settings/Dgalvao/Desktop']



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[Qgis-user] google api key

[Dario]

when using the plugin geocode, that:
Google API Key is not set, please check plugin settings.
How about this?



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Re: [Qgis-user] Plug-in not working: spqr

[Benoit de Cabissole]

  
  
Hi Phil,

In another thread Alexander Bruy gave a good tip to install python
Windows packages in OGGeo4W:

Namely, you download the package exe file and open it with 7-zip
(freeware).
7-zip will display folders and files inside the exe file.
You simply have to find the correct folder and the .egg file (if
any) and extract them to the python package folder in the OSGeo4W
installation tree keeping the folder structure of the exe file.

It has worked for me on many occasions. Try it on the R packages and
see if it helps...

HTH,
Benoit


On 22/10/2010 16:53, Phil Morefield wrote:

  
  
Carson,

  
I'm
a Windows user, and I think that is causing me problems. The
rpy package that comes from the OSGeo4W installer (1.0.3) is
configured for R 2.6.2. and Python 2.5. rpy2 requires R
>= 2.8.0.

  
I
haven't been able to locate rpy windows installers for
Python 2.5 and R >= 2.8.0. So in a
  nutshell: there is no version of R that overlaps both rpy
  and rpy2 when they are installed on Python 2.5. I've
tried unsuccessfully to create my own Windows installer for
rpy; there is an issue with the C++ header files changing in
later versions of R, which is way beyond my expertise.

  
I'm
all ears if you, or anyone else, has more ideas.

  
Phil

  

  

  
 



  
  From:
  Carson Farmer 
  To: Phil
  Morefield 
  Cc:
  qgis-user@lists.osgeo.org
  Sent: Wed,
  October 20, 2010 8:39:56 PM
  Subject:
  Re: [Qgis-user] Plug-in not working: spqr

spqr requires rpy (rather than rpy2). You should be able to
install both rpy and rpy2 on the same system, so it
shouldn't be a problem to install rpy and get going with
spqr.


Carson
  
  
On 21 October 2010 01:26, Phil Morefield 
wrote:

  

  
 I must have tried
  to install it a thousand times. Every time I
  get the same message:
  
"The plug-in is broken.
  Python said:
  Couldn't obtain version from output of 'R
  --version'."

Other plug-ins relying on R work fine. "R
--version" gives me long string that includes
the version number. Anyone have a bright idea?
  
  


  
  
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  -- 
  Carson J. Q. Farmer
  ISSP Doctoral Fellow
  National Centre for Geocomputation
  National University of Ireland, Maynooth,
  http://www.carsonfarmer.com/

  

  
  
  

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Re: [Qgis-user] Color ramps: vector and raster

[Benoit de Cabissole]

 Agus,

Yes, I guess they could be used in the New Symbology Layer properties.
The colour palettes have very simple file formats so they could be
easily integrated by other functions.
Also, it has been strongly suggested that the '1-band raster colour
table' plugin be integrated in QGIS core functionality. In such a case
the colour palettes could be accessible from any part of the QGIS
environment.

Cheers,
Benoit


On 22/10/2010 12:23, Agustin Lobo wrote:
> Hi!
>
> Could the excellent color ramps provided in the new plugin "1-band
> raster colour table"
> (thanks Benoit!!) be also available in the New Symbology  Layer
> properties/Color Ramp for vector layers?
>
> Agus
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Re: [Qgis-user] Plug-in not working: spqr

[Phil Morefield]

Carson,

I'm a Windows user, and I think that is causing me problems. The rpy package 
that comes from the OSGeo4W installer (1.0.3) is configured for R 2.6.2. and 
Python 2.5. rpy2 requires R >= 2.8.0.

I haven't been able to locate rpy windows installers for Python 2.5 and R >= 
2.8.0. So in a nutshell: there is no version of R that overlaps both rpy and 
rpy2 when they are installed on Python 2.5. I've tried unsuccessfully to create 
my own Windows installer for rpy; there is an issue with the C++ header files 
changing in later versions of R, which is way beyond my expertise.

I'm all ears if you, or anyone else, has more ideas.

Phil



 





From: Carson Farmer 
To: Phil Morefield 
Cc: qgis-user@lists.osgeo.org
Sent: Wed, October 20, 2010 8:39:56 PM
Subject: Re: [Qgis-user] Plug-in not working: spqr

spqr requires rpy (rather than rpy2). You should be able to install both rpy 
and 
rpy2 on the same system, so it shouldn't be a problem to install rpy and get 
going with spqr.

Carson


On 21 October 2010 01:26, Phil Morefield  wrote:


> I must have tried to install it a thousand times. Every time I get the same 
>message:
>"The plug-in is broken. Python said:
>Couldn't obtain version from output of 'R --version'."
>
>Other plug-ins relying on R work fine. "R --version" gives me long string that 
>includes the version number. Anyone have a bright idea?
>
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>


-- 
Carson J. Q. Farmer
ISSP Doctoral Fellow
National Centre for Geocomputation
National University of Ireland, Maynooth,
http://www.carsonfarmer.com/



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[Qgis-user] Color ramps: vector and raster

[Agustin Lobo]

Hi!

Could the excellent color ramps provided in the new plugin "1-band
raster colour table"
(thanks Benoit!!) be also available in the New Symbology  Layer
properties/Color Ramp for vector layers?

Agus
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Re: [Qgis-user] plugin to import raw binary raster data

[Agustin Lobo]

I've  tested including a resources.py file and the plugin works (the
menu opens, have
not imported anything yet).

Agus

2010/10/22 Giuseppe Sucameli :
> Hi guys,
>
> On Fri, Oct 22, 2010 at 10:25 AM, Agustin Lobo 
> wrote:
>>
>> Which module is the one actually needed?
>
> it's a plugin's missing module. You don't need to install anything.
>
> To Ghishlain:
> could you update your plugin either removing "import resources" (line 27)
> from
> the RawRasterFileImport.py module or creating a resources.py empty file?
>
> Cheers.
>
>>
>> 2010/10/21 Ghislain Picard :
>> >
>> > A new plugin is available to help importing raw binary raster data into
>> > QGIS.
>> > The plugin creates a VRT file from information about the file structure
>> > given by the user. The VRT file can then be opened with QGis as any
>> > other
>> > raster format.
>> > Ghislain
>> >
>> >
>> > ___
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>> > Qgis-user@lists.osgeo.org
>> > http://lists.osgeo.org/mailman/listinfo/qgis-user
>> >
>> ___
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>
>
> --
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>
>
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Re: [Qgis-user] plugin to import raw binary raster data

[Giuseppe Sucameli]

Hi guys,

On Fri, Oct 22, 2010 at 10:25 AM, Agustin Lobo wrote:

> Which module is the one actually needed?
>
it's a plugin's missing module. You don't need to install anything.

To Ghishlain:
could you update your plugin either removing "import resources" (line 27)
from
the RawRasterFileImport.py module or creating a resources.py empty file?

Cheers.


>
> 2010/10/21 Ghislain Picard :
> >
> > A new plugin is available to help importing raw binary raster data into
> > QGIS.
> > The plugin creates a VRT file from information about the file structure
> > given by the user. The VRT file can then be opened with QGis as any other
> > raster format.
> > Ghislain
> >
> >
> > ___
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Re: [Qgis-user] Error with Raster tools on MacOSX

[Giuseppe Sucameli]

Hi Agus,
I think we solved it few weeks ago. See [1].

Try to setup both python and binaries paths in the "path to GDAL binaries"
textbox within the "GdalTools settings" dialog.
You must separate them by :

/usr/bin:/Library/Frameworks/GDAL.framework/Versions/1.7/Programs/

Cheers.

[1] http://www.mail-archive.com/qgis-user@lists.osgeo.org/msg07436.html

On Fri, Oct 22, 2010 at 10:16 AM, Agustin Lobo wrote:

> On behalf of Joao Lampreia
> I'm sending this report on problems running Raster tools in QGIS
>
> "I am getting an error when trying to use any of the GDAL tools, such
> as polygonise or proximity... without this I`m not being able to go
> progress at all in the exercise.
> Would you perhaps know what this error msg is about?
>
> I have reinstalled GDAL tools, restarted the program, but still have
> the same problem...
>
> attached is an image of the error...
> "
> (image in https://sites.google.com/site/openfiles2/home/ERRORMESG.tiff )
>
> Mac OSX: 10.6.3
> Hardware Overview:
>  Model Name:MacBook Pro
>  Model Identifier:MacBookPro7,1
>  Processor Name:Intel Core 2 Duo
>  Processor Speed:2.4 GHz
>  Number Of Processors:1
>  Total Number Of Cores:2
>  L2 Cache:3 MB
>  Memory:4 GB
>  Bus Speed:1.07 GHz
>  Boot ROM Version:MBP71.0039.B05
>  Hardware UUID:0D4CE128-E01E-57E1-BE26-53E355A2E3F4
>
>
> Agus
>
> Joao: you should subscribe to the QGIS users list for following this issue:
> http://www.qgis.org/community/mailing-lists.html
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Re: [Qgis-user] plugin to import raw binary raster data

[Agustin Lobo]

Great but I get an error message on ubuntu 9.10 stating that I must
install the python module "resources", despite I do have python-pkg-resources
installed. Which module is the one actually needed?

Agus

2010/10/21 Ghislain Picard :
>
> A new plugin is available to help importing raw binary raster data into
> QGIS.
> The plugin creates a VRT file from information about the file structure
> given by the user. The VRT file can then be opened with QGis as any other
> raster format.
> Ghislain
>
>
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[Qgis-user] Error with Raster tools on MacOSX

[Agustin Lobo]

On behalf of Joao Lampreia
I'm sending this report on problems running Raster tools in QGIS

"I am getting an error when trying to use any of the GDAL tools, such
as polygonise or proximity... without this I`m not being able to go
progress at all in the exercise.
Would you perhaps know what this error msg is about?

I have reinstalled GDAL tools, restarted the program, but still have
the same problem...

attached is an image of the error...
"
(image in https://sites.google.com/site/openfiles2/home/ERRORMESG.tiff )

Mac OSX: 10.6.3
Hardware Overview:
  Model Name:MacBook Pro
  Model Identifier:MacBookPro7,1
  Processor Name:Intel Core 2 Duo
  Processor Speed:2.4 GHz
  Number Of Processors:1
  Total Number Of Cores:2
  L2 Cache:3 MB
  Memory:4 GB
  Bus Speed:1.07 GHz
  Boot ROM Version:MBP71.0039.B05
  Hardware UUID:0D4CE128-E01E-57E1-BE26-53E355A2E3F4


Agus

Joao: you should subscribe to the QGIS users list for following this issue:
http://www.qgis.org/community/mailing-lists.html
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[Qgis-user] Re: Re: QGIS 1.5 Update for ECW/SID support crashes

[Agustin Lobo]

Considering the practical importance of mersid and ecw support, I suggest
having an specific entry for this subject (i.e., "MrSid and ECW support in
QGIS") in the wiki, explaining the potential problems
and the solutions. Perhaps in the users corner? 

Also, in general, I suggest that the main QGIS page should have an entry
"Known Problems". I know it is
possible to search the bug tickets, but the most prominent problems should
be highlighted for new users.

Agus
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AW: AW: Re: Fwd: [Qgis-user] QGIS "Near"

[Ziegler Stefan]

Hi

there is some strange behaviour when using it with polygon features (at least I 
think it's a bit strange): sometimes when you click into a polygon I would 
expect that it selects the polygon I clicked into but it selects an adjacent 
polygon. This is probably due to the nearestNeighbor method of the spatial 
index. Since the two neighboring polygons share a common border the distance 
would be equal but the spatial index does not check if the coordindates of the 
mouse click lies within one of the two polygons.

regards
Stefan

mit freundlichem Gruss
Stefan Ziegler


- Originalnachricht -
Von: "Jim Hammack" 
Gesendet: Don, 21.10.2010 19:20
An: "Ziegler Stefan" 
Cc: qgis-user 
Betreff: Re: AW: Re: Fwd: [Qgis-user] QGIS "Near"


Stefan,



 I was looking for the same functionality as Zoran so have
also been working with your "Nearest" plugin.  It is exactly
what I need and seems to work well.



Thanks!

Jim

  

On 10/20/2010 01:54 PM, Ziegler Stefan wrote:

  
  Hi Zoran
  
   
  
  I had some time left, took all
my code snippets and also the one from Carson. Please try
the plugin "Nearest" that should cover your example 1:
  
   
  
  http://www.catais.org/qgis/plugins.xml
  
   
  
  regards
  
  Stefan
  
  
-Ursprüngliche
Nachricht-

Von: Zoran Jankovic [mailto:zoran.janko...@zisis.hr]

Gesendet am: Mittwoch, 20. Oktober 2010 19:21

An: qgis-user

Betreff: Re: Fwd: [Qgis-user] QGIS "Near"

  

  Hi Joe, 






  On Wed, Oct 20, 2010 at 5:06 PM, Joe
Larson 
wrote:


  Does the function 'snapWithContext'

  
http://doc.qgis.org/head/classQgsVectorLayer.html#733b974dce13d587e05cf3d4fc24f208

  which "Snaps to segment or vertex within given tolerance."
  seem like

  what you're looking for? I came across it while trying to
  get Quantum

  Navigator working recently...seemed relative, but I'm no
  expert!

  





This is similar to the mentioned solution with
  selecting by radius, or changing the tolerance of ID tool.
  Close, but no cigar. Since this is not very urgent, I've
  decided to continue pursuing that outlined solution Carson
  gave, and write a plugin i Python based on that. Since I
  actually never used Python before, it may take a while,
  but hey, I get to learn sth. new :-).

I never got the word back from Carson, has he developed
  anything along these lines, but I have to presume he
  didn't...

Anyone interested in joning me, or even earning some
  money, is still invited to jump on board. My GIS
  implementation project is well on the way, and it seems
  there'll even be some money involved :-). 

 

Zoran





  ~joe

  

  On Tue, Oct 19, 2010 at 9:55 AM, Andreas Neumann
  wrote:

  


  > Hi Zoran,

  >

  > I believe the infrastructure of what you want is
  already wihtin the

  > selection and identify tools in QGIS. Isn't this
  almost implemented in the

  > current identify tool?

  >

  >

  It sort of is, but not completely. Identify will ID
  all the features within

  certain radios (percentage of extent), but it will ID
  _all_ of the features

  within this radius. I only need the nearest, no matter
  how far away... Let

  us say it is, for simplicity, within current extent.

  

  

  > The current identify tool selects "near" or
  "close by" features within a

  > certain tolerance. This tolerance can be set in
  "Options" --> "Map tools"

  > "search radius". I believe it currently only
  effects the identify tool. Do

  > you want the same tolerance also be used for the
  click-selection tool?

  >

  >

  Look above. This could be useful, but it is not