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

[Giuseppe Sucameli]

Hi Martin,

On 30/ott/2010, at 11:12, Martin Dobias  wrote:
> So as David already suggested, to ensure you are really working with
> the nearest geometry, you should check the real distance.
After the David's message I searched for a good solution which can work fine in 
every cases.

So I resolved the issue using the further bbox border as search limit for the 
second phase.

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

[Martin Dobias]

On Thu, Oct 28, 2010 at 7:48 AM, Ziegler Stefan  wrote:
> Hi Giuseppe
>
> thanks for looking into this. Do you think it's worth filling out a bug 
> report since the nearestNeighbor method does not the  keep the promise or is 
> this the normal behaviour of a spatial index based method?

Spatial index uses only the bounding boxes of geometries for two
reasons: most importantly the intersection test (used when traversing
the data structure) is much faster when compared to testing
intersection of real geometry. Second, this would require spatial
index to store all geometries - this memory overhead can be
significant for bigger layers.

So as David already suggested, to ensure you are really working with
the nearest geometry, you should check the real distance.

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

[David Fawcett]

Isn't a problem like this usually solved with a two-pass method.

The first pass uses the spatial index to eliminate all of the features
that could not possibly intersect/touch/etc.  And then in the second
pass, an actual (more expensive) spatial overlay operation is
performed on those candidates to determine their true spatial
relationships.

David.

On Thu, Oct 28, 2010 at 10:29 AM, Giuseppe Sucameli
 wrote:
> Hi Stefan,
>
> On Thu, Oct 28, 2010 at 7:48 AM, Ziegler Stefan 
> wrote:
>>
>> thanks for looking into this. Do you think it's worth filling out a bug
>> report since the nearestNeighbor method does not the  keep the promise or is
>> this the normal behaviour of a spatial index based method?
>
> I think we should fill a bug report because the nearestNeighbor doesn't work
> as
> expected.
> I don't know if the QgsSpatialIndex can be improved to manage complex
> geometries,
> but AFAICS in the few inline comments within the code, in this moment it
> manages only
> Points, Lines and Regions (rectangles), so every polygonal geometry must be
> converted to Regions.
>
> This issue could take a lot of time to be fixed, but we can use the ticket
> to require
> the documentation about the QgsSpatialIndex class. In this moment it's
> missing.
>
> Cheers.
>
>>
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Re: AW: Re: Fwd: [Qgis-user] QGIS "Near"

[Giuseppe Sucameli]

Hi Stefan,

On Thu, Oct 28, 2010 at 7:48 AM, Ziegler Stefan wrote:

> thanks for looking into this. Do you think it's worth filling out a bug
> report since the nearestNeighbor method does not the  keep the promise or is
> this the normal behaviour of a spatial index based method?
>
I think we should fill a bug report because the nearestNeighbor doesn't work
as
expected.
I don't know if the QgsSpatialIndex can be improved to manage complex
geometries,
but AFAICS in the few inline comments within the code, in this moment it
manages only
Points, Lines and Regions (rectangles), so every polygonal geometry must be
converted to Regions.

This issue could take a lot of time to be fixed, but we can use the ticket
to require
the documentation about the QgsSpatialIndex class. In this moment it's
missing.

Cheers.


> - Originalnachricht -
> Von: "Giuseppe Sucameli" 
> Gesendet: Mit, 27.10.2010 17:30
> An: "Ziegler Stefan" 
> Cc: "Jim Hammack"  ; qgis-user <
> qgis-user@lists.osgeo.org>
> Betreff: Re: AW: Re: Fwd: [Qgis-user] QGIS "Near"
>
> Hi Stefan,
> your workaround works fine in my case!
>
> I looked at the QgsSpatialIndex code and I have bad news... It uses the
> bounding box
> of the geometries!
> This means that your workaround can work in a lot of cases but not in all
> cases, e.g. if
>
>
> you have more than N geometries (10 considering your workaround), ones
> inside
> each other.
>
> Cheers.
>
> On Tue, Oct 26, 2010 at 6:47 PM, Ziegler Stefan 
> wrote:
>
>
>
> Hi Giuseppe
>
>
>
> I wrote a little workaround. Could you please update to 0.0.6 and check it
> with your test case? Thanks.
>
>
>
> regards
>
> Stefan
>
>
>
> mit freundlichem Gruss
>
> Stefan Ziegler
>
>
>
>
>
> ----- Originalnachricht -
>
> Von: "Giuseppe Sucameli" 
>
> Gesendet: Mon, 25.10.2010 14:09
>
> An: "Ziegler Stefan" 
>
> Cc: "Jim Hammack"  ; qgis-user <
> qgis-user@lists.osgeo.org>
>
>
>
> Betreff: Re: AW: Re: Fwd: [Qgis-user] QGIS "Near"
>
>
>
> Hi all,
>
>
>
> two days ago I wrote a similar plugin for a LD talk  in Pisa.
>
> I was unaware of the QgsSpatialIndex class (seems there's no documentation
>
> about it in the online QGis API  pages or maybe I missed it) so I wrote a
> simple
>
>
>
>
>
> loop to find the closest feature.
>
>
>
> Now I tried also the Nearest plugin and they are different behavior!
>
> See the scheenshots [1] [2].
>
>
>
> AFAICS, Nearest select a wrong polygon.
>
> I see the plugin's code and I think it could a QgsSpatialIndex bug, but it
> could be
>
>
>
>
>
> also the normal behaviour (I didn't found its documentation on the API
> pages
>
> so I don't know).
>
>
>
> I'm going to add my plugin (ClosestFeatureFinded) to the Faunalia repo so
> you
>
> can try it and check the different behavior.
>
>
>
>
>
>
>
> I hope this can help to find the bug (if any).
>
> If you confirm it, I'll fill a bug report.
>
>
>
> Cheers.
>
>
>
> [1] http://img87.imageshack.us/img87/3232/nearest.jpg
>
>
>
>
>
> [2] http://img64.imageshack.us/img64/2066/closest.jpg
>
>
>
> On Fri, Oct 22, 2010 at 9:19 AM, Ziegler Stefan 
> wrote:
>
>
>
>
>
> 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

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

[Ziegler Stefan]

Hi Giuseppe

thanks for looking into this. Do you think it's worth filling out a bug report 
since the nearestNeighbor method does not the  keep the promise or is this the 
normal behaviour of a spatial index based method?

regards
Stefan

mit freundlichem Gruss
Stefan Ziegler


- Originalnachricht -
Von: "Giuseppe Sucameli" 
Gesendet: Mit, 27.10.2010 17:30
An: "Ziegler Stefan" 
Cc: "Jim Hammack"  ; qgis-user 
Betreff: Re: AW: Re: Fwd: [Qgis-user] QGIS "Near"

Hi Stefan, 
your workaround works fine in my case! 

I looked at the QgsSpatialIndex code and I have bad news... It uses the 
bounding box 
of the geometries!
This means that your workaround can work in a lot of cases but not in all 
cases, e.g. if 


you have more than N geometries (10 considering your workaround), ones inside 
each other.

Cheers.

On Tue, Oct 26, 2010 at 6:47 PM, Ziegler Stefan  wrote:



Hi Giuseppe



I wrote a little workaround. Could you please update to 0.0.6 and check it with 
your test case? Thanks.



regards

Stefan



mit freundlichem Gruss

Stefan Ziegler





- Originalnachricht -

Von: "Giuseppe Sucameli" 

Gesendet: Mon, 25.10.2010 14:09

An: "Ziegler Stefan" 

Cc: "Jim Hammack"  ; qgis-user 



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



Hi all,



two days ago I wrote a similar plugin for a LD talk  in Pisa.

I was unaware of the QgsSpatialIndex class (seems there's no documentation

about it in the online QGis API  pages or maybe I missed it) so I wrote a simple





loop to find the closest feature.



Now I tried also the Nearest plugin and they are different behavior!

See the scheenshots [1] [2].



AFAICS, Nearest select a wrong polygon.

I see the plugin's code and I think it could a QgsSpatialIndex bug, but it 
could be





also the normal behaviour (I didn't found its documentation on the API pages

so I don't know).



I'm going to add my plugin (ClosestFeatureFinded) to the Faunalia repo so you

can try it and check the different behavior.







I hope this can help to find the bug (if any).

If you confirm it, I'll fill a bug report.



Cheers.



[1] http://img87.imageshack.us/img87/3232/nearest.jpg





[2] http://img64.imageshack.us/img64/2066/closest.jpg



On Fri, Oct 22, 2010 at 9:19 AM, Ziegler Stefan  wrote:





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

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

[Ziegler Stefan]

Hi Giuseppe

I wrote a little workaround. Could you please update to 0.0.6 and check it with 
your test case? Thanks.

regards
Stefan

mit freundlichem Gruss
Stefan Ziegler


- Originalnachricht -
Von: "Giuseppe Sucameli" 
Gesendet: Mon, 25.10.2010 14:09
An: "Ziegler Stefan" 
Cc: "Jim Hammack"  ; qgis-user 
Betreff: Re: AW: Re: Fwd: [Qgis-user] QGIS "Near"

Hi all, 

two days ago I wrote a similar plugin for a LD talk  in Pisa.
I was unaware of the QgsSpatialIndex class (seems there's no documentation 
about it in the online QGis API  pages or maybe I missed it) so I wrote a 
simple 


loop to find the closest feature.

Now I tried also the Nearest plugin and they are different behavior!
See the scheenshots [1] [2].

AFAICS, Nearest select a wrong polygon.
I see the plugin's code and I think it could a QgsSpatialIndex bug, but it 
could be 


also the normal behaviour (I didn't found its documentation on the API pages 
so I don't know).

I'm going to add my plugin (ClosestFeatureFinded) to the Faunalia repo so you 
can try it and check the different behavior. 



I hope this can help to find the bug (if any). 
If you confirm it, I'll fill a bug report.

Cheers.

[1] http://img87.imageshack.us/img87/3232/nearest.jpg


[2] http://img64.imageshack.us/img64/2066/closest.jpg

On Fri, Oct 22, 2010 at 9:19 AM, Ziegler Stefan  wrote:


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,



  

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

[Ziegler Stefan]

Hi 

I'm also quite sure there is some unexpected behaviour in the 
QgsSpatialIndex.nearestNeighbor() method. The two screenshots look a bit like 
it has something to do with the bounding box? 

regards
Stefan

mit freundlichem Gruss
Stefan Ziegler


- Originalnachricht -
Von: "Giuseppe Sucameli" 
Gesendet: Mon, 25.10.2010 14:09
An: "Ziegler Stefan" 
Cc: "Jim Hammack"  ; qgis-user 
Betreff: Re: AW: Re: Fwd: [Qgis-user] QGIS "Near"

Hi all, 

two days ago I wrote a similar plugin for a LD talk  in Pisa.
I was unaware of the QgsSpatialIndex class (seems there's no documentation 
about it in the online QGis API  pages or maybe I missed it) so I wrote a 
simple 


loop to find the closest feature.

Now I tried also the Nearest plugin and they are different behavior!
See the scheenshots [1] [2].

AFAICS, Nearest select a wrong polygon.
I see the plugin's code and I think it could a QgsSpatialIndex bug, but it 
could be 


also the normal behaviour (I didn't found its documentation on the API pages 
so I don't know).

I'm going to add my plugin (ClosestFeatureFinded) to the Faunalia repo so you 
can try it and check the different behavior. 



I hope this can help to find the bug (if any). 
If you confirm it, I'll fill a bug report.

Cheers.

[1] http://img87.imageshack.us/img87/3232/nearest.jpg


[2] http://img64.imageshack.us/img64/2066/closest.jpg

On Fri, Oct 22, 2010 at 9:19 AM, Ziegler Stefan  wrote:


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

   

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

[Giuseppe Sucameli]

Hi all,

two days ago I wrote a similar plugin for a LD talk in Pisa.
I was unaware of the QgsSpatialIndex class (seems there's no documentation
about it in the online QGis API pages or maybe I missed it) so I wrote a
simple
loop to find the closest feature.

Now I tried also the Nearest plugin and they are different behavior!
See the scheenshots [1] [2].

AFAICS, Nearest select a wrong polygon.
I see the plugin's code and I think it could a QgsSpatialIndex bug, but it
could be
also the normal behaviour (I didn't found its documentation on the API pages

so I don't know).

I'm going to add my plugin (ClosestFeatureFinded) to the Faunalia repo so
you
can try it and check the different behavior.

I hope this can help to find the bug (if any).
If you confirm it, I'll fill a bug report.

Cheers.

[1] http://img87.imageshack.us/img87/3232/nearest.jpg
[2] http://img64.imageshack.us/img64/2066/closest.jpg

On Fri, Oct 22, 2010 at 9:19 AM, Ziegler Stefan wrote:

> 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,
>

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 "ne

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

   

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

[Jim Hammack]

  
  
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
  carto.net>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 the
  functionality I'm
  currently looking after.
  
  
  > Are you also aware that in QGIS 1.6 there are new
  selection tools?
  >
  > * by click
  > * by rectangle
  > * by polygon
  > * by freehand
  > * by radius
  >
  >
  Yup, these are great, but they all select _multiple_
  features within radius,
  rectangle, etc.
  
  
  > Maybe this also helps to address your needs?
  >
  > Of course you can 

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

[Ziegler Stefan]

Shame on me... Please update the plugin (0.0.3) and try again.

regards
Stefan

> -Ursprüngliche Nachricht-
> Von: Ricardo Filipe Soares Garcia da
> [mailto:ricardo.garcia.si...@gmail.com]
> Gesendet am: Donnerstag, 21. Oktober 2010 15:19
> An: qgis-user
> Betreff: Re: AW: Re: Fwd: [Qgis-user] QGIS "Near"
> 
> It is happening to me as well (Ubuntu 10.10, Qgis 1.5 from
> ubuntugis-unstable ppa)
> 
> > I have installed the plugin on qgis trunk and Ubuntu 10.04, and now
> > every time I exit qgis I get the following
> >
> > Traceback (most recent call last):
> >  File "/usr/lib/python2.6/dist-packages/qgis/utils.py", line 187, in
> > unloadPlugin
> >plugins[packageName].unload()
> >  File "/home/gio/.qgis/python/plugins/nearest/nearest.py", 
> line 102, in
> > unload
> >QObject.disconnect(self.tool, SIGNAL("featureFound()"),
> > self.selectFeature)
> > AttributeError: Nearest instance has no attribute 'tool'
> 
> 
> -- 
> ___ ___ __
> Ricardo Garcia Silva
> ___
> Qgis-user mailing list
> Qgis-user@lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/qgis-user
> 

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

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

[Ricardo Filipe Soares Garcia da]

It is happening to me as well (Ubuntu 10.10, Qgis 1.5 from
ubuntugis-unstable ppa)

> I have installed the plugin on qgis trunk and Ubuntu 10.04, and now
> every time I exit qgis I get the following
>
> Traceback (most recent call last):
>  File "/usr/lib/python2.6/dist-packages/qgis/utils.py", line 187, in
> unloadPlugin
>    plugins[packageName].unload()
>  File "/home/gio/.qgis/python/plugins/nearest/nearest.py", line 102, in
> unload
>    QObject.disconnect(self.tool, SIGNAL("featureFound()"),
> self.selectFeature)
> AttributeError: Nearest instance has no attribute 'tool'


-- 
___ ___ __
Ricardo Garcia Silva
___
Qgis-user mailing list
Qgis-user@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/qgis-user

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

[Giovanni Manghi]

Hi,

I have installed the plugin on qgis trunk and Ubuntu 10.04, and now
every time I exit qgis I get the following

Traceback (most recent call last):
  File "/usr/lib/python2.6/dist-packages/qgis/utils.py", line 187, in
unloadPlugin
plugins[packageName].unload()
  File "/home/gio/.qgis/python/plugins/nearest/nearest.py", line 102, in
unload
QObject.disconnect(self.tool, SIGNAL("featureFound()"),
self.selectFeature)
AttributeError: Nearest instance has no attribute 'tool'


cheers

-- Giovanni --



On Thu, 2010-10-21 at 10:22 +0200, Ziegler Stefan wrote:
> Hi Zoran
> 
> > As I can see the main stuff is in "featurefindertool.py"? And it works 
> > through all the features in the selected layer every time?
> Yes, the interesting stuff is in featurefindertool.py. Yes, it works through 
> all the features in the selected layer.
> 
> 
> > But, I really do not have that many features, and it takes 2-3 seconds to 
> > find the nearest feature on my, not so very new laptop, 
> > in a layer with cca 4200 point features.Ok, this is due to the spatial 
> > index that is build everytime you click on the map. I changed this 
> > behaviour; the index is build only for the first time (or when you change 
> > the current layer of course). It takes 3 secondes for 50'000 point features 
> > and 40 seconds for 600'000 point features for the first search (on our 
> > server). The second click/search is just "real-time". Please update the 
> > plugin and try it and let me know.
> 
> regards
> Stefan
> 
> 
> 
> 
> 
> 
> On Wed, Oct 20, 2010 at 8:54 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  carto.net>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 the 
> functionality I'm
> 
> currently looking after.
> 
> 
> 
> 
> 
> > Are you also 
> aware that in QGIS 1.6 there are new selection tools?
> 
> >
> 
> > * by 
> click
> 
> > * by rectangle
> 
> > * by polygon
> 
> > * by 
> freehand
> 
> > * by radius
> 
> >
> 
> >
> 
> Yup, these are great, but 
> they all select _multiple_ features within radius,
> 
> rectangle, 
> etc.
> 
> 
> 
> 
> 
> > May

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

[Ziegler Stefan]

Hi Zoran

> As I can see the main stuff is in "featurefindertool.py"? And it works 
> through all the features in the selected layer every time?
Yes, the interesting stuff is in featurefindertool.py. Yes, it works through 
all the features in the selected layer.


> But, I really do not have that many features, and it takes 2-3 seconds to 
> find the nearest feature on my, not so very new laptop, 
> in a layer with cca 4200 point features.Ok, this is due to the spatial index 
> that is build everytime you click on the map. I changed this behaviour; the 
> index is build only for the first time (or when you change the current layer 
> of course). It takes 3 secondes for 50'000 point features and 40 seconds for 
> 600'000 point features for the first search (on our server). The second 
> click/search is just "real-time". Please update the plugin and try it and let 
> me know.

regards
Stefan






On Wed, Oct 20, 2010 at 8:54 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 the 
functionality I'm

currently looking after.





> Are you also 
aware that in QGIS 1.6 there are new selection tools?

>

> * by 
click

> * by rectangle

> * by polygon

> * by 
freehand

> * by radius

>

>

Yup, these are great, but 
they all select _multiple_ features within radius,

rectangle, 
etc.





> Maybe this also helps to address your 
needs?

>

> Of course you can combine it with previous selections 
by pressing the ctrl

> 
key.

>

>



BR,





---

Zoran 
Jankovic

ZIS-Izrada softvera i savjetovanje / ZIS - Software Development 
and

Consulting



http://www.zisis.hr



M: 00 385 98 682 
902

T:  00 385 44 683 374



A. Senoe 4

44320 
Kutina

Croatia





___

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mailing list

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http://lists.osgeo.org/mailman/listinfo/qgis-user






  





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

[Ziegler Stefan]

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 < joela...@gmail.com>
   wrote:
   

  Does the function 'snapWithContext'
  http://doc.qgis.org/head/classQgsVectorLayer.html#733b974dce13d587
  e05cf3d4fc24f208
  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 the functionality
  I'm
  currently looking after.
  
  
  > Are you also aware that in QGIS 1.6 there are new selection
  tools?
  >
  > * by click
  > * by rectangle
  > * by polygon
  > * by freehand
  > * by radius
  >
  >
  Yup, these are great, but they all select _multiple_ features
  within radius,
  rectangle, etc.
  
  
  > Maybe this also helps to address your needs?
  >
  > Of course you can combine it with previous selections by
  pressing the ctrl
  > key.
  >
  >
  
  BR,
  
  
  ---
  Zoran Jankovic
  ZIS-Izrada softvera i savjetovanje / ZIS - Software Development
  and
  Consulting
  
  http://www.zisis.hr
  
  M: 00 385 98 682 902
  T:  00 385 44 683 374
  
  A. Senoe 4
  44320 Kutina
  Croatia
  
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