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 <Stefan.Ziegler at bd.so.ch> 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.jankovic at 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 <joelarso at gmail.com> 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 <a.neumann at 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 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



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