[Qgis-user] scale dependent point clustering (for visualization only)

[Andreas Neumann]

 No, the point displacement render is almost the opposite to clustering. 
 It explodes feature that are stacked on top of each other so one can see 
 that there are several features at the same place with potentially 
 different symbolization.

 A cluster renderer would be a valuable addition to QGIS as a separate 
 renderer. If your data resides in Postgis, you can also use Postgis and 
 a view if you need clustering. I once did this for a report information 
 system. You can round the coordinates and group/aggregate them and then 
 average by its original coordinates so that the cluster position is at 
 the weighted coordinate of all input point geometries. It is not very 
 hard to do in Postgis.

 Andreas

 On Fri, 27 May 2011 11:50:07 +0200, Anita Graser wrote:
> Isn't that what Point Displacement Renderer does?
>
> Best wishes,
>
> Anita
>
> On Fri, May 27, 2011 at 10:59 AM, Giovanni Manghi  wrote:
>
>> seems a nive idea for a plugin.
>>
>> Cheers
>>
>> -- Giovanni --
>>
>> On Fri, 2011-05-27 at 16:57 +0800, maning sambale wrote:
>> > I'm looking for ways to create simple visualization of point
>> clusters
>> > (in QGIS of course) similar to the openlayers cluster strategy:
>> > http://openlayers.org/dev/examples/strategy-cluster.html [1]
>> > The purpose is simply for visualization and can be configured by
>> map scale.
>> >
>>
>> _______________________________________________
>> Qgis-user mailing list
>> Qgis-user at lists.osgeo.org [2]
>> http://lists.osgeo.org/mailman/listinfo/qgis-user [3]
>
>
>
> Links:
> ------
> [1] http://openlayers.org/dev/examples/strategy-cluster.html
> [2] mailto:Qgis-user at lists.osgeo.org
> [3] http://lists.osgeo.org/mailman/listinfo/qgis-user
> [4] mailto:giovanni.manghi at gmail.com

-- 
 --
 Andreas Neumann
 Böschacherstrasse 10A
 8624 Grüt (Gossau ZH)
 Switzerland