[Qgis-developer] On the fly simplication of point layers

[Tim Sutton]

Hi


On Tue, Jan 21, 2014 at 12:11 AM, A Huarte <ahuarte47 at yahoo.es> wrote:

> And, I wrote my reply wrong :-)
>
> About point simplification, the strategy is no fetch in the
> featureiterator some points using a tolerance.
> Do you think that I must try it ?
>

If you have time and inclination this would be great (note feature freeze
starts in 4 days). A logical starting may be to only return one point per
map pixel though I am not sure if you can push that kind of logic over to
provider side very easily.

Regards

Tim


>
>
>   ------------------------------
>  *De:* Tim Sutton <lists at linfiniti.com>
> *Para:* A Huarte <ahuarte47 at yahoo.es>
> *CC:* qgis-developer <qgis-developer at lists.osgeo.org>
> *Enviado:* Lunes 20 de enero de 2014 22:57
> *Asunto:* Re: [Qgis-developer] On the fly simplication of point layers
>
> Hi
>
>
> On Mon, Jan 20, 2014 at 11:47 PM, A Huarte <ahuarte47 at yahoo.es> wrote:
>
> done:
> https://github.com/qgis/QGIS/pull/1093
>
> This patch hides the simplification rendering tab for point layers, now
> it is not supported (internally I am not trying to simplify point layers)
> . Thanks Tim!
>
> About if there is a use case for point simplification, I know one, (gvSIG
>  + dielmo open lidar) use it for load extreme big point layers as LiDAR LAS
> files are.
>
> It know the code in java and I think easy migrate to QGIS. Basically, It
> ignore points by distance in a similar style as the current simplifier
> classes.
>
>
> Sorry I see my original email was not very clear - I meant if there was a
> use case for point simplification as *currently implemented in master* - I
> fully agree that filtering proximal points would be a good performance
> booster, as would providing a point clustering capability.
>
>
>
> If you think good for QGIS I think but I can imlement it
>
>
> That would be great! Thanks for your pull request.
>
> Regards
>
> Tim
>
>
> .
> Alvaro
>
>   ------------------------------
>  *De:* Tim Sutton <lists at linfiniti.com>
> *Para:* qgis-developer <qgis-developer at lists.osgeo.org>
> *Enviado:* Lunes 20 de enero de 2014 21:29
> *Asunto:* [Qgis-developer] On the fly simplication of point layers
>
> Ok I guess you can see where I am going to go with this email :-) Is there
> any point to allowing users to simplify point layers? Alvaro, can your
> remove the point rendering tab in layer properties (and I guess check
> internally that you are not trying to simplify point layers)? Or is there a
> use case for point simplification that I am not getting?
>
> Regards
>
> Tim
>
> --
> Tim Sutton - QGIS Project Steering Committee Member
> ==============================================
> Please do not email me off-list with technical
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>
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> ==============================================
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>
>
>
>
> --
> Tim Sutton - QGIS Project Steering Committee Member
> ==============================================
> 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.
>
> Irc: timlinux on #qgis at freenode.net
> ==============================================
>
>
>


-- 
Tim Sutton - QGIS Project Steering Committee Member
==============================================
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.

Irc: timlinux on #qgis at freenode.net
==============================================
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