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

[Mathieu Pellerin]

Tim, I think that type of simplification should not be activated by
default. The risks of users just not knowing what's going on is high.

The discarding should be activated via check box when desired.
On 21 Jan 2014 12:01, "Tim Sutton" <lists at linfiniti.com> wrote:

> Hi
>
> Sent from my mobile
> On 21 Jan 2014 3:10 AM, "Mathieu Pellerin" <nirvn.asia at gmail.com> wrote:
> >
> > Also, that logic can only be applied for fully opaque point symbols. As
> soon as you have a semi transparent symbol, the repetition of points over a
> same map pixel does matter and needs to be preserved.
>
> Agreed but in that case surely you would just disable simplification?
>
> Regards
>
> Tim
> >
> > On 21 Jan 2014 07:46, "A Huarte" <ahuarte47 at yahoo.es> wrote:
> >>
> >> Ok, I will study 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
> >>>>>>> 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
> >>>>>>> ==============================================
> >>>>>>>
> >>>>>>> _______________________________________________
> >>>>>>> Qgis-developer mailing list
> >>>>>>> Qgis-developer at lists.osgeo.org
> >>>>>>> http://lists.osgeo.org/mailman/listinfo/qgis-developer
> >>>>>>>
> >>>>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>> --
> >>>>> 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
> >>> ==============================================
> >>>
> >>>
> >>
> >> _______________________________________________
> >> Qgis-developer mailing list
> >> Qgis-developer at lists.osgeo.org
> >> http://lists.osgeo.org/mailman/listinfo/qgis-developer
>
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