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

[A Huarte]

+1


>________________________________
> De: Mathieu Pellerin <nirvn.asia at gmail.com>
>Para: Tim Sutton <lists at linfiniti.com> 
>CC: A Huarte <ahuarte47 at yahoo.es>; qgis-developer <qgis-developer at lists.osgeo.org> 
>Enviado: Miércoles 22 de enero de 2014 11:41
>Asunto: Re: [Qgis-developer] On the fly simplication of point layers
> 
>
>
>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
>>>>> ==============================================
>>>>>
>>>>>
>>>>
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>>
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