[Qgis-user] styling type

[Richard McDonnell]

Hi Noëmi

In relation to styling and speed, it depends on:

  *   the complexity of the rules
  * Indexing the fields you are using for styling.

As to comparison between Rule based and Categorising, they would both be 
pretty much the same, I often utilise categorising to initially style a 
layer, and then change it to a Rule Based, for fine tuning.
They are basically the same thing, but rule based offers you a little 
more control. Again, the complexity of the style and how well you have 
indexed your database makes a difference.

Regards,

Richard.



On 31/01/2018 07:02, Sturm Noemi wrote:
>
> Hi Lene
>
> Thank you for your answer.
>
> Actually I would like to know if either rule-based styling or 
> categorized styling renders faster.
>
> e.g.
>
> Postgis-Layer with attribute "size". Attribute values of "size" are 
> "small", "middle", "big".
>
> In categorized I would categorize by "size". In rule-based I would 
> write 3 entries like "size" = 'small'.
>
> Regards,
>
> Noëmi Sturm
>
> *Von:*Lene Fischer [mailto:lfi at ign.ku.dk]
> *Gesendet:* Dienstag, 30. Januar 2018 21:35
> *An:* Sturm Noemi <Noemi.Sturm at bd.so.ch>; 'qgis-user at lists.osgeo.org' 
> <qgis-user at lists.osgeo.org>
> *Betreff:* RE: styling type
>
> Hi Noëmi,
>
> Use Classifying
>
> Look at QGIS training manual: 
> https://docs.qgis.org/2.18/en/docs/training_manual/vector_classification/index.html
>
> Or  Klas Karlssons multiple videos
>
> https://www.youtube.com/results?search_query=klas+karlsson+qgis+style
>
> Or mine (in danish ;-))
>
> https://www.youtube.com/watch?v=y8XwTs5nM20
>
> Regards
>
> *Lene Fischer*
>
> Associate Professor
>
> *University of Copenhagen*
>
> Department of Geoscience and Natural Resource Management
>
> Forest and Landscape College
>
> Nødebovej 77a
>
> 3480 Fredensborg
>
> Denmark
>
> MOB +45 40115084
>
> lfi at ign.ku.dk <mailto:lfi at ign.ku.dk>
>
> mailbox:///G:/MailArchive/Inbox.sbd/Filtered%20Mail.sbd/02-QGIS%20Mailing%20List?number=506087&header=quotebody&part=1.1.2&filename=image001.png 
> <@Lene_Fischer>
>
> *From:*Qgis-user [mailto:qgis-user-bounces at lists.osgeo.org] *On Behalf 
> Of *Sturm Noemi
> *Sent:* 30. januar 2018 07:26
> *To:* 'qgis-user at lists.osgeo.org'
> *Subject:* [Qgis-user] styling type
>
> Hi
>
> I'd like to style objects of a postGIS-Layer upon values of a single 
> attribute. Which styling type (rule-based or categorized) should I use 
> in respect of rendering performance (QGIS 2.18 and QGIS Server 2.18) ?
>
> Thanks,
>
> Noëmi Sturm
>
>
>
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-- 
*_Richard McDonnell_*
*GIS Specialist PgD GIS AssocSCSI*
*OPW FRM Data Management*
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