[Qgis-user] styling type

[Sturm Noemi]

Hi Richard

Thank you for your quick and helpful answer.

Regards,
Noëmi

Von: Richard McDonnell [mailto:richard.mcdonnell at opw.ie]
Gesendet: Mittwoch, 31. Januar 2018 10:09
An: Sturm Noemi <Noemi.Sturm at bd.so.ch>; 'Lene Fischer' <lfi at ign.ku.dk>; 'qgis-user at lists.osgeo.org' <qgis-user at lists.osgeo.org>
Betreff: Re: [Qgis-user] styling type

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><mailto:Noemi.Sturm at bd.so.ch>; 'qgis-user at lists.osgeo.org<mailto:qgis-user at lists.osgeo.org>' <qgis-user at lists.osgeo.org><mailto: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>




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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<mailto: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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