[Qgis-developer] Suppress rendering of small features

Andreas Neumann a.neumann at carto.net
Wed Sep 11 23:51:43 PDT 2013


As I understand, the feature to suppress small/large features would be

Another interesting thing would be to simplify features when you zoom
out. Maybe simplifying would be quicker than rendering thousands of
unnecessary vertices. Optionally this could also be "outsourced" to the
database - many databases support simplification on the db level. I
don't know if it would really speed up things. One would have to test.


Am 12.09.2013 07:57, schrieb aperi2007:
> Not always is preferrable to suppress the small features.
> Often in our rendering we prefere to substitute a small rendering of
> kind polygon with a point rendering at lowest scales.
> This is possible using the Rule-Rendering
> also is possible to use the rule-rendering to define a rule that in a
> scale interval and with a dimension interval the feature is render using
> a point rendering and change in a polygon rendering when the scale grow.
> Andrea.
> On 12/09/2013 02:13, Nyall Dawson wrote:
>> Hi all,
>> I've been chatting with Nathan about adding a feature to QGIS which
>> would allow suppression of rendering features smaller than a set
>> threshold for vector layers. (There's already a similar function in
>> the labelling engine "Suppress labeling of features smaller than").
>> This feature would come in handy for me for several tables which
>> contain a wide range of very small -> very large features, which cause
>> slow rendering at small scales.
>> I'm just checking that if I code this up it's not going to be
>> duplicated effort - Nathan is under the impression that someone else
>> has been talking about adding something similar. Is there currently
>> any plans for a feature like this, or should I get started?
>> Nyall
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