Re: [Geoserver-users] How to publish data to better geoserver performance

[<chr...@nv...>]

Zitat von Andrés Maneiro <ama...@ic...>:

> On 15/06/11 19:48, chr...@nv... wrote:
>> No, this is not possible, but it would not really increase performance.
>>
>
> My assumption was that converting a polygon into a point will be an
> extremme case of simplification / generalization.

But this changes the topology. A point is an invalid polygon. Things  
get more complicated.
>
> I mean, I suppose that simplification is useful because as the polygon
> have less vertex is less computer-intensive. Following that reasoning,
> computing a point should be less intensive than a polygon with a lot os
> vertex.

This is correct. But AFAIK the rendering code used by geoserver tries  
hard not to draw
a pixel multiple times.  If the distance between to vertices is  
smaller than a pixel, the second vertex is not drawn.
>
> Could someone confirm this? If I'm wrong, I'd rather not working on
> generating the points and saving so a lot of time.

In your case, I would save my time. Look at the results, if the  
performance is slow, you have still
the possibility to add points.

>
>> Sometimes simplifying a geometry produces an error, you must use the
>> next finer level instead.
>>
>> But if you like, you can add a point geometry column to your postgis
>> table and switch in the SLD.
>>
>
> Yep, that's very useful, thanks. I've just discovered these days the
> technique explained here:
> http://docs.geoserver.org/stable/en/user/styling/sld-tipstricks/mixed-geometries.html#separate-geometry-columns

Yep.

Cheers
Christian
>
> best,
> amaneiro
>
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