Hi,
I have not played yet with Geoserver SQL View layers and I do not know how
flexible it is, but perhaps it could be made to select geometries through
ST_Simplify http://www.postgis.org/docs/ST_Simplify.html
Geoserver SQL view could contain SELECT ST_Simplify(geometry, %tolerance%) AS
geometry and if users could send %tolerance% as a variable then the result
should be close to what you want.
-Jukka Rahkonen-
________________________________
Lähettäjä: Justin Deoliveira [mailto:jdeol...@opengeo.org]
Lähetetty: 15. kesäkuuta 2012 21:49
Vastaanottaja: Andrea Aime
Kopio: Biskup, Paul; geoserver-users@lists.sourceforge.net
Aihe: Re: [Geoserver-users] GeoServer pregeneralized features extension with
OpenLayers
One idea i had while implementing stored queries for wfs 2.0. Just like
rendering transformations in sld are the bridge between wms and wps, storied
queries could the bridge between wfs and wps. I think they line up pretty
well...stored queries essentially give you a way to call a known procedure
plugging in parameter values. Anyways, just a thought, surely something that
would have to be fleshed out and unfortunately would only work for wfs 2.0.
On Fri, Jun 15, 2012 at 10:03 AM, Andrea Aime
<andrea.a...@geo-solutions.it<mailto:andrea.a...@geo-solutions.it>> wrote:
On Fri, Jun 15, 2012 at 3:35 PM,
<christian.muel...@nvoe.at<mailto:christian.muel...@nvoe.at>> wrote:
> Hi Andrea
>
> I am with you, the first target is to be compliant to the specifications.
> WPS would be a clean solution.
Mind, I'm not saying that WFS should be left out of the game, but that
there should be
some solution that cleanly extends WFS and open the door to all kind
of transformations,
instead of having an increasingly brittle set of extra addressing all
the possible use
cases where WFS fails to satisfy the user needs.
One example is rendering transformations, we set them up to allow
mixing processing
and styling in an open ended way and it is bearing fruits, other
people is adding
support for heatmaps, point clustering, on the fly scattered point
interpolation and
so on based on such mechanism.
Something similar for WFS would imho be acceptable, a convenience to apply
on the fly one of many available processes to the WFS output, transforming its
structure into something different.
Could be seen, for example, as a custom output format, configurable in some way,
like for example the discussions we have seen in the past where people would
like to have a XSLT based output format for GeoServer. It's not there yet, but
it's not bad per se, because it's an open ended mechanism that allows
for future growth.
What would worry me would be an output format that does a custom
transformation instead,
because we'd end up with a billion of them (anybody is free to
implement the custom
one btw, it's just not material for the public GeoServer code base imho).
Cheers
Andrea
--
Ing. Andrea Aime
GeoSolutions S.A.S.
Tech lead
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mob: +39 339 8844549<tel:%2B39%C2%A0339%208844549>
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http://geo-solutions.blogspot.com/
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http://www.linkedin.com/in/andreaaime
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Justin Deoliveira
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Enterprise support for open source geospatial.
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