On Sun, Nov 25, 2012 at 12:06 PM, Ákos Maróy <[email protected]> wrote:
> Hi,
>
> I wonder if there is a 'group by'-style filter in SLD?
>
> What I'd like to do is to create a union of a number of inter-related
> geometries, and render the union of them. one way to go at it would be
> to be able to group the geometries by one of their properties, which
> would have the same value for the geometries in the same group. then I
> could apply a union function on such a group of geometries.
>
> Is there something similar available in SLD?
>
Nope, standard SLD does not allow anything like real geometry unioning.
What Edward suggested works if all you want to do is filling the geometries
with the same color, without drawing an outline and labeling them.
Going out of the standard it's technically feasible to perform union-ing on
the
fly using a rendering transformation, but we don't have a "Dissolve" process
right now (and writing one that is not fully memory bound but still provides
rendering worth performance is not trivial either, we'd need some sort
of smart caching).
Anyways, the rendering transformation topic is covered here:
http://docs.geoserver.org/latest/en/user/styling/sld-extensions/rendering-transform.html
Cheers
Andrea
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