On Thu, Dec 29, 2016 at 2:56 PM, Bennos <[email protected]> wrote:
> Is it possible to get the field values from the original features after
> using
> the PointStacker? At least for features that are not in a stack (or the
> stack == 1)?
>
> I managed to succesfully stack my points using the example SLD from [0].
> When there is only 1 point in a stack I want to show an external Graphic
> which is dependent off an attribute.
>
> <OnlineResource xlink:type="simple" xlink:href="icons/${code}.png" />
>
> As I understand the source code on [1] the attributes are not forwarded
> through the transformation (for reasons I can understand), thus my dynamic
> display wont work. Now I wanted to ask if there is a solution existing,
> which allows me to get the needed attributes.
>
Hi,
your assessment is correct, there is no way to get that information out.
The expectation in Geotools/GeoServer is a feature collection has a uniform
schema,
that is, all feature have the same attributes, what you want instead would
be a summary
for points that are actually stacked, and the full attributes for the
isolated ones.
Going out of that path might or might not work, I'm not sure, one would
have to try it out...
you could create a collection of yours that does not enforce the uniform
schema rule (or
see if a built-in one does not care, at your risk since the behavior might
change tomorrow)
and then verify if the collection can reach to the renderer without
alteration (sometimes
they do get wrapped, again, might work today and break tomorrow).
An idea that you might try is to add a last field in the returned features
that contains
another feature, which would be null in case of a stacked point, and the
original feature
in case of a isolated feature. This also goes a bit outside of the normal
rules and
I cannot guarantee it would work, but it's worth trying.
>
> There is one thing I don't really understand: There is a question by Cesare
> on gisSE [2] addressing a similar issue but for a GetFeatureInfo where
> there
> are attributes visible in his screenshots - are they coming from the
> PointStacker or are they from somewhere else?
>
Don't know
Cheers
Andrea
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