Hi,
the SLD schema does not allow to specify a function inside the channel
selection, we have extended bits
and pieces in raster symbolizer to work off expressions, but I don't think
channel selection is one that got
worked on, I had a quick pick at the SLD parsing code and it appears to
only work off a simple name.
If you are interested in having that supported, see this process:
https://github.com/geoserver/geoserver/wiki/Successfully-requesting-and-integrating-new-features-and-improvements-in-GeoServer
Cheers
Andrea
On Tue, Apr 10, 2018 at 3:06 AM, Roboubi, Shahin <
srobo...@mdacorporation.com> wrote:
> This is a cross-post from https://gis.stackexchange.com/
> questions/278774/variable-substitution-in-sld-for-geoserver-2-13-
> rastersymbolizer-channelselectio as I was told that this may be a better
> place to ask this question:
>
>
>
> I'm trying to publish a layer with a style that allows the extended WMS
> request to specify what image bands to map to the RGB values. Based on
> existing examples I assumed that my SLD should have something like the
> following RasterSymbolizer element:
>
>
>
> *<RasterSymbolizer> *
>
> * <ChannelSelection>*
>
> * <RedChannel> *
>
> * <SourceChannelName>*
>
> * <ogc:Function name="env">*
>
> * <ogc:Literal>redchan</ogc:Literal>*
>
> * <ogc:Literal>1</ogc:Literal>*
>
> * </ogc:Function>*
>
> * </SourceChannelName>*
>
> * </RedChannel>...*
>
>
>
> But the SLD validation fails with the following error:
>
>
>
> *Element 'SourceChannelName' is a simple type, so it must have no element
> information item [children]*
>
>
>
> I am following this documentation:
>
>
>
> http://docs.geoserver.org/stable/en/user/styling/sld/
> reference/rastersymbolizer.html http://docs.geoserver.org/
> stable/en/user/styling/sld/extensions/substitution.html
>
>
>
> Is there a way to do this or is it not supported for the ChannelSelection
> element? Are there any more examples and/or documentation for SLD variable
> substitution that I can look at?
>
>
>
> Thanks,
>
> Shahin
>
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Regards,
Andrea Aime
==
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Ing. Andrea Aime
@geowolf
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