On Thu, Dec 29, 2011 at 5:39 PM, Blake Crosby <m...@blakecrosby.com> wrote:
> Hello,
>
> I'm currently porting over my mapserver config to geoserver. One spot
> I'm stumped on is dealing with "styling" rasters.
>
> Take this mapserver config:
>
> CLASS
> NAME "elevation"
> EXPRESSION (([pixel] >= %YELLOW1%) AND ([pixel] < %RED2%))
> STYLE
> COLOR 255 255 0 # yellow
> END
> END
> END
>
> YELLOW1 and RED2 are parameters that are sent along with the WMS call.
>
> Does geoserver support these types of rules? I tried using the filter
> option in the Raster Symbolizer, but couldn't get it to work.
>
As far as I know it is not possible to translate that expression into a
GeoServer
equivalent SLD right now.
SLD 1.0 does not have the ability you're looking for, SLD 1.1 might but
we don't support it fully enough to allow what you're trying to do to work.
For the record passing down variables from the request to the SLD
is supported as a vendor extension (it's not part of the SLD standard),
but only in places where the SLD schema allow for an expression,
unfortunately the ColorMap values are not one of them:
http://docs.geoserver.org/stable/en/user/styling/sld-extensions/substitution.html
Getting there would require changes mostly to the geotools code, but
in multiple places. Not a massive amount of work, but not trivial either.
Cheers
Andrea
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