Agreed. I was mostly thinking of the ability to be able to use the "env"
function - I should have said that explicitly.
It seemed like the cleanest, most general way of providing access to "env"
was to allow CQL expressions (especially since there might well be the need
to perform some further computation on the "env" value to adapt it to the
quantity required for any particular band).
On Mon, Jan 7, 2013 at 10:31 AM, Andrea Aime
<andrea.a...@geo-solutions.it>wrote:
> On Mon, Jan 7, 2013 at 6:57 PM, Martin Davis <mda...@opengeo.org> wrote:
>
>> I don't think this is possible at the moment. The problem is that the
>> quantity value is supplied by an attribute, rather than a sub-element
>> (where it would be possible to allow a filter expression instead of a fixed
>> value.
>>
>> The ColorMapEntry element is actually a bit of an anomaly in SLD - most
>> parameters in other styling elements are supplied as element content,
>> rather than attributes. A nice extension for GeoServer would be to allow
>> CQL expressions in attribute values in SLD.
>>
>
> Hmm.. let's say the reason for the usage of the attribute is not so
> difficult to imagine, rasters have
> no "attributes", so theoretically there would be nothing to write an
> expression against, standard wise.
>
> GeoServer has the env function though, that one would indeed be usable as
> a source of values for
> the color map
>
> Cheers
> Andrea
>
>
> --
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>
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