I think this proposal makes sense, so the expressions you expect to change
based ... only on env functions? I am trying to think of any attributes or
properties that are associated with raster as a whole, or change gradual by
gradual in a mosaic.
No problem with the approach, I think at this stage introducing expressions
where constants are used in the spec is a safe strategic direction way to
extend for our styling model.
--
Jody Garnett
On Mon, 21 May 2018 at 10:41, Andrea Aime <[email protected]>
wrote:
> Hi,
> currently raster symbolizer supports expressions in many places (as
> extensions to the SLD core model).
> However, it's not yet possible to parameterize (via env function) the
> channel selections, the source channels
> are fixed strings:
>
>
> https://github.com/geotools/geotools/blob/865cc72a90b07841a4c871d1b07fcc8e5defd35b/modules/library/opengis/src/main/java/org/opengis/style/SelectedChannelType.java
>
> https://github.com/geotools/geotools/blob/865cc72a90b07841a4c871d1b07fcc8e5defd35b/modules/library/api/src/main/java/org/geotools/styling/SelectedChannelType.java#L37
>
> The idea is to switch the channel name to Expression and adapt the code
> accordingly.
> I believe it's uncommon to actually set and get the channel name by code,
> so I was thinking to do a clean break and just switch the String into
> Expression, with the following mitigations:
>
> - Have style factory methods keep on working with strings too (adding
> one new method accepting a string)
> - Do the same with the gt-brewer style builder (the other, older one,
> does not even have a way to do channel selection)
>
> I will of course build a proposal, but wanted to double check if the
> direction I'm going is suitable for everybody.
> Ah, backport is not planned.
>
> Cheers
> Andrea
>
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