On Thu, Oct 11, 2012 at 9:58 AM, <thomas.wande...@dlr.de> wrote:
> Ok, thank you a lot for this info Andrea…even it is a real downer for
> me L****
>
> I always expected that I can easily filter Raster datasets but it seems
> that thanks to some extensions some more complicated operations are
> possible while this will wait for another standard… ****
>
> What actually is the WCS then for? For me it seems like some very unuseful
> extra standard…at least I haven’t seen any demo that shows the added value.
>
It is the equivalent of WFS, access raw data as opposed to pretty pictures,
RGB ones.
So you can get out a portion of a coverage, reproject it, select bands,
rescale it, and still get it out in its "native" representation
(e.g., 16bit dem, not a colored image).
But it cannot do filtering on top of the pixel values, for that one needs
WCPS.
> ****
>
> ** **
>
> I can clarify my plans a bit more: While styling seems to do exactly the
> things we need (Make certain areas of a raster transparent, for instance
> all elevation above a certain percentage) it works only visually when
> viewing in the map. But our application should combine some exclusion masks
> from an ensemble of raster layers (with a filter applied to them). This
> will be done by a WPS, so we need real filtered datasets and not only
> visually applied styles.
>
GeoServer WPS can handle raw coverages as well, and has direct access to
the raw data when you refer to the internal WCS as the
source, one could create a process that does the filtering based on the
raster content
Cheers
Andrea
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