There is an example in the geoserver code base; one that allows direct access 
to a raster file so it can be exported. 

As for the general answer I think that GridCoverage2D is the wrong object (it 
is the answer to a question; GridCoverageReader is the thing you are asking the 
question of which would know about the file). 

-- 
Jody Garnett


On Friday, 2 September 2011 at 12:56 AM, Scott Ellis wrote:

> Hi, I am writing a WPS method which takes a GridCoverage2D object as
> input. Is there a way to get the local file for that if it is a raster
> layer registered with GeoServer?
> Thanks,
> Scott
> 
> 
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