Dear geotoolers,

I would like to apply a neighbourhood sum operation on a coverage (ie.
like focalsum in esri parlance) using (a) a circular mask and (b) an
arbitrary but spatially contiguous neighbourhood.

I'm sure it iust be simple to create a mask and move it over the
coverage but I've become a bit lost in the api docs for the coverage
and operationxxx classes, so I'd be grateful if someone could point me
in the right direction.

I'm working with gt 2.5

cheers
Michael

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