Have a look at how mosaic works. 

--
Jody Garnett

On 26/07/2013, at 12:35 AM, Jan De Moerloose <jan.demoerlo...@geosparc.com> 
wrote:

> Sorry, wrong list. I reposted to users.
> On 25/07/2013 15:55, Jan De Moerloose wrote:
>> Hi,
>> 
>> i have a collection of coverages with different envelopes and want to
>> merge that into a single coverage for rendering. Is there some
>> functionality in geotools to do that, taking into account that i would
>> like to calculate the value in a point of overlap in a rather custom
>> way, not just taking the value of the top coverage but instead taking
>> the sum, weighted average etc of the different coverages.
> 
> 
> -- 
> Sincerely,
> Jan De Moerloose
> 
> Geosparc n.v.
> http://www.geosparc.com
> sponsor of http://www.geomajas.org
> 
> 
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