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I've got a Geoserver raster layer which represents a satellite image. I use the Geoserver WMS to display the raster in OpenLayers. I want to display only parts of the raster - those within a certain region.

Is it possible to send a parameter to the server (like a bbox, or a CQL expression), which will tell it to render only within a polygon?

Can i make any 'tweaks' in OpenLayers to accomplish this behavior? For vector layers I can use a cross-layer CQL filter in the WMS request, but what to do with a raster?

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