Yes, that's one common use case, the other is the before and after use case with a swipe tool. You can compare the before and after using a tool that swipes between the two coverages.
On Tue, Dec 22, 2009 at 8:39 AM, Andrea Aime <[email protected]> wrote: > sophia parafina ha scritto: > > What happens if you have 2 or more coverages in the map context? >> > > In general, the others would be drawn with the current method, that > incurs in a scalability issue (synchronization deep in the java2d > libraries). > > However, my guess is that at most you'll end up piling a group > of coverages at the bottom of the map context, and add all of the > vector layers on top of it. > > If it is so, we could have the code loop over the layers bottom > to top and try to use an optimized path as long as the next > layer is still a coverage. > I guess, but I'm not sure, that we can perform some fast JAI > image composition without going down in java2d as long as we > just need to merge together coverages. > > Out of curiosity, what is the common case of mixing multiple > coverages in a single result? > > One that comes to mind for me is depicting a DEM using a colormap > driven base layer and a aspect layer that is drawn on top of it, > grayscale with partial transparency, to provide the illusion of > shadows > > > Cheers > Andrea > > > -- > Andrea Aime > OpenGeo - http://opengeo.org > Expert service straight from the developers. >
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