Hello.

I am receiving a series of geotiffs (radar images) once every few minutes.  I 
am adding the updated images into GeoServer via the REST interface.

I want to present these images as a single layer in GeoServer, and I'm 
wondering how to select between using a layer group and an image mosaic.  I've 
hit some roadblocks with both approaches, though overall I've had more success 
with image mosaics.

My problem with image mosaics: In GeoServer 2.0.2, it doesn't seem like I'm 
able to update an image mosaic.  (When I do a PUT for an existing mosaic, the 
shape files for the mosaic are not updated.)  So, I'm removing & re-creating 
the mosaic every time I get a new image, and I wonder how well this approach 
scales.  Does re-creating the mosaic become more expensive as we add more 
images to it?

My problem with layer groups: I have not been able to figure out how to specify 
transparency in a layer group of plain geotiffs.  Using an image mosaic, I can 
PUT XML like http://pastie.org/1871543 to set the transparency color.  I 
haven't had any success doing this using either a plain geotiff or a layer 
group.

I'd really appreciate any insights on:
 * Selecting whether I ought to be solving this problem with layer groups or 
image mosaics.
 * Helping me resolve one or both of the issues I mentioned above.

Thank you very much!

alex
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