Why not just put some catalog identifier as an attribute in your mosaic layer. 
I still would think with that many images there were some logical groupings. 
That said you could easily filter with the catalog identifier and get the 
desired result. 

--Paul 

On Feb 26, 2012, at 7:52 AM, "DrYSG" <ygutfre...@draper.com> wrote:

> I apologize, I left out an important point.
> 
> We do not plan on the users to directly access the WMS server. Instead,
> there is a meta-data catalog of all images kept in a CS-W compatible
> catalog. Users will first search here (and filter based on location, and
> other metadata attributes) and the result list will be return which then
> will be used to fetch images from the WMS server. This means we have a lot
> of flexibility to return well crafted URLs to send to either the WMS server
> or our intercept proxy and to specify the exact set of images desired.
> 
> There are a couple of advantages to this architecture:
> 
> 1. The catalog server has better indexing and filtering tools to rapidly
> sub-sample the 20M records to just a few (and return them in rank for
> mosaicing).l
> 2. We can provide dynamic sorting akin to ArcGIS Server Image Extensions
> 3. Less burden on GeoServer (we suspect that our catalog server is better
> designed for this sort of searches)
> 
> You might ask why we need the WMS server? Good Question. If the client can
> consume the set of images straight from an HTTP server, that would be fine.
> But there are clients that are only set up for WMS and WCS overlays, as well
> as some useful tiling and re projection services that the WMS server
> provides.
> 
> This is also a reason why we did not really spend a lot of time thinking
> about GetCapabillites on the WMS server. We don't see this as the entry
> point. We see the catalog server returning a GetMap URL directly.
> 
> 
> --
> View this message in context: 
> http://osgeo-org.1560.n6.nabble.com/20-Million-Image-files-tp4503489p4510284.html
> Sent from the GeoServer - User mailing list archive at Nabble.com.
> 
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