There is also a bug logged for this with the workaround that mike wrote. NIM056429 - Raster Catalogs cannot be added from a Geodatabase in ArcGIS Explorer. Workaround 1. Right Click on the Raster Catalog in ArcCatalog. 2. Click �??Create Layer�?? and save the layer file. 3. This layer file can be added to ArcGIS Explorer using the Add Content -> ArcGIS Layers option.
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