There is an error in the Help documentation for ArcGIS Desktop 9.4 beta. Under the section "Raster Data Organization" the help states the following for the Raster Catalog sub section: There are many geoprocessing tool specifically for working with raster dataset. These are listed in An overview of the Raster toolset's Raster Catalog tools. This line should be read as 'There are many geoprocessing tool specifically for working with raster catalog.'