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** This issue is addressed in ArcGIS 9.1 Service Pack 1 (SP1) **
DIGEST rasters, such as ASRP/USRP, do not properly georeference in ArcGIS 9.1. The georeference information is contained in the image format itself but is ignored when the raster is accessed. The spatial reference is not recognized either.
This is a known issue.
Note: This issue is addressed in ArcGIS 9.1 Service Pack 1 (SP1).