Thanks for suggestions. Dems are all in a folder now. Guess I don't know how to iterate through workspace. Have tried using Modelbuilder also but no better result. Am using Arc10.
I'm trying to do something very basic, I think, namely convert multiple USGS 7.5 min dems to raster. Tried using iterate multivalue in modelbuilder but it seemed to process only the last dem in the list.
Any suggestions?