Thanks for the reply Alan, Yeah I saved the file aquired per the instructions on the link you mentioned which specified to save file as " usgs ascII dem " and then place this file in the :
"DEM Directory (set in Options->Preferences in TopoFusion, the program directory by default)."
Which I took this to mean to save the "usgsII dem " in the main TopoFusion . Â I was hoping to see something in the topofusion file like a DEM Directory file or something but the only thing in TF like that is a file called "dem data " and thats a data file that won't allow anything being dumped into it.
It was only when I saved that "usgs ascII dem" in the 3dem file that I got it to come up.
so what have I done wrong?