I'm not sure we're talking the same thing, but VistaPro is able to import a
number of graphic files and manipulate and convert them into *.dem format.
Hope I'm not leading you up the wrong alley!
Joseph
There are DEMs available en masse on the Internet, and the easiest way to get a
pile of them these days is to buy a program like Vista Pro, which comes on a
CDROM with hundreds of DEMs.