Thanks for the answer. Actually, Im just new to use this image server. Here i clarify that i want to do case number (2):
Use DTED to do orthorectification of aerial or satellite imagery.
I have created a DTED ISDef, and publish it, but not yet create and ISRef. I try to search the tutorial to do this, but not found yet. Is it any tutorial or manual to me refer to? My work is using 9.3 version.