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Congrid but with shift of origin

Hello group,
   I need idl code to resample an array that is a digital terrain model 
and often need the origin to be shifted by fractions of a cell in x and 
y directions.  Congrid cannot handle the latter, as I read the 
documentation.  I'll bet someone has a program that does this.  Can some 
one point me to such help.

Joseph E. Means
Assistant Professor,  joe.means@orst.edu
Department of Forest Science
Oregon State University
Corvallis, OR 97331-5752