David,
I believe m.rot90 will do the trick, but if not you could take
the original unreferenced tif files and rotate them in XV. XV was
developed by John Bradley and is a quite useful all-purpose graphic tool.
If you need some info on how to get XV, just let me know!
Have great day,
--
R. Brian Culpepper Research Specialist
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Center for Advanced Spatial Technologies (fax) 501 575-5218
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University of Arkansas brian@cast.uark.edu
Fayetteville, AR 72701