Spectral analysis

Hi there,

Has anybody out there written any program to do Spectral analysis
of GIS maps or knows somebody who has looked into this method of
map analysis.
I would like to look into this technique to get a measure of information
content in the map. Any references, tips, books etc. would be welcome.
Thanks for the help.

Dinendra R.

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GIS LAB
UNIVERSITY OF OKLAHOMA
NORMAN