I'm not sure exactly what type of contour mapping you want, but for the
contour mapping I do there's a program called Transform (part of the
SpyGlass series) that does a nice job on the mac. The group that wrote
it is originally out of one of the supercomputer centers, though now
they are a commercial outfit. The address is Spyglass Inc., 701
Devonshire Dr., C-17, Champaign, IL 61820.
There are also several IBM programs that do contour plots. I believe
you can also do them in some of the more general purpose math packages
such as Matlab and Mathematica.
Dept of Zoology, Univ of Washington
meir at zoology.washington.edu