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Plotting model data in sigma coordinates

I am trying to use ferret to visualize output from a sigma coordinate ocean
model. The model has 20 levels everywhere, but at every x-y location the depth
of those levels is a function of the total depth at that position. Currently,
this is handled by transforming the sigma coordinates to a grid with regular
depths, but I would much prefer to be able to work with the data at the correct
depths - not just so the bottom is portrayed correctly.

Has anyone done this before, or does anyone know of a way to do this?

Of course this is also complicated because the x-y locations are irregular.

	Thanks, Mark Verschell


	      Mark Verschell (markv@coaps.fsu.edu)
	      Center for Ocean and Atmospheric Prediction Studies
	      020 Love Building
	      Florida State University
	      Tallahassee, FL  32306-3041
	      (904) 644-6532
              (904) 644-4841 (fax)

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