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Extracting a 2D surface from a 3D field

Fellow Ferreters,

Here is a problem I can't solve with Ferret yet, I hope someone can:

I have a 3D (x,y,z) field of oceanic temperatures, temp. I want to select
values of temp on some surface, which is neither a constant depth nor an
isotherm: that surface is a  2D (x,y) array of depth values, independant
from temp. I simply can't find a way to do that.

Any hint will be welcome.


       Dr. Gerard ELDIN,          Tel: 00 5 61 33 28 72
       IRD, LEGOS/GRGS,           Fax: 00 5 61 25 32 05
       18 Av. Edouard Belin,
       31401 TOULOUSE CEDEX 4     Gerard.Eldin@cnes.fr
       FRANCE                     or     eldin@ird.fr

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