> So instead I look for a method to generate isosurfaces from my
> 1-square-degree earth surface slices... I think it would start with a
> pigment function derived from the original elevation heightfield (which
> I also had to generate from DEM data in a non-POV format)... but this
> pigment would be an imagemap constrained to a certain geographical
> region of a sphere rather than simply mapped around the sphere.

   Maybe my HF2ISO experiments can give you some ideas (except for the 
spherical part):

http://www.ignorancia.org/en/index.php?page=Heightfield_based_Isosurfaces


--
Jaime

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