generative modeling for Rhino
do you want to get a Srf model? If yes, sort the lines by the z-value and loft them (does not work this easy if you have more then one hill).
otherwise defineinconsistent in this contaxt. I maybemissunderstand you.
Lofting won't work, as these contour lines do not have consistent topology. Some contours may be closed, while others are open. Some contours will consist of a single curve whereas others consist of a group of curves at the same elevation. Lofting can only be applied to a setof curves that have the same topology.
To do from this to a Nurbs surface pretty much your only option is to 'fit' a surface to the contour data. There's two ways that spring to mind: