Spline patching would work great, but you still need to know how high each spline needs to be. I suppose thats contained in the topo though. Just remember patches need to be composed of 3 or 4 splines. You could also paint a grayscale image over your topo lines in Photoshop or something like it to match the contours and use it as a displacement map. Either way sound like it might still be a pain.
Maybe you can find a DEM on the web of the area and just use that. I did that for a project very much like what your trying to do here.
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