For part of a school asignment, I have to model a topographic map. I thought I'd just scan the map, and draw curves for all of the map then set the to the correct elavation. However, I can't loft them. Certain parts of the map wont allow for it.

It's not a problem with the curves or anything. I just need to know another way to make the map. As long as it doesn't involve lofting, it's fine.