How to subtract two sets of contour lines?

Discussion created by sd70mike on Sep 25, 2012
Latest reply on Sep 25, 2012 by bruce.nielsen
I'm working with 2 different sets of contour lines and I want to subtract one from the other and make a new contour map from that.  It seems simple.  I have two set of lines with an elevation attribute and wherever they cross is a point that contains the difference in that elevation.  Then, I create a contour map from those points.  Is there a way to do this with some kind of function because manually placing points takes too long?  I've tried the raster calculator but my data is not in a raster format.  Any help is appreciated.