How to subtract two sets of contour lines?

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09-25-2012 10:07 AM
MichaelKeener
New Contributor
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.
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BruceNielsen
Regular Contributor
I would use the Topo to Raster tool in Spatial Analyst to create a raster from each of your contour layers, then calculate the difference using the raster calculator.
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