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Thanks MrTom! I appreciate your help!

This is close to what I want. It looks like what you've done is have the line be the negative of what's below it. What I would like to do it have the line just be slightly lighter (or darker) that what ever is directly below it.

Maybe I should explain more precisely what I'm doing, which might help. This is a heightmap taken from SRTM data available online. I use the heightmap to create a 3D model then carve it into wood with a CNC router. What I want to do is be able to overlay other data (boundaries, roads, trails, etc) and have those lines be raised on the 3D model. I'm sure there are other ways to do this with the modeling software, I'm researching that elsewhere.

Hope that clears things up.

Thanks again!

Dan