I have a few meshes full of bumps and holes that look like this:

I want to modify this surface to fit within a plane so that it will look something like this:
I'm not sure where to go about starting this, though. I just want the edges to be perfectly rectangular, so I can line up several of these side by side to get one big surface where the interface between them nice and straight. Any insight on how I could approach this would be helpful!
