algorithmic modeling for Rhino
This approach doesn't do edges, but if you need those you can always add some boundary points well outside your grid and well below the 0-level when you create the mesh.
I also don't pull the final polylines onto the points, the vertices are slightly off, as I intersect the mesh at an elevation of 0.9999. You can add that by getting the polyline vertices and pulling them all to the original point set.
 edges.gh, 8 KB
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Grasshopper
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