Divide surface

I´m trying to make the mesh a surface and split the surface into two, so I can delete the part that is outside the green outline. (the yellow part). Do you have any ideas?


Topografía.gh (201.9 KB)

Here is one idea:
Topografia_v2.gh (197.8 KB)
FYI, when working so far away from the origin, you can run into some issues.
https://wiki.mcneel.com/rhino/farfromorigin

You are trying to trim a mesh and not divide a surface…

“Topography problem” would be a more accurate topic title.