FEM to FD

Sometimes we have a finite difference grid and we need to obtain from it a finite felement mesh for another purpose.
The program FEM_to_FD does that:
- In the middle of the ocean it simply splits squares in two.
- But it adds points near the coast so that no straits is closed and no isthmus opened.
A more manual (with pictures) is available here.
The archive (with Mfiles, manual and example) is available here.