I want to ask a question about SWAN model if applied in polar (arctic or antarctic) area. The angles calculated from the coordinates in the grid file may not satisfy the prerequisite, as it says in SWAN manual "SWAN will check whether all angles in the grid are >0 and <180 degrees". Is there any good method to overcome this problem? Or, in this weird case, the grid should only be created as regular Cartesian grid in meters?
Thanks a lot!
Wu