thank you for sharing.
Regarding this point:
This happens at my computer as well - should not cause an error.
But I receive the same message in SNAP
However, when I apply a small buffer to the polygon, everything works. There might be some sliver geometries or invalid definitions which are causing the problem.
I ran “fix geometries” by QGIS on the file and it works as well, please try: LakeWinnipeg_WGS84.zip (697.7 KB)
