overlaps two-dimensional continuant fiat boundary ice surface layer two-dimensional fiat ice surface 2019-01-31T20:25:26Z An two-dimensional continuant fiat boundary which overlaps the surface layer of a mass of ice. This class was created during a semantic harmonisation exercise with the SWEET resource, currently adminstered by Earth Science Information Partners. Its subclass(es) are mapped to the corresponding SWEET terms, which were determined to align with fiat boundaries rather than physical ones.