Ice of Land Origin Ontology GeoLink Base Ontology Source
http://purl.org/wmo/seaice/iceOfLandOrigin#IceShelf http://vocab.nerc.ac.uk/collection/L06/current/92/ LOOM
http://purl.org/wmo/seaice/iceOfLandOrigin#IceIsland http://vocab.nerc.ac.uk/collection/L06/current/91/ LOOM