About: http://webisa.webdatacommons.org/283874000

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	The best one can do is to pick a spot and calculate the mean sea level at that point and use it as a datum.
http://www.w3.org/ns/prov#wasQuotedFrom	goo.ne.jp