About: http://webisa.webdatacommons.org/370299697

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	However, sea and swell waves may occasionally be seen coming from essentially the same direction, thus making it more difficult to distinguish the two systems, especially if the sea waves are high.
http://www.w3.org/ns/prov#wasQuotedFrom	weatheronline.gr