About: http://webisa.webdatacommons.org/135812031

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	While it is possible to use vector function of the differences, such as the gradient, using such functions give generally unreliable results.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com