About: http://webisa.webdatacommons.org/405868142

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 compass signal output is compared to the signal output of a relative heading sensor such as a gyroscope to identify changes in the compass output caused by these landmarks rather than actual changes in heading.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com