About: http://webisa.webdatacommons.org/430339616

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	Wi-Fi is emerging as a back-up technology for GPS systems, whose signals are often blocked by tall buildings and other structures in urban areas.
http://www.w3.org/ns/prov#wasQuotedFrom	acm.org