About: http://webisa.webdatacommons.org/405482801

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	This phenomenon occurs as a result of a shadowing effect produced by buildings and natural obstacles such as hills located between the transmitting and receiving antennas of the mobile station and the base station.
http://www.w3.org/ns/prov#wasQuotedFrom	google.fr