About: http://webisa.webdatacommons.org/408606843

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	But they face strict limits that keep them at low altitude, within the operator???s sight and away from urban areas and other aircraft.
http://www.w3.org/ns/prov#wasQuotedFrom	illinois.edu