About: http://webisa.webdatacommons.org/23765630

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	User software to find all flat surfaces, e.g. floors, counter tops, then user pick the ones, which are actually floors and/or stairs.
http://www.w3.org/ns/prov#wasQuotedFrom	google.co.uk