<http://webisa.webdatacommons.org/327883417>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/prov/162851624>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/327883417> .
<http://webisa.webdatacommons.org/327883417>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<utexas.edu> .
<http://webisa.webdatacommons.org/327883417>	<http://www.w3.org/ns/prov#value>	"are also gaps caused by factors such as cloud cover or lack of ground control." .