Funding for this research was provided by:
the NSF of China (61305087)
the NSF of China (61673354)
the NSF of China (61672474)
the NSF of China (61501412)
Open Research Project of The Hubei Key Laboratory of Intelligent Geo-Information Processing (KLIGIP201603)
Open Research Project of The Hubei Key Laboratory of Intelligent Geo-Information Processing (KLIGIP201607)
US National Science Foundation Award (1626586)
Article History
Received: 17 December 2016
Revised: 10 February 2017
Accepted: 25 March 2017
First Online: 1 April 2017