Funding for this research was provided by:
the Program for New Century Excellent Talents in University (NCET-12-0953)
the excellent youth team of scientific and technological innovation of Hubei higher education (T201736)
the Open Research Project of Hubei Key Laboratory of Intelligent Geo-Information Processing (KLIGIP201601)
Article History
Received: 26 September 2017
Accepted: 21 February 2018
First Online: 28 February 2018
Compliance with ethical standards
:
: The authors declare no conflict of interest.