Funding for this research was provided by:
Chongqing Graduate Student Innovation Project (CYB14103)
Chongqing Research Program of Basic Research and Frontier Technology (cstc2014jcyjA30015, cstc2015 jcyjBX0073, No.cstc2014jcyjA30014)
Science and Technology Project of Land Resources and Real Estate Management Bureau of Chongqing Government (CQGT-KJ-2014052)