1. College of Geography and Environmental Science, Henan University, Kaifeng, China
2. School of Biological Sciences, Center for Earth Observation and Modeling, University of Oklahoma, Norman, OK, USA
3. College of Geography and Environmental Science, the Key Laboratory of Geospatial Technology for the Middle and Lower Yellow River Regions (Henan University), Ministry of Education, Xinyang Academy of Ecological Research, Henan Dabieshan National Field Observation and Research Station of Forest Ecosystem, Henan University, Kaifeng, China