Department of Remote Sensing Science and Technology School of Electronic Engineering Xidian University 710077 Xi’an China;
State Key Laboratory of Information Engineering in Surveying Mapping and Remote Sensing Wuhan University 430079 Wuhan ChinaDepartment of Remote Sensing and Photogrammetry Finnish Geospatial Research Institute 02430 Masala Finland;
Plant Systematics and Ecology Laboratory Higher Teacher’s Training College University of Yaounde I BP 337 Yaounde Cameroon;
AMAP Univ Montpellier IRD CNRS CIRAD INRAE F-34000 Montpellier France;