1. Image Processing Laboratory (IPL), University of Valencia, 46980 Paterna, Spain
2. Group of Research for Watershed Sustainability (GISOCH), Faculty of Sciences, Escuela Superior Politécnica de Chimborazo (ESPOCH), Riobamba 060155, Ecuador
3. Unit for Sustainable Environmental and Forest Management, Department of Soil Science and Agricultural Chemistry, University of Santiago de Compostela, E-27002 Lugo, Spain
4. Research Group in the Natural Resources Field (GIARN), Faculty of Natural Resources, Escuela Superior Politécnica de Chimborazo (ESPOCH), Riobamba 060155, Ecuador