1. Forest Research Institute, Hellenic Agricultural Organization “DIMITRA”, Vassilika, 57006 Thessaloniki, Greece
2. Institute of Mediterranean Forest Ecosystems, Hellenic Agricultural Organization “DIMITRA”, Terma Alkmanos, 11528 Athens, Greece
3. Laboratory of Photogrammetry and Remote Sensing (PERS Lab), School of Rural and Surveying Engineering, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece