1. School of Electrical and Computer Engineering, National Technical University of Athens, Zografou Campus, 15780 Athens, Greece
2. Division of Green Areas and Urban Fauna, City of Athens, P. Kanellopoulou 5, 11525 Athens, Greece
3. School of Chemical Engineering, National Technical University of Athens, Zografou Campus, 15773 Athens, Greece
4. Department of Geography, Sultan Qaboos University, Al-Khoud 123, Oman