1. Faculty of Environmental Engineering, Geomatics and Renewable Energy, Kielce University of Technology, Aleja Tysiąclecia Państwa Polskiego 7, 25-314 Kielce, Poland
2. Faculty of Management and Computer Modelling, Kielce University of Technology, Aleja Tysiąclecia Państwa Polskiego 7, 25-314 Kielce, Poland