1Department of Hydraulic Engineering, Faculty of Reclamation and Environmental Engineering,
Poznań University of Life Sciences, Piątkowska 94, 60-649 Poznań, Poland
2Institute of Geodesy and Geoinformatics, Wrocław University of Environmental and Life Sciences, Poland
3Department of Forest Management, Faculty of Forestry, Poznań University of Life Sciences, Poland
Pol. J. Environ. Stud. 2012;21(1):115–122