1. a Geological Research Institute , Blloku ‘Vasil Shanto’ , Tirana, Albania
2. b International Institute for Geoinformation Science and Earth Observation , ITC , Hengelosestraat 99, PO Box 6, 7500 AA Enschede, The Netherlands
3. c University Utrecht , Faculty of Geosciences , Department of Physical Geography , PO Box 80115, 3508 TC Utrecht, The Netherlands