Institution: | 1. Department of Geography , Norwegian University of Science and Technology (NTNU) , NO-7491 , Trondheim , Norway jan.rod@svt.ntnu.no;3. Sogn og Fjordane University College , P.O. Box 133, NO-6851 , Sogndal , Norway;4. Department of Geography , Norwegian University of Science and Technology (NTNU) , NO-7491 , Trondheim , Norway |