1. Center of Geographical Studies, Institute of Geography and Spatial Planning, University of Lisbon, R. Branca Edmée Marques, 1600-276 Lisbon, Portugal
2. Institute of Geography and Spatial Planning, University of Lisbon, R. Branca Edmée Marques, 1600-276 Lisbon, Portugal
3. Associated Laboratory TERRA, Instituto Superior de Agronomia, Universidade de Lisboa, 1349-017 Lisboa, Portugal