1. Dpto. de Ingeniería Cartográfica, Geodésica y Fotogrametría. Escuela Politécnica Superior de Jaén, University of Jaén, Jaén, Spain
2. Department of Regional Policy and European Integration, Faculty of Geographical and Geological Sciences, Institute of Socio-Economic Geography and Spatial Management of Adam Mickiewicz University of Poznań, Poznań, Poland