1. Department of Natural Resources and Environmental Engineering, CINTECX, Universidade de Vigo, GeoTECH Group, Campus Universitario de Vigo, Vigo, Spain
2. Department of Cartographic and Land Engineering, Tidop Research Group, Eps Ávila, University of Salamanca, Ávila, Spain
3. Computer Vision and Systems Laboratory, Department of Electrical and Computer Engineering, Université Laval, Québec, QC, Canada