1. Geotech Group, Galician Aerospace Innovation Centre (CINAE)University of VigoSchool of Mining and Energy EngineeringVigo36310Spain
2. Department of Cartographic and Land EngineeringUniversity of SalamancaPolytechnic School of AvilaHornos Caleros 5005003AvilaSpain
3. Department of Mining Technology, Topography and StructuresUniversity of LeonAvda. Astorga s/n24401PonferradaSpain
4. Department of Geoscience and Remote SensingDelft University of TechnologyStevinweg 1, 2628 CN DelftThe Netherlands