1. Geodesy and Geomatics Division—DICEA, Sapienza University of Rome, via Eudossiana, 00184 Rome, Italy
2. Sapienza School for Advanced Studies, Sapienza University of Rome, viale Regina Elena, 00161 Rome, Italy
3. ISPRA—Italian Institute for Environmental Protection and Research, via Vitaliano Brancati, 00144 Rome, Italy