1. Professor, Dept. of Cartographic Engineering, Geodesy and Photogrammetry, Polytechnic Univ. of Madrid, Madrid 28040, Spain.
2. Senior Lecturer, Dept. of Cartographic Engineering, Geodesy and Photogrammetry, Polytechnic Univ. of Madrid, Madrid 28040, Spain.
3. Professor, Dept. of Engineering, Univ. of Almería, Almería 04120, Spain (corresponding author). ORCID: .