1. Lecturer at the Cartographic Engineering, Geodesy and Photogrammetry Dept., Polytechnic Univ. of Valencia, Camino de Vera, s/n, 46022 Valencia, Spain (corresponding author).
2. Lecturer at the Cartographic Engineering, Geodesy and Photogrammetry Dept., Polytechnic Univ. of Valencia, Camino de Vera, s/n, 46022 Valencia, Spain.