**Author details**

Pablo Rodríguez‐Gonzálvez, Ángel Luis Muñoz‐Nieto, Sandra Zancajo‐Blázquez and Diego González‐Aguilera\*

\*Address all correspondence to: daguilera@usal.es

Department of Cartographic and Terrain Engineering, Higher Polytechnic School of Ávila, University of Salamanca, Ávila, Spain
