Diachronic reconstruction of lost cultural heritage sites. Study case of the medieval wall of avila (Spain) - Rodríguez-Gonzálvez P; Cardozo Mamani S; Guerra Campo A; Sánchez-Aparicio L; Del Pozo S; Muñoz-Nieto A; González-Aguilera D (International Archives Of The Photogrammetry, Remote Sensing And Spatial Information Sciences - Isprs Archives, 2018)