Reconstruction of extreme topography from UAV structure from motion photogrammetry - Agueera-Vega, Francisco; Carvajal-Ramirez, Fernando; Martinez-Carricondo, Patricio; Sanchez-Hermosilla Lopez, Julian; Javier Mesas-Carrascosa, Francisco; Garcia-Ferrer, Alfonso; Juan Perez-Porras, Fernando (MEASUREMENT, 2018)