Using Vegetation Indices and a UAV Imaging Platform to Quantify the Density of Vegetation Ground Cover in Olive Groves (Olea Europaea L.) in Southern Spain. - Francisco J. Lima-Cueto; Rafael Blanco-Sepúlveda; María L. Gómez-Moreno; Federico B. Galacho-Jiménez (Remote. Sens., 2019)