UAVs Challenge to Assess Water Stress for Sustainable Agriculture Publication Type: Journal Article Authors: Jorge Gago; Jaume Flexas; Cyril Douthe; Rafael E. Coopman; Pedro Pablo Gallego; Miquel Ribas Carbo; José Mariano Escalona; José Mariano Escalona Source: Agricultural Water Management, Volume 153 , p.9–19 (2015)