“…UAVs are highly suitable when aerial operations are required, and the presence of a pilot is dangerous, impossible, or simply expensive (Sinopoli, Micheli, Donato, & Koo, 2001). This pertains to a wide range of applications, including search and rescue (Varela et al, 2014), aerial mapping (Mesas-Carrascosa, Notario-García, de Larriva, de la Orden, & Porras, 2014), target tracking (Quintero & Hespanha, 2014), flight formation autonomously (Tuna, Nefzi, & Conte, 2014), avoid obstacle automatically (Moon & Prasad, 2011) and disaster recovery (Tuna et al, 2014).…”