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\section{Introduction}  In the last decades, advances in remote sensing image acquisition systems have moved in lockstep with the need for applications that make use of such sort of data. Land-use classification~\cite{Pisani_2014,Bagan_2010,Capucim_2015}, target recognition~\cite{Dong_2015,Martorella_2011,Du_2011} and band selection in hyper-spectral images~\cite{He_Yang_2011,Yuan_Yuan_2015} are among the most pursued applications, just to name a few.  %using nature-inspired techniques~\cite{Nakamura_2014}