1. A method for preparing a reference template for classification of remote scenes comprising the steps of: (a) classifying a set of reference scenes via a conventional classification technique for obtaining a set of preclassified scenes; (b) using a spectral imager for measuring a spectral cube of said preclassified referenced scenes; (c) employing a decorrelation statistical method for extracting said spectral cube for decorrelated spectral data characterizing said reference scenes; and (d) using at least a part of said decorrelated spectral data for the preparation of the reference template for remote scenes classification.