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The first step of this study consisted of a visual analysis of Landsat images including contrast and colour analyses. This analysis helped us to Iocate four subimages (256 x 256 pixels). The processing of Landsat digital data consisted of several parts: (a) selection of the optimal channels for a multispectral classification of Landsat digital data: (b) determination of the thresholds, by different methods (frequency histograms, radiometric transects and radiometric-charactenzation of thedoi:10.1080/01431169108929709 fatcat:g25b3h2p3betjerkjsdlztnoji