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This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).
Three instances of “elbow” curves produced during HAC process using real hyperspectral data. Corresponding critical points c* in: “o” = (272, 2883) produced 16 clusters, “+” = (300, 2970) produced 14 clusters and “×” = (306, 2079) produced 14 clusters.