Table 2.

Entropy correlation between field data and proposed method.

Spectral Data	Euclidean		SAD
	HAC	HAC&SU	HAC	HAC&SU
Group 1	−0.19	0.85	−0.12	0.51
Group 2	0.59	0.78	0.65	0.87
Group 3	0.50	0.82	−0.06	0.87
Group 4	−0.56	0.30	−0.28	0.41