Use of Imaging Spectroscopy for Mapping and Quantifying the Weathering Degree of Tropical Soils in Central Brazil

Table 1

RCGb obtained by means of TGA and AVIRIS data for samples collected in São João D’Aliança (SJA) and in Niquelândia (NIQ).

Soil samples	Minerals (%)		RCGb
	Gibbsite	Kaolinite	TGA	AVIRIS
SJA 1	11.68	32.81	0.74	0.73
SJA 2	13.84	34.53	0.71	0.76
SJA 3	14.10	52.95	0.79	0.76
SJA 4	11.71	57.99	0.83	0.76
SJA 5	13.18	60.79	0.82	0.76
SJA 6	14.16	60.14	0.81	0.75
SJA 7	14.22	55.61	0.80	0.73
SJA 8	16.30	54.75	0.77	0.72
SJA 9	18.64	55.47	0.75	0.70
SJA 10	19.02	53.17	0.74	0.69
SJA 11	22.86	52.59	0.70	0.66
SJA 12	23.27	54.53	0.70	0.64
SJA 13	25.66	55.04	0.68	0.64
NIQ 1	30.66	19.71	0.39	0.52
NIQ 2	26.38	35.13	0.57	0.56
NIQ 3	23.08	39.69	0.63	0.58
NIQ 4	26.35	33.70	0.56	0.58
NIQ 5	27.09	54.85	0.67	0.60
NIQ 6	27.17	53.56	0.66	0.61
NIQ 7	24.98	47.61	0.66	0.62
NIQ 8	13.84	52.87	0.79	0.65
NIQ 9	20.71	52.28	0.72	0.68
NIQ 10	20.73	52.34	0.72	0.68
NIQ 11	21.34	47.67	0.69	0.69
NIQ 12	16.16	61.72	0.79	0.69
NIQ 13	19.06	50.27	0.73	0.70
NIQ 14	14.55	56.65	0.80	0.81
NIQ 15	7.61	57.25	0.88	0.81
NIQ 16	6.51	58.81	0.90	0.82
NIQ 17	11.49	60.97	0.84	0.68