IEEE Geoscience and Remote Sensing Magazine - June 2019 - 56

Table 2 shows the added value of using multiple parameters that describe the shape of absorption features. The
minerals alunite and dickite both have a deepest point of
absorption at 2.175 µm. Similarly, the deepest points of

absorption of kaolinite and halloysite overlap at 2.205 µm.
While the wavelength position alone would not help to
distinguish between these minerals, adding the asymmetry measure to the comparison does (it is negative for

TABLE 1. THE EFFECT OF CHANGING THE IDL DISPEC SETTINGS.
WAVELENGTH

DEPTH

WIDTH

AREA

ASYMMETRY

1

2.207

49.7

0.564

28.05

−0.14

2

1.396

43.1

0.557

24.02

−0.23

3

1.911

8.8

0.388

3.43

0.36

4

2.454

6.3

0.251

1.58

0.1

5

1.818

5.9

0.352

2.08

−0.25

Hull Quotient, Maximum Value

Normalized Reflectance

EXPERIMENT A

1.1
1
0.9
0.8
0.7
0.6
0.5

EXPERIMENT B

WAVELENGTH

DEPTH

WIDTH

AREA

ASYMMETRY

1

1.396

33.5

0.556

18.60

−0.23

2

2.208

23.4

0.550

12.87

−0.25

3

1.912

6.1

0.382

2.32

0.35

4

1.818

4.3

0.354

1.53

−0.26

5

2.447

1.7

0.246

0.41

0.37

Normalized Reflectance

0.5

1.1

1
1.5
2
Wavelength (µm)

2.5

Hull Difference, Maximum Value

1
0.9
0.8
0.7
0.6
0.5
0.5

WAVELENGTH

DEPTH

WIDTH

AREA

ASYMMETRY

1

2.208

31.7

0.146

4.60

−0.82

2

2.162

15.1

0.256

3.86

2.84

3

1.414

12.6

2.550

32.09

1.02

4

1.396

11.6

0.185

2.15

10.35

5

1.912

8.8

0.387

3.42

0.36

6

2.382

7.7

0.170

1.31

−1.72

7

2.315

6.8

0.238

1.61

0.06

8

1.360

3.6

1.407

5.13

−1.07

9

2.356

2.6

0.079

0.21

−0.04

10

2.115

1.3

0.163

0.2

−1.51

2.5

Hull Quotient, Inflection Point

Normalized Reflectance

EXPERIMENT C

1
1.5
2
Wavelength (µm)

1.1
1
0.9
0.8
0.7
0.6
0.5
0.5

1
1.5
2
Wavelength (µm)

2.5

Note: The kaolinite (CM9) spectrum of the USGS Spectral Library [27] is the one shown here. To obtain these results, the permitted feature depth is 1-100%, and the permitted wavelength range is 0.35-2.5 μm. A moving-average smoothing of three was applied, which is the default setting of the original DISPEC program [13].

TABLE 2. THE SHAPE PARAMETERS POSITION ( P), WIDTH (W), AND ASYMMETRY (A) OF THE DIAGNOSTIC SPECTRAL
ABSORPTION FEATURES OF ALUNITE, KAOLINITE, DICKITE, AND HALLOYSITE OF THE USGS SPECTRAL LIBRARY [27].
ALUNITE (AL706 NA)

DICKITE (NMNH106242)

KAOLINITE (CM9)

HALLOYSITE (CM13)

P

W

A

P

W

A

P

W

A

P

W

A

2.175

0.1431

−0.37

2.175

0.8800

0.48

2.195

0.1641

0.27

2.205

0.7055

−0.52

Note: These results were obtained using the default algorithm settings, a moving-average smoothing of 3, a permitted feature depth of 1-100%, and a full wavelength range.

56

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IEEE Geoscience and Remote Sensing Magazine - June 2019

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