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Table 2 Percentage of optimal wavelength combinations constructed from the three-wavelength normalized difference index (TNDI) in response to different deterioration patterns

From: Hyperspectral estimation method for deterioration of rock carvings in the humid regions of southern China

Types

Original state

Surface integrity damage

Surface morphological change

Surface color change

Biological colonization

Figure 10a

0

27.91

45.97

9.28

16.84

Figure 10b

27.87

36.88

16.28

18.96

0.01

Figure 10c

37.14

27.05

24.96

10.85

0

Figure 10d

12.83

26.41

19.15

0.05

41.56