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Table 4 Importance ranking of polygon area index features extracted by three algorithms in tree species classification based on feature sets and the results from WorldView-3

From: Effectiveness of the spectral area index created by three algorithms for tree species recognition

Importance ranking

Feature set 1

Feature set 2

Feature set 3

Importance value

Characteristic

Importance value

Characteristic

Importance value

Characteristic

1

2.58

Band 3

2.36

Band 2

2.30

PAI3 2 to 4

2

2.27

PAI1 1 to 2

2.34

Band 2 MEA

2.05

PAI3 2 to 3

3

2.23

Band 3 MEA

2.24

Band 3 MEA

1.93

PAI3 7 to 8

4

2.12

Band 2

2.16

PAI2 1 to 2

1.87

Band 1 MEA

5

2.11

Band 2 MEA

2.12

Band 5

1.82

PAI3 6 to 7

6

2.09

Band 5

2.07

Band 3

1.71

Band 2 MEA

7

1.94

Band 1

2.07

Band 1 MEA

1.61

Band 1

8

1.93

Band 1 MEA

1.89

Band 1

1.57

PAI3 6 to 8

9

1.83

Band 6

1.86

Band 5 MEA

1.56

PAI3 5 to 6

10

1.80

Band 5 MEA

1.85

Band 6 MEA

1.52

Band 2

11

1.53

PAI1 1 to 3

1.82

Band 6

1.45

PAI3 1 to 5

12

1.52

PAI1 3 to 4

1.47

PAI2 2 to 3

1.45

Band 3 MEA

13

1.52

PAI1 2 to 3

1.45

PAI2 5 to 6

1.44

PAI3 2 to 5

14

1.48

PAI1 5 to 6

1.43

PAI2 3 to 4

1.42

Band 6 MEA

15

1.44

Band 6 MEA

1.43

PAI2 1 to 3

1.41

Band 6

16

1.35

PAI1 4 to 5

1.41

PAI2 4 to 5

1.37

PAI3 3 to 4

17

1.32

Band 4 MEA

1.35

Band 4 MEA

1.32

PAI3 1 to 3

18

1.27

Band 7

1.34

PAI2 4 to 6

1.31

PAI3 2 to 6

19

1.25

PAI1 4 to 6

1.25

Band 7

1.29

PAI3 3 to 5

20

1.23

Band 7 MEA

1.24

PAI2 1 to 4

1.26

Band 5 MEA

21

1.22

PAI1 2 to 4

1.22

PAI2 3 to 6

1.24

PAI3 4 to 6

22

1.21

Band 8

1.22

Band 7 MEA

1.21

PAI3 4 to 5

23

1.20

Band 4

1.19

PAI2 2 to 4

1.21

PAI3 3 to 6

24

1.18

PAI1 3 to 5

1.15

Band 4

1.21

PAI3 1 to 4

25

1.12

PAI1 3 to 6

1.15

Band 8

1.11

Band 7 MEA

26

1.11

PAI1 1 to 4

1.11

PAI2 3 to 5

1.08

Band 5

27

1.10

Band 8 MEA

1.09

Band 8 MEA

1.07

PAI3 1 to 6

28

1.08

PAI1 7 to 8

1.05

PAI2 6 to 7

1.06

Band 3

29

0.92

PAI1 2 to 5

1.04

PAI2 2 to 5

1.06

PAI3 1 to 2

30

0.88

PAI1 1 to 5

0.97

PAI2 7 to 8

1.04

Band 7

31

0.86

PAI1 6 to 8

0.92

PAI2 5 to 7

1.0

Band 8

32

0.86

PAI1 6 to 7

0.92

PAI2 2 to 6

1.0

PAI3 1 to 7

33

0.86

PAI1 5 to 7

0.90

PAI2 1 to 7

0.99

Band 4 MEA

34

0.85

PAI1 2 to 7

0.89

PAI2 5 to 8

0.96

PAI3 3 to 7

35

0.84

PAI1 5 to 8

0.85

PAI2 4 to 7

0.95

PAI3 4 to 7

36

0.79

PAI1 4 to 7

0.80

PAI2 1 to 6

0.95

PAI3 2 to 7

37

0.78

PAI1 2 to 6

0.79

PAI2 2 to 8

0.9

PAI3 5 to 7

38

0.78

PAI1 1 to 7

0.76

PAI2 6 to 8

0.85

Band 8 MEA

39

0.71

PAI1 1 to 8

0.74

PAI2 1 to 5

0.84

PAI3 5 to 8

40

0.69

PAI1 4 to 8

0.73

PAI2 4 to 8

0.81

PAI3 2 to 8

41

0.69

PAI1 1 to 6

0.69

PAI2 3 to 7

0.80

PAI3 4 to 8

42

0.68

PAI1 3 to 7

0.65

PAI2 2 to 7

0.80

PAI3 3 to 8

43

0.62

PAI1 3 to 8

0.65

PAI2 1 to 8

0.75

Band 4

44

0.55

PAI1 2 to 8

0.63

PAI2 3 to 8

0.67

PAI3 1 to 8