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Table 2 Quantitative values of the terrain groups, calculated globally

From: Global terrain classification using 280 m DEMs: segmentation, clustering, and reclassification

Terrain group

Cluster reference numbers (see Additional file 1 for Japanese conditions)

Average of slope gradient

Average of surface texture

Average of local convexity

Threshold of combined texture

Average of combined texture

Degrees

Z scorea

%

Z score

%

Z score

1a

6, 15, 22, 40

14.8

2.25

70

0.77

43

0.85

> 0.41

0.72

1b

14.9

2.25

63

0.42

42

0.75

 0.41

0.15

2a

5, 17, 19, 29

7.8

1.54

73

0.94

41

0.62

> 0.15

0.69

2b

6.5

1.34

68

0.65

38

0.43

 0.15

− 0.20

3a

4, 7, 10, 14, 20, 24, 25, 31, 39

2.8

0.50

71

0.79

40

0.55

> 0.1

0.51

3b

1.7

0.10

71

0.83

39

0.46

 0.1

−  0.43

4

18

7.5

1.49

55

− 0.03

45

0.94

 

− 0.08

5

16, 34

2.7

0.49

57

0.06

44

0.85

 

− 0.03

6

2, 21, 28, 37, 38

0.8

− 0.38

67

0.63

40

0.55

 

− 0.06

7

9

1.3

− 0.10

61

0.28

37

0.29

 

0.10

8

3, 26, 30

0.4

− 0.72

55

− 0.05

34

0.08

 

− 0.46

9

1, 11, 12, 13, 36

0.9

− 0.35

47

− 0.46

35

0.18

 

− 0.58

10

35

0.3

− 0.82

42

− 0.72

25

− 0.62

 

− 0.91

11

27, 32, 33

0.2

− 0.93

30

− 1.37

16

− 1.38

 

− 1.45

12

8, 23

0.1

− 1.04

14

− 2.20

3

− 2.45

 

− 2.20

  1. a1 Normalized value using global average and standard deviation