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 |