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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