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Table 2 Spatial relationship between each landslide factors and landslide using frequency ratio (FR), Certainty factor (CF) and information value (IV) methods

From: Landslide susceptibility mapping using statistical methods in Uatzau catchment area, northwestern Ethiopia

Factors Class Ncpix % Class Area (b) Nslpix % landslide in class (a) FR CP PP IV CF
Lithology Colluvial Deposit 39,011 25.2 524 32.9 1.3 0.01 0.01 0.27 0.24
Sandstone 51,186 33.1 320 20.1 0.6 0.01 0.01 −0.50 − 0.40
Weathered Basalt 64,419 41.7 748 47.0 1.1 0.01 0.01 0.12 0.11
Land use/cover Agriculture 83,991 54.3 375 8.4 1.1 0.004 0.004 0.1 0.07
Settlement 43,115 27.9 133 4.3 0.7 0.003 0.004 −0.3 −0.26
Grazing Land 25,490 16.5 76 2.6 0.7 0.003 0.004 −0.3 − 0.29
Bar Land 1364 0.9 61 0.1 10.7 0.045 0.004 2.4 0.91
Scatter Bush 616 0.4 0 0.1 0.0 0.000 0.004 0 −1.00
Distance to stream 0–50 47,432 30.7 2115 37.5 1.2 0.04 0.04 0.20 0.19
50–100 42,442 27.4 1487 26.4 1.0 0.04 0.04 −0.04 − 0.03
100–150 33,253 21.5 1416 25.1 1.2 0.04 0.04 0.16 0.15
150–200 22,225 14.4 469 8.3 0.6 0.02 0.04 − 0.55 −0.43
200–2, 355 9270 6.0 149 2.6 0.4 0.02 0.04 −0.82 − 0.57
Slope angle 0°–7° 48,562 31.4 1577 28.0 0.89 0.03 0.04 −0.12 −0.11
7°–14° 48,082 31.1 1329 23.6 0.76 0.03 0.04 −0.28 −0.25
14°–21° 29,704 19.2 1124 19.9 1.04 0.04 0.04 0.04 0.04
21°–28° 19,003 12.3 899 16.0 1.30 0.05 0.04 0.26 0.24
28°–68° 9271 6.0 707 12.5 2.09 0.08 0.04 0.74 0.54
Slope Aspect Flat (−1) 37,796 24.4 1143 20.3 0.83 0.03 0.04 −0.19 −0.18
North (0–22.5) 2094 1.4 23 0.4 0.30 0.01 0.04 −1.20 −0.71
NE (22.5–67.5) 17,652 11.4 388 6.9 0.60 0.02 0.04 −0.51 −0.41
E (67.5–112.5) 6855 4.4 146 2.6 0.58 0.02 0.04 −0.54 −0.42
SE(112.5–157.5) 6756 4.4 187 3.3 0.76 0.03 0.04 −0.28 −0.25
S (157.5–202.5) 26,889 17.4 1299 23.0 1.33 0.05 0.04 0.28 0.25
SW (202.5–247.5) 6981 4.5 428 7.6 1.68 0.06 0.04 0.52 0.42
W(247.5–292.5) 32,180 20.8 1656 29.4 1.41 0.05 0.04 0.34 0.30
NW (292.5–337.5) 9839 6.4 231 4.1 0.64 0.02 0.04 −0.44 −0.36
N (337.5–360) 7580 4.9 135 2.4 0.49 0.02 0.04 −0.72 −0.52
Slope Curvature Concave Slope (−26- -2) 22,881 14.8 1188 21.1 1.42 0.05 0.04 0.35 0.31
Flat Slope (−2–2) 109,717 71.0 3385 60.1 0.85 0.03 0.04 −0.17 −0.16
Convex Slope (Aleotti & Chowdhury, 1999; Zorgati et al., 2019; Bednarik et al., 2012; Bonham-Carter, 1994; Brabb, 1984; Chandak et al., 2016; Brunsden, 1979; Chen & Wang, 2007; Chung & Fabbri, 2005; Chung & Fabbri, 2003; Corominas et al., 2014; Cruden, 1991; Dai & Lee, 2002; Das & Lepcha, 2019; Donati & Turrini, 2002; Dou et al., 2014; Duman et al., 2006; Jazouli et al., 2019; Fell et al., 2008; Gorsevski et al., 2000; Gutiérrez et al., 2015; Hong et al., 2016) 22,024 14.2 1063 18.9 1.32 0.05 0.04 0.28 0.25
  1. IV is information value, FR is frequency ratio, CF is certainty factor, CA is a class area, LA is a landslide area in a class, CP is the conditional probability of landslide in a class, and PP is the prior probability of landslide in the entire area