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Table 2 Representative combinations of factors from each group giving the best landslide susceptibility maps using frequency ratio method

From: Effect of Landslide Factor Combinations on the Prediction Accuracy of Landslide Susceptibility Maps in the Blue Nile Gorge of Central Ethiopia

No. Selected frequency ration maps Prediction accuracy (%) # of landslide factors used # of possible combinations Min LSI (b) Max LSI (a) Difference (a-b)
1 sl+as+pr+pl+li+lu+dl+dr 87.6 8 1 2.54 38.95 36.41
2 sl+as+pr+pl+li+dl+dr 86.2 7 8 2.46 29.73 27.27
3 sl+as+pr+pl+li+lu+dl 87.7* 1.58 36.59 35.01
4 sl+pr+pl+li+lu+dl+dr 87.6 2.37 37.74 35.37
5 sl+as+pr+pl+li+lu+dr   2.36 36.03 33.67
6 sl+as+pr+pl+lu+dl+dr   2.41 36.66 34.25
7 sl+as+pl+li+lu+dl+dr 87.7* 2.04 32.80 30.76
8 sl+as+pr+li+lu+dl+dr 87.7* 1.92 32.76 30.84
9 sl+as+pr+pl+li+lu 86.9 6 28 1.4 33.67 32.27
10 sl+pr+pl+li+dl+dr 86.1 2.29 28.70 26.41
11 sl+as+pr+pl+li+dr 84.9 2.36 26.81 24.45
12 sl+as+pr+li+dl+dr 86.3 1.79 23.90 22.11
13 sl+as+li+lu+dl+dr 87.6 14.42 26.61 25.19
14 sl+pr+pl+li+lu 86.8 5 56 1.29 32.20 30.91
15 sl+as+li+lu+dr 87.0 1.24 23.69 22.45
16 sl+as+li+dl+dr 86.2 1.28 17.79 16.51
17 li+sl+dl+dr 86.1 4 70 1.17 16.34 15.17
18 li+sl+lu+dr 86.8 1.07 22.46 21.39
19 li+sl+pr+lu 87.0 0.67 26.03 25.36
20 sl+as+pl+lu 86.4 0.77 25.21 24.44
21 sl+li+lu+dl 87.7* 0.27 22.78 22.51
22 sl+pl+li+lu 86.9 0.79 26.05 25.56
23 sl+as+li 85.3 3 56 0.28 12.09 11.81
24 sl+dl+li 86.3 0.27 13.57 13.30
25 sl+as+dr 84.7 1.07 13.42 12.35
26 Sl+li+lu 86.9 0.17 19.86 19.69
27 li+sl 85.0 2 28 0.17 10.64 10.47
28 sl+dr 84.3 0.04 11.13 11.09
  1. Note: sl=slope, as=aspect, pr=profile curvature, pl=plan curvature, li=lithology, lu=land use, dl=distance from lineament, dr=distance from river, LSI=Landslide Susceptibility Index, *=Highest prediction accuracy. a = Max LSI = maximum landslide susceptibility index, b = Min LSI = minimum landslide susceptibility index.