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Table 3 Computation of LNRF model on landslide determining Factors

From: Landslide susceptibility mapping using knowledge driven statistical models in Darjeeling District, West Bengal, India

Parameters Area Landslides Area LNRF Fuzzy membership values using LNRF model
In Hectare In Percentage In Hectare In Percentage
Rainfall (mm)
 Very Low (1877.38–1991.97) 27659.36 8.78 0 0 0 0
 Low (1991.97–2090.54) 24856.96 7.89 0 0 0 0
 Moderate (2090.45–2167.44) 80967.44 25.71 31.56 7.32 0.37 0.11
 High (2167.44–2239.06) 114335.78 36.31 294.58 68.29 3.41 1.00
 Very High (2239.06–2333.96) 67080.46 21.3 105.21 24.39 1.22 0.36
Slope (Degree)
 Very Low (0–9.32) 101505.25 32.23 14.5 3.36 0.17 0.11
 Low (9.32–18.64) 58545.55 18.59 52.56 12.18 0.61 0.39
 Medium (18.44–27.34) 70795.02 22.48 103.31 23.95 1.2 0.76
 High (27.34–36.66) 57571.95 18.28 135.93 31.51 1.58 1.00
 Very High (36.66–79.23) 26482.23 8.41 125.06 28.99 1.45 0.92
Altitude (m)
 Very Low (15–422.93) 115880.61 36.8 35.17 8.15 0.41 0.16
 Low (422.93–985.6) 71784.89 22.8 224.01 51.93 2.6 1.00
 Medium (985.6–1576.4) 63320.09 20.11 81.46 18.88 0.94 0.36
 High (1576.4–2279.73) 44471.47 14.12 72.2 16.74 0.84 0.32
 Very High(2279.73–3602) 19442.94 6.17 18.51 4.29 0.21 0.08
Aspect
 Flat (−1) 163.37 0.05 0 0 0 0
 North (0–22.5) 20317.92 6.45 7.41 1.72 0.09 0.07
 North-East (22.5–67.5) 39614.59 12.58 25.92 6.01 0.3 0.22
 East (67.5–112.5) 39009.88 12.39 59.24 13.73 0.69 0.51
 South-East (112.5–157.5) 44774.25 14.22 87.01 20.17 1.01 0.75
 South (157.5–202.5) 45083.47 14.32 116.63 27.04 1.35 1.00
 South-West (202.5–247.5) 39204.16 12.45 70.35 16.31 0.82 0.61
West (247.5–292.5) 32441.32 10.3 49.98 11.59 0.58 0.43
 North-West (292.5–337.5) 35974.84 11.42 12.96 3 0.15 0.11
 North (337.5–360) 18316.21 5.82 1.85 0.43 0.02 0.01
Geology
 Triassic 166113.98 52.75 302.86 70.21 3.51 1
 Cenozoic 23200.35 7.37 82.6 19.15 0.96 0.27
 Pliocene-Pleistocene 11258.98 3.58 45.89 10.64 0.53 0.15
 Holocene 58152.53 18.47 0 0 0 0
 Middle-upper Pleistocene 56174.15 17.84 0 0 0 0
Soil texture
 Gravelly loamy 23549.04 7.48 68.11 15.79 0.79 0.46
 Fine loamy Coarse Loamy 126713.02 40.24 113.51 26.32 1.32 0.77
 Gravelly loamy, Loamy Skeletal 38586.66 12.25 147.57 34.21 1.71 1
 Gravelly Loamy Coarse Loamy 120449.25 38.25 90.81 21.05 1.05 0.61
 Coarse Loamy 5602.03 1.78 11.35 2.63 0.13 0.08
Distance from River (km)
 0–0.42 km 99542.45 31.61 73.65 17.07 0.85 0.37
 0.42–1.10 km 110752.04 35.17 199.89 46.34 2.32 1
 1.10–1.66 km 64340.57 20.43 115.73 26.83 1.34 0.58
 1.66–2.26 km 32920.37 10.45 42.08 9.76 0.49 0.21
 2.26–4.33 km 7344.58 2.33 0 0 0 0
Distance from Lineament (km)
 0–1.54 km 81563.6 25.9 110.6 25.64 1.28 0.77
 1.54–2.85 km 95262.67 30.25 44.24 10.26 0.51 0.31
 2.85–4.20 km 77028.98 24.46 143.78 33.33 1.67 1.00
 4.20–5.75 km 44870.1 14.25 99.54 23.08 1.15 0.69
 5.75–10.12 km 16174.66 5.14 33.18 7.69 0.38 0.23
Distance from Road (km)
 0–1.74 km 140275.58 44.55 88.48 20.51 1.03 0.67
 1.74–3.94 km 84741.4 26.91 44.24 10.26 0.51 0.33
 3.94–6.72 km 50166.43 15.93 66.36 15.38 0.77 0.50
 6.72–10.22 km 27267.21 8.66 132.72 30.77 1.54 1.00
 10.22–16.49 12449.37 3.95 99.54 23.08 1.15 0.75
Land use/Land cover
 Water bodies 3466.31 1.1 39.87 9.24 0.46 0.16
 Vegetation 227240.32 72.16 255.55 59.24 2.96 1.00
 Fallow land 14437.29 4.58 29 6.72 0.34 0.11
 Agricultural Land 65442.75 20.78 106.93 24.79 1.24 0.42
 Settlement 4313.33 1.37 0 0 0 0.00
NDVI
 Very Low (−0.07–0.12) 37936.34 12.05 114.18 26.47 1.32 0.91
 Low (0.12–0.17) 83384.9 26.48 125.06 28.99 1.45 1.00
 Medium (0.17–0.23) 85506.39 27.15 96.06 22.27 1.11 0.77
 High (0.23–0.29) 70015.86 22.23 65.25 15.13 0.76 0.52
 Very High (0.29–0.49) 38056.51 12.09 30.81 7.14 0.36 0.25
TWI
 Very Low (1.95–7.37) 49986.44 15.87 63.12 14.63 0.73 0.35
 Low (7.37–8.53) 113766.56 36.13 178.85 41.46 2.07 1.00
 Medium (8.53–9.76) 93346.92 29.64 115.73 26.83 1.34 0.65
 High (9.76–11.70) 46923.5 14.9 73.65 17.07 0.85 0.41
 Very High (11.70–18.91) 10876.58 3.45 0 0 0 0