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Table 2 Data analyses and results obtained from Weights of Evidence model

From: GIS-based landslide susceptibility mapping and assessment using bivariate statistical methods in Simada area, northwestern Ethiopia

Factor

Class

Npix1

Nslide

Nclass

Npix2

Npix3

Npix4

W+

W-

C

Slope(degree)

0–5

97

5126

15,104

5029

15,007

186,378

−1.37

0.06

−1.43

5–12

1362

5126

71,393

3764

70,031

131,354

−0.27

0.12

−0.39

12–30

2914

5126

110,037

2212

107,123

94,262

0.07

− 0.08

0.15

30–45

703

5126

9661

4423

8958

192,427

1.13

−0.10

1.23

> 45

50

5126

316

5076

266

201,119

2.00

−0.01

2.01

Curvature

Concave

3300

5126

104,276

1826

100,976

100,409

0.25

−0.34

0.59

Flat

45

5126

1944

5081

1899

199,486

−0.07

0.00

− 0.07

Convex

1781

5126

100,291

3345

98,510

102,875

−0.34

0.24

−0.59

Aspect

N

261

5126

9699

4865

9438

191,947

0.08

0.00

0.09

NE

1466

5126

37,106

3660

35,640

165,745

0.48

−0.14

0.62

E

1226

5126

41,856

3900

40,630

160,755

0.17

−0.05

0.22

SE

636

5126

31,166

4490

30,530

170,855

−0.20

0.03

−0.23

S

591

5126

26,762

4535

26,171

175,214

−0.12

0.02

−0.14

SW

522

5126

28,551

4604

28,029

173,356

−0.31

0.04

−0.35

W

262

5126

18,760

4864

18,498

182,887

−0.59

0.04

−0.63

NW

68

5126

7457

5058

7389

193,996

−1.02

0.02

−1.04

N

94

5126

5154

5032

5060

196,325

−0.31

0.01

−0.32

Rainfall(mm/yr)

627–727

811

5126

39,813

4315

39,002

162,400

−0.20

0.04

−0.25

727–813

754

5126

53,885

4372

53,131

148,271

−0.58

0.15

−0.73

813–901

1802

5126

51,601

3324

49,799

151,603

0.35

−0.15

0.50

901–994

1253

5126

34,881

3873

33,628

167,774

0.38

−0.10

0.48

994–1125.2

506

5126

26,348

4620

25,842

175,560

−0.26

0.03

−0.30

Distance to stream (m)

0–50

1028

5126

24,940

4098

23,912

177,490

0.52

−0.10

0.62

50–100

940

5126

22,768

4186

21,828

179,574

0.53

−0.09

0.61

100–150

632

5126

23,290

4494

22,658

178,744

0.09

−0.01

0.10

150–200

349

5126

16,063

4777

15,714

185,688

−0.14

0.01

−0.15

> 200

2177

5126

119,467

2949

117,290

84,112

−0.32

0.32

−0.64

Land use

Agricultural Land

3091

5126

143,001

2035

139,910

61,492

−0.14

0.26

−0.40

Moderate Forest

22

5126

4844

5104

4822

196,580

−1.72

0.02

−1.74

River

77

5126

2048

5049

1971

199,431

0.43

−0.01

0.43

Graze Land

1477

5126

29,754

3649

28,277

173,125

0.72

−0.19

0.91

Sparse Forest

121

5126

3481

5005

3360

198,042

0.35

−0.01

0.35

Settlement

54

5126

14,047

5072

13,993

187,409

−1.89

0.06

−1.95

Bush

284

5126

9353

4842

9069

192,333

0.21

−0.01

0.22

Lithology

Residual Soils

61

5126

26,102

5065

26,041

175,352

−2.39

0.13

−2.51

Trachyte

149

5126

10,983

4977

10,834

190,559

−0.62

0.03

−0.64

Weathered Tuff

1007

5126

59,963

4119

58,956

142,437

−0.40

0.13

−0.53

Rhyolite

1191

5126

36,735

3935

35,544

165,849

0.27

−0.07

0.35

Colluvial deposit

915

5126

25,804

4211

24,889

176,504

0.37

−0.06

0.43

Weathered Basalt

1751

5126

45,022

3375

43,271

158,122

0.46

−0.18

0.64

Alluvial deposit

52

5126

1910

5074

1858

199,535

0.09

0.00

0.10