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Geoenvironmental Disasters

Table 1 Pair-wise comparison matrix, ratings, and consistency ratio of the variables classes and individual variables used in the present study

From: Modelling terrain erosion susceptibility of logged and regenerated forested region in northern Borneo through the Analytical Hierarchy Process (AHP) and GIS techniques

Variables

Classes

1

2

3

4

5

6

7

8

9

10

Rating / weights

Slope

0–5

1

1/3

1/4

1/5

1/7

1/8

1/9

   

0.0270

5–10

 

1

3/4

3/5

3/7

3/8

3/9

   

0.0810

10–15

  

1

4/5

4/7

4/8

4/9

   

0.1081

15–25

   

1

5/7

5/8

5/9

   

0.1351

25–35

    

1

7/8

7/9

   

0.1891

35–45

     

1

8/9

   

0.2162

> 45

      

1

   

0.2432

Aspect

Flat

1

1/2

1/2

1/3

1/4

1/5

1/7

1/9

1/6

 

0.0256

N

 

1

1

2/3

2/4

2/5

2/7

2/9

2/6

 

0.0512

NE

  

1

2/3

2/4

2/5

2/7

2/9

2/6

 

0.0512

E

   

1

3/4

3/5

3/7

3/9

3/6

 

0.0769

SE

    

1

4/5

4/7

4/9

4/6

 

0.1025

S

     

1

5/7

5/9

5/6

 

0.1282

SW

      

1

7/9

7/6

 

0.1794

W

       

1

9/6

 

0.2307

NW

        

1

 

0.1538

Relative relief

< 100

1

1/3

1/5

1/7

1/9

     

0.04

100–200

 

1

3/5

3/7

3/9

     

0.12

200–300

  

1

5/7

5/9

     

0.2

300–400

   

1

7/9

     

0.28

> 400

    

1

     

0.36

Slope length and Steepness (LS)

5

1

1/3

1/7

1/9

      

0.05

10

 

1

3/7

3/9

      

0.15

15

  

1

7/9

      

0.35

> 15

   

1

      

0.45

Curvature

Concave

1

9

9/7

       

0.5294

Flat

 

1

1/7

       

0.0588

Convex

  

1

       

0.4117

Landforms

Deeply incised stream

1

2/4

2/9

2/1

2/6

2/3

2/5

2/2

2/3

2/7

0.0476

Midslope drainages

 

1

4/9

4/1

4/6

4/3

4/5

4/2

4/3

4/7

0.0952

Upland drainages

  

1

9

9/6

9/3

9/5

9/2

9/3

9/7

0.2142

U shaped valleys

   

1

1/6

1/3

1/5

1/2

1/3

1/7

0.0238

Plains

    

1

6/3

6/5

6/2

6/3

6/7

0.1428

Open slopes

     

1

3/5

3/2

3/3

3/7

0.0714

Upper slopes

      

1

5/2

5/3

5/7

0.1190

Local ridges

       

1

2/3

2/7

0.0476

Midslope ridges

        

1

3/7

0.0714

Mountain tops

         

1

0.1666

Topographic wetness index (TWI)

Low (< 5)

1

1/4

1/9

       

0.0714

Moderate(5–10)

 

1

4/9

       

0.2857

High (> 10)

  

1

       

0.6428

Stream power index (SPI)

< 0

1

1/2

1/3

1/4

1/6

1/8

1/9

   

0.0303

0–1

 

1

2/3

2/4

2/6

2/8

2/9

   

0.0606

1–2

  

1

3/4

3/6

3/8

3/9

   

0.0909

2–3

   

1

4/6

3/8

4/9

   

0.1212

3–4

    

1

6/8

6/9

   

0.1818

4–5

     

1

8/9

   

0.2424

> 5

      

1

   

0.2727

Stream head density

Low (< 15)

1

1/4

1/9

       

0.0714

Medium (15–20)

 

1

4/9

       

0.2857

High > 20

  

1

       

0.6428

Land use/land cover (LULC)

Water

1

1/1

1/8

1/2

1/1

1/2

1/9

1/9

1/1

 

0.0294

Upper montane forest

 

1

1/8

1/2

1/1

1/2

1/9

1/9

1/1

 

0.0294

Secondary forest

  

1

8/2

8/1

8/2

8/9

8/9

8/1

 

0.2359

Primary forest

   

1

2/1

2/2

2/9

2/9

2/1

 

0.0588

Pebble cobble

    

1

1/2

1/9

1/9

1/1

 

0.0294

Paddy

     

1

2/6

2/9

2/1

 

0.0588

Mixed agriculture

      

1

9/9

9/1

 

0.2647

Exposed soil (barren)

       

1

9/1

 

0.2647

Artificial surface

        

1

 

0.0294

Consistency ratio (CR): <  0.0001

Variables(as single unit)

Slope

1

8/1

8/4

8/5

8/3

8/2

8/4

8/7

8/6

8/9

0.1633

Aspect

 

1

1/4

1/5

1/3

1/2

1/4

1/7

1/6

1/9

0.0204

Relative Relief

  

1

4/5

4/3

4/2

4/4

4/7

4/6

4/9

0.0816

Slope length and steepness

   

1

5/3

5/2

5/4

5/7

5/6

5/9

0.1020

Curvature

    

1

3/2

3/4

3/7

3/6

3/9

0.0612

Landform

     

1

2/4

2/7

2/6

2/9

0.0408

TWI

      

1

4/7

4/6

4/9

0.0816

SPI

       

1

7/6

7/9

0.1429

Stream head density

        

1

6/9

0.1224

LULC

         

1

0.1837

Consistency ratio (CR): <  0.00003

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