Variable

Classes

Variable description

Estimate (β)

Std. Error

z value

Pr (>|z|)

Intercept (α)

−5.40

0.15

−36.82

<0.01

Aspect (˚)

2

90 - 180

−0.44

0.03

−12.33

<0.01

3

180 - 270

−0.66

0.04

−17.97

<0.01

4

270 - 360

0.10

0.03

3.10

<0.01

Land Use

2

Permanent crops

−1.71

0.14

−12.26

<0.01

3

Agricoltural areas

−0.66

0.13

−5.08

<0.01

4

Forests

−0.79

0.12

−6.33

<0.01

5

Scrub and/or herbaceous vegetation

−0.30

0.13

−2.42

0.01

6

Open spaces with little or no vegetation

0.20

0.16

−1.31

0.19

DTM (m a.s.l.)

2

700 - 900

−0.85

0.05

−16.73

<0.01

3

900 - 1100

−1.00

0.05

−20.24

<0.01

4

1100 - 1300

−1.66

0.06

−28.91

<0.01

5

1300 - 1500

−2.07

0.07

−29.76

<0.01

6

1500 - 2150

−2.09

0.09

−23.29

<0.01

Slope (˚)

2

5 - 10

1.51

0.09

17.15

<0.01

3

10 - 20

2.26

0.08

28.01

<0.01

4

20 - 30

2.08

0.08

25.33

<0.01

5

30 - 40

2.30

0.09

26.67

<0.01

6

40 - 50

2.98

0.10

29.43

<0.01

7

50 - 75

2.47

0.24

10.34

<0.01

Lithology

2

Quaternary cemented deposits

0.86

0.11

8.14

<0.01

3

Flysch deposits

0.76

0.06

13.46

<0.01

4

Marly limestones

0.86

0.06

15.16

<0.01

5

Marls and clay marls

2.10

0.09

23.62

<0.01

6

Limestones, marls and clays alternations

1.10

0.06

17.21

<0.01

7

Stratified limestone

−0.18

0.06

−3.02

<0.01

8

Dolomite

1.18

0.08

14.05

<0.01